VegeWorx Plant Index - Letter B
- Babassu - Orbignya Barbosiana Burret
- Babeiro - Prestonia Agglutinata (Jacq.) Woodson
- Babington's Graphina Lichen - Graphina Babingtonii (Mont.) Zahlbr.
- Babington's Roccella Lichen - Roccella Babingtonii Mont.
- Baby Blue Eyes - Nemophila Menziesii Hook. & Arn.
- Baby Blue Eyes - Nemophila Menziesii Hook. & Arn. var. atomaria (Fisch. & C.A. Mey.) Chandler
- Baby Blue Eyes - Nemophila Menziesii Hook. & Arn. var. integrifolia Parish
- Baby Blue Eyes - Nemophila Menziesii Hook. & Arn. var. menziesii
- Baby Blue Eyes - Nemophila Nutt.
- Baby Goldenrod - Solidago Nana Nutt.
- Baby Jump-up - Mecardonia Procumbens (Mill.) Small
- Baby Rubberplant - Peperomia Obtusifolia (L.) A. Dietr.
- Baby Sage - Salvia Microphylla Benth.
- Baby's Breath - Gypsophila Paniculata L.
- Baby's-breath - Gypsophila L.
- Babybonnets - Coursetia Dc.
- Babyboot Orchid - Lepanthes Sw.
- Babyslippers - Hybanthus Verticillatus (Ortega) Baill.
- Baccaurea - Baccaurea Lour.
- Baccaurea - Baccaurea Ramiflora Lour.
- Baccaurea Sapida (Roxb.) Müll. Arg.
- Baccharis - Baccharis L.
- Baccharis Concava (Ruiz & Pav.) Pers.
- Baccharis Glutinosa Pers.
- Baccharis Halimifolia L. var. angustior DC.
- Baccharis Pilularis DC. ssp. consanguinea (DC.) C.B. Wolf
- Baccharis Pilularis DC. var. consanguinea (DC.) Kuntze
- Baccharis Viminea DC.
- Baccharisleaf Beardtongue - Penstemon Baccharifolius Hook.
- Bach's Calicoflower - Downingia Bacigalupii Weiler
- Bachang - Mangifera Foetida Lour.
- Bachman's Jelly Lichen - Collema Bachmanianum (Fink) Degel.
- Bachmanniomyces Lichen - Bachmanniomyces D. Hawksw.
- Bachmanniomyces Lichen - Bachmanniomyces Uncialicola (Zopf) D. Hawksw.
- Bacidia Abbrevians (Nyl.) Th. Fr.
- Bacidia Abductans (Nyl.) Zahlbr.
- Bacidia Absistens (Nyl.) Arnold
- Bacidia Accedens (Arnold) Lettau
- Bacidia Acclinis (Flotow) Zahlbr.
- Bacidia Affinis (Stizenb.) Vain.
- Bacidia Aggregatula Malme
- Bacidia Akompsa (Tuck.) Fink
- Bacidia Alaskensis (Nyl.) Zahlbr.
- Bacidia Albescens (Krempelh.) Zwackh
- Bacidia Alpina (Schaerer) Vain.
- Bacidia Aphiahica (Müll. Arg.) Zahlbr.
- Bacidia Arnoldiana Körb.
- Bacidia Arthoniza (Nyl.) Zahlbr.
- Bacidia Assulata (Körb.) Vezda
- Bacidia Atrogrisea (Delise ex Hepp) Körb.
- Bacidia Auerswaldii (Hepp ex Stizenb.) Mig.
- Bacidia Aurantiaca Vezda
- Bacidia Bacillifera (Nyl.) Arnold
- Bacidia Biatorina (Körb.) Vain.
- Bacidia Caloosensis (Tuck.) Zahlbr.
- Bacidia Campalea (Tuck.) S. Ekman & Kalb
- Bacidia Carneoalbida (Müll. Arg.) Coppins
- Bacidia Chlorantha (Tuck.) Fink
- Bacidia Chlorococca (Stenh.) Lettau
- Bacidia Chlorosticta (Tuck.) A. Schneid.
- Bacidia Citrinella (Ach.) Branth & Rostrup
- Bacidia Clementis Hasse
- Bacidia Coprodes (Körb.) Lettau
- Bacidia Cuprea (A. Massal.) Lettau
- Bacidia Cupreorosella (Nyl.) A. Schneid.
- Bacidia Declinis (Tuck.) Zahlbr.
- Bacidia Diffracta S. Ekman
- Bacidia Dryina (Ach.) Fink
- Bacidia Effusa auct.
- Bacidia Egenula (Nyl.) Arnold
- Bacidia Egenuloidea Fink
- Bacidia Endocyanea (Tuck. ex Willey) Zahlbr.
- Bacidia Endoleuca auct.
- Bacidia Epixanthoides (Nyl.) Lettau
- Bacidia Flavovirescens (Dicks.) Anzi
- Bacidia Floridana (Tuck.) Zahlbr.
- Bacidia Friesiana (Hepp) Körb.
- Bacidia Fusca (A. Massal.) Du Rietz
- Bacidia Fuscorubella (Ach.) Bausch
- Bacidia Globulosa (Flörke) Hafellner & V. Wirth
- Bacidia Gyalectiformis Zahlbr.
- Bacidia Gyalizella (Nyl.) Zahlbr.
- Bacidia Hegetschweileri (Hepp) Vain.
- Bacidia Hegetschweileri auct.
- Bacidia Helicospora S. Ekman
- Bacidia Herrei Zahlbr.
- Bacidia Heterochroa (Müll. Arg.) Zahlbr.
- Bacidia Hostheleoides (Nyl.) Zahlbr.
- Bacidia Hyphophila (Turner ex Ach.) Zahlbr.
- Bacidia Idahoensis H. Magn.
- Bacidia Insularis Zahlbr.
- Bacidia Inundata (Fr.) Körb.
- Bacidia Laurocerasi (Delise ex Duby) Zahlbr. ssp. idahoensis (H. Magn.) S. Ekamn
- Bacidia Laurocerasi (Delise ex Duby) Zahlbr. ssp. laurocerasi
- Bacidia Lignaria (Ach.) Lettau
- Bacidia Lugubris (Sommerf.) Zahlbr.
- Bacidia Luteola (Ach.) Mudd
- Bacidia Meadii (Tuck.) Zahlbr.
- Bacidia Melaena (Nyl.) Zahlbr.
- Bacidia Microcarpa (Th. Fr.) Lettau
- Bacidia Microphyllina auct.
- Bacidia Minuscula Anzi
- Bacidia Molybditis (Tuck.) Zahlbr.
- Bacidia Muscorum (Sw.) Mudd
- Bacidia Mutabilis Malme
- Bacidia Naegelii (Hepp) Zahlbr.
- Bacidia Obscurata (Sommerf.) Zahlbr.
- Bacidia Phacodes auct.
- Bacidia Populorum (A. Massal.) Trevis.
- Bacidia Reagens Malme
- Bacidia Rubricosa (Müll. Arg.) Zahlbr.
- Bacidia Russeola (Kempelh.) Zahlbr.
- Bacidia Sabuletorum (Schreb.) Lettau
- Bacidia Salmonea S. Ekman
- Bacidia Sphaeroides (Dicks.) Zahlbr.
- Bacidia Sphaeroides auct.
- Bacidia Stigmatella (Tuck.) Zahlbr.
- Bacidia Subfuscula (Nyl.) Th. Fr.
- Bacidia Subgranulosa (Tuck.) Riddle
- Bacidia Tetramera (De Not.) Coppins
- Bacidia Trisepta (Hellbom) Zahlbr.
- Bacidia Umbrina (Ach.) Bausch
- Bacidia Vermifera (Nyl.) Fr.
- Bacidina Aenea S. Ekman
- Bacidina Apiahica (Müll. Arg.) Vezda
- Bacidina Arnoldiana (Körb.) Wirth & Vezda
- Bacidina Assulata (Körb.) S. Ekman
- Bacidina Californica S. Ekman
- Bacidina Chloroticula (Nyl.) Vezda & Poelt
- Bacidina Crystallifera S. Ekman
- Bacidina Egenula (Nyl.) Vezda
- Bacidina Egenuloidea (Fink) S. Ekman
- Bacidina Inundata (Fr.) Vezda
- Bacidina Phacodes (Körb.) Vezda
- Bacidina Ramea S. Ekman
- Bacidina Squamellosa S. Ekman
- Bacidina Varia S. Ekman
- Bacidina Vezda
- Back's Sedge - Carex Backii Boott
- Backhous Fuchsia - Correa Backhousiana Hook.
- Bacopa Acuminata (Walter) B.L. Rob.
- Bacopa Acuminata (Walter) B.L. Rob. var. microphylla (Raf.) Fernald
- Bacopa Cyclophylla Fernald
- Bacopa Nobsiana H. Mason
- Bacopa Simulans Fernald
- Bacopa Stragula Fernald
- Bactris Acanthophylla Mart.
- Bactris Palm - Bactris Jacq. ex Scop.
- Bactrospora Brevispora R.C. Harris
- Bactrospora Brodoi Egea & Torrente
- Bactrospora Clementis (Hasse) ?, ined.?
- Bactrospora Denticulata (Vain.) Egea & Torrente
- Bactrospora Integrispora Seaver
- Bactrospora Lichen - Bactrospora A. Massal.
- Bactrospora Lichen - Bactrospora Dryina (Ach.) A. Massal.
- Bactrospora Lichen - Bactrospora Patellarioides (Nyl.) Vain.
- Bactrospora Macrospora R.C. Harris
- Bactrospora Mesospora R.C. Harris
- Bactrospora Myriadea (Fée) Egea & Torrente
- Bactrospora Nematospora R.C. Harris
- Bactrospora Spiralis Egea & Torrente
- Bacury - Platonia Esculenta (Arruda) Rickett & Stafleu
- Baden's Bluegrass - Poa Badensis Haenke ex Willd.
- Badiera Portoricensis Britton
- Badlands Mule-ears - Scabrethia Scabra (Hook.) W.A. Weber
- Badlands Mule-ears - Scabrethia Scabra (Hook.) W.A. Weber ssp. attenuata (W.A. Weber) W.A. Weber
- Badlands Mule-ears - Scabrethia Scabra (Hook.) W.A. Weber ssp. canescens (W.A. Weber) W.A. Weber
- Badlands Mule-ears - Scabrethia Scabra (Hook.) W.A. Weber ssp. scabra
- Badusa A. Gray
- Baeckea - Baeckea Frutescens L.
- Baeckea - Baeckea L.
- Baeomyces Absolutus Tuck.
- Baeomyces Fungoides (Sw.) Ach.
- Baeomyces Roseus Pers.
- Baeothryon Alpinum (L.) Egor.
- Baeothryon Caespitosum (L.) A. Dietr., orth. var.
- Baeothryon Cespitosum (L.) A. Dietr.
- Baeothryon Clementis (M.E. Jones) Á. Löve & D. Löve
- Baeothryon Clintonii (A. Gray) Á. Löve & D. Löve
- Baeothryon Pumilum (Vahl) Á. Löve & D. Löve
- Baeothryon Verecundum (Fernald) Á. Löve & D. Löve
- Baeria Bakeri J.T. Howell
- Baeria Californica (Hook.) K.L. Chambers
- Baeria Chrysostoma Fisch. & C.A. Mey.
- Baeria Chrysostoma Fisch. & C.A. Mey. ssp. gracilis (DC.) Ferris
- Baeria Chrysostoma Fisch. & C.A. Mey. ssp. hirsutula (Greene) Ferris
- Baeria Chrysostoma Fisch. & C.A. Mey. var. gracilis (DC.) H.M. Hall
- Baeria Debilis Greene ex A. Gray
- Baeria Fremontii (Torr. ex A. Gray) A. Gray
- Baeria Fremontii (Torr. ex A. Gray) A. Gray var. conjugens (Greene) Ferris
- Baeria Fremontii (Torr. ex A. Gray) A. Gray var. heterochaeta Hoover
- Baeria Hirsutula (Greene) Greene
- Baeria Leptalea (A. Gray) A. Gray
- Baeria Macrantha (A. Gray) A. Gray
- Baeria Macrantha (A. Gray) A. Gray var. bakeri (J.T. Howell) D.D. Keck
- Baeria Macrantha (A. Gray) A. Gray var. pauciaristata A. Gray
- Baeria Macrantha (A. Gray) A. Gray var. thalassophila J.T. Howell
- Baeria Maritima A. Gray
- Baeria Microglossa (DC.) Greene
- Baeria Minor (DC.) Ferris
- Baeria Minor (DC.) Ferris ssp. maritima (A. Gray) Ferris
- Baeria Platycarpha (A. Gray) A. Gray
- Baeria Uliginosa (Nutt.) A. Gray
- Baffin Fescue - Festuca Baffinensis Polunin
- Baffin Lecidea Lichen - Lecidea Baffiniana H. Magn.
- Bagflower - Clerodendrum Thompsoniae Balf. f.
- Bagflower - Clerodendrum Thomsoniae Balf.
- Baglietto'a Dotted Lichen - Bacidia Bagliettoana (A. Massal. & De Not.) Jatta
- Bagpod - Sesbania Vesicaria (Jacq.) Elliott
- Bahama Baybean - Canavalia Nitida (Cav.) Piper
- Bahama Beaksedge - Rhynchospora Lindeniana Griseb.
- Bahama Beaksedge - Rhynchospora Lindeniana Griseb. var. bahamensis (Britton) Gale
- Bahama Brake - Pteris Bahamensis (J. Agardh) Fée
- Bahama Fimbry - Fimbristylis Inaguensis Britton
- Bahama Maidenbush - Savia Bahamensis Britton
- Bahama Manjack - Cordia Bahamensis Urb.
- Bahama Nightshade - Solanum Bahamense L.
- Bahama Nightshade - Solanum Bahamense L. var. bahamense
- Bahama Nightshade - Solanum Bahamense L. var. luxurians D'Arcy
- Bahama Pigeonplum - Coccoloba Tenuifolia L.
- Bahama Sachsia - Sachsia Polycephala Griseb.
- Bahama Wild Coffee - Psychotria Ligustrifolia (Northrop) Millsp.
- Bahaman Aster - Symphyotrichum Bahamense (Britton) G.L. Nesom
- Bahia - Bahia Lag.
- Bahia Lovegrass - Eragrostis Bahiensis Schrad. ex Schult.
- Bahia Neomexicana (A. Gray) A. Gray
- Bahia Nudicaulis A. Gray
- Bahia Nudicaulis A. Gray var. desertorum (M.E. Jones) Cronquist
- Bahia Nudicaulis A. Gray var. oblongifolia (A. Gray) Cronquist
- Bahia Nudicaulis A. Gray var. ourolepis (S.F. Blake) Cronquist
- Bahia Oblongifolia (A. Gray) A. Gray
- Bahia Oppositifolia (Nutt.) A. Gray
- Bahia Ourolepis S.F. Blake
- Bahia Piassaba Palm - Attalea Funifera Mart. ex Spreng.
- Bahia - Picradeniopsis Rydb. ex Britton
- Bahia Woodhousei (A. Gray) A. Gray
- Bahiagrass - Paspalum Notatum Flueggé
- Bahiagrass - Paspalum Notatum Flueggé var. latiflorum J. Döll
- Bahiagrass - Paspalum Notatum Flueggé var. notatum
- Bahiagrass - Paspalum Notatum Flueggé var. saurae Parodi
- Baikal Sedge - Carex Sabulosa Turcz. ex Kunth
- Bailey's Beard Lichen - Usnea Baileyi (Stirt.) Zahlbr.
- Bailey's Buckwheat - Eriogonum Baileyi S. Watson
- Bailey's Buckwheat - Eriogonum Baileyi S. Watson var. baileyi
- Bailey's Buckwheat - Eriogonum Baileyi S. Watson var. praebens (Gandog.) Reveal
- Bailey's Dewberry - Rubus Baileyanus Britton
- Bailey's Greasewood - Sarcobatus Baileyi Coville
- Bailey's Hedgehog Cactus - Echinocereus Reichenbachii (Terscheck ex Walp.) hort ex Haage ssp. baileyi (Rose) N.P. Tayl
- Bailey's Ivesia - Ivesia Baileyi S. Watson
- Bailey's Ivesia - Ivesia Baileyi S. Watson var. baileyi
- Bailey's Ivesia - Ivesia Baileyi S. Watson var. beneolens (A. Nelson & J.F. Macbr.) Ertter
- Bailey's Ivesia - Ivesia Baileyi S. Watson var. setosa S. Watson
- Bailey's Pseudoleskea Moss - Pseudoleskea Baileyi Best & Grout
- Bailey's Rabbitbrush - Chrysothamnus Baileyi Wooton & Standl.
- Bailey's Sedge - Carex Baileyi Britton
- Baileya Multiradiata Harv. & A. Gray ex A. Gray var. pleniradiata (Harv. & A. Gray ex
- Baileya Multiradiata Harv. & A. Gray ex A. Gray var. thurberi (Rydb.) Kittell
- Baileya Perennis (A. Nelson) Rydb.
- Baillonella - Baillonella Pierre
- Baja Birdbush - Ornithostaphylos Oppositifolia (Parry) Small
- Baja Buckwheat - Eriogonum Foliosum S. Watson
- Baja California Ipomopsis - Ipomopsis Effusa (A. Gray) Moran
- Baja Desert-thorn - Lycium Brevipes Benth.
- Baja Pincushionplant - Navarretia Peninsularis Greene
- Baja Rose - Rosa Minutifolia Engelm.
- Bajada Lupine - Lupinus Concinnus J. Agardh
- Bajada Lupine - Lupinus Concinnus J. Agardh ssp. concinnus
- Bajada Lupine - Lupinus Concinnus J. Agardh ssp. optatus (C.P. Sm.) D. Dunn
- Bajalily - Triteleiopsis Hoover
- Baker's Alpineparsley - Oreoxis Bakeri J.M. Coult. & Rose
- Baker's Crowngrass - Paspalum Bakeri Hook.
- Baker's Cryptantha - Cryptantha Bakeri (Greene) Payson
- Baker's Delphinium - Delphinium Bakeri Ewan
- Baker's Goldfields - Lasthenia Californica DC. ex Lindl. ssp. bakeri (J.T. Howell) R. Chan
- Baker's Hawksbeard - Crepis Bakeri Greene
- Baker's Hawksbeard - Crepis Bakeri Greene ssp. bakeri
- Baker's Lupine - Lupinus Bakeri Greene
- Baker's Lupine - Lupinus Bakeri Greene ssp. amplus (Greene) Fleak & D. Dunn
- Baker's Lupine - Lupinus Bakeri Greene ssp. bakeri
- Baker's Manzanita - Arctostaphylos Bakeri Eastw.
- Baker's Manzanita - Arctostaphylos Bakeri Eastw. ssp. bakeri
- Baker's Meadowfoam - Limnanthes Bakeri J.T. Howell
- Baker's Navarretia - Navarretia Leucocephala Benth. ssp. bakeri (H. Mason) Day
- Baker's Paperflower - Psilostrophe Bakeri Greene
- Baker's Phacelia - Phacelia Bakeri (Brand) J.F. Macbr.
- Baker's Pritchardia - Pritchardia Bakeri Hodel
- Baker's Stickyseed - Blennosperma Bakeri Heiser
- Baker's Violet - Viola Bakeri Greene
- Baker's Wheatgrass - Elymus Bakeri (E.E. Nelson) Á. Löve
- Baker's Wild Hollyhock - Iliamna Bakeri (Jeps.) Wiggins
- Bakong - Pandanus Dubius Spreng. [excluded]
- Balanites Aegyptiaca (L.) Delile, orth. var.
- Balanites - Balanites Delile
- Balanophora Fungosa J.R. Forst. & G. Forst.
- Balanophora Indica (Arn.) Griff.
- Balanophora J.r. Forst. & G. Forst.
- Balansa Clover - Trifolium Michelianum Savi ssp. balansae (Boiss.) Ponert
- Balbis' Maiden Fern - Thelypteris Balbisii (Spreng.) Ching
- Balbis' Milkvine - Matelea Balbisii (Decne.) Woodson
- Bald Bedstraw - Galium Orizabense Hemsl.
- Bald Bedstraw - Galium Orizabense Hemsl. ssp. laevicaule (Weath. & S.F. Blake) Dempster
- Bald Brome - Bromus Racemosus L.
- Bald Cypress - Taxodium Distichum (L.) Rich.
- Bald Cypress - Taxodium Rich.
- Bald Fleabane - Erigeron Calvus Coville
- Bald Mountain Milkvetch - Astragalus Umbraticus Sheldon
- Bald Spikerush - Eleocharis Erythropoda Steud.
- Baldhead False Buttonweed - Spermacoce Capitata Ruiz & Pav.
- Baldwin Lake Linanthus - Linanthus Killipii H. Mason
- Baldwin's Beaksedge - Rhynchospora Baldwinii A. Gray
- Baldwin's Dwarf Polypody - Grammitis Baldwinii (Baker) Copeland
- Baldwin's Eryngo - Eryngium Baldwinii Spreng.
- Baldwin's Flatsedge - Cyperus Croceus Vahl
- Baldwin's Ironweed - Vernonia Baldwinii Torr.
- Baldwin's Ironweed - Vernonia Baldwinii Torr. ssp. baldwinii
- Baldwin's Milkvine - Matelea Baldwyniana (Sweet) Woodson
- Baldwin's Milkwort - Polygala Balduinii Nutt.
- Baldwin's Nailwort - Paronychia Baldwinii (Torr. & A. Gray) Fenzl ex Walp.
- Baldwin's Nailwort - Paronychia Baldwinii (Torr. & A. Gray) Fenzl ex Walp. ssp. baldwinii
- Baldwin's Nailwort - Paronychia Baldwinii (Torr. & A. Gray) Fenzl ex Walp. ssp. riparia (Chapm.) Chaudhri
- Baldwin's Nutrush - Scleria Baldwinii (Torr.) Steud.
- Baldwin's Spikerush - Eleocharis Baldwinii (Torr.) Chapm.
- Baldwin's Yelloweyed Grass - Xyris Baldwiniana Schult.
- Balfour's Touch-me-not - Impatiens Balfourii Hook. f.
- Balkan Catchfly - Silene Csereii Baumg.
- Balkan Pincushions - Scabiosa Palaestrina L.
- Balkan Pine - Pinus Peuce Griseb.
- Ball Draba - Draba Sphaeroides Payson
- Ball Lichen - Sphaerophorus Pers.
- Ball Saltbush - Atriplex Fruticulosa Jeps.
- Ball's Willow - Salix Ballii Dorn
- Ballast Eryngo - Eryngium Divaricatum Hook. & Arn.
- Ballast Toadflax - Linaria Spartea (L.) Chaz.
- Ballhead Ipomopsis - Ipomopsis Congesta (Hook.) V.E. Grant
- Ballhead Ipomopsis - Ipomopsis Congesta (Hook.) V.E. Grant ssp. congesta
- Ballhead Ipomopsis - Ipomopsis Congesta (Hook.) V.E. Grant ssp. crebrifolia (Nutt.) Day
- Ballhead Ipomopsis - Ipomopsis Congesta (Hook.) V.E. Grant ssp. frutescens (Rydb.) Day
- Ballhead Ipomopsis - Ipomopsis Congesta (Hook.) V.E. Grant ssp. montana (A. Nelson & Kennedy) V.E. Grant
- Ballhead Ipomopsis - Ipomopsis Congesta (Hook.) V.E. Grant ssp. nevadensis (Tidestr.) Kartesz & Gandhi
- Ballhead Ipomopsis - Ipomopsis Congesta (Hook.) V.E. Grant ssp. palmifrons (Brand) Day
- Ballhead Ipomopsis - Ipomopsis Congesta (Hook.) V.E. Grant ssp. pseudotypica (Constance & Rollins) Day
- Ballhead Ipomopsis - Ipomopsis Congesta (Hook.) V.E. Grant ssp. viridis (Cronquist) Day
- Ballhead Pore Lichen - Pertusaria Globularis (Ach.) Tuck.
- Ballhead Ragwort - Senecio Sphaerocephalus Greene
- Ballhead Sandwort - Arenaria Congesta Nutt.
- Ballhead Sandwort - Arenaria Congesta Nutt. var. congesta
- Ballhead Sandwort - Arenaria Congesta Nutt. var. crassula Maguire
- Ballhead Sandwort - Arenaria Congesta Nutt. var. prolifera Maguire
- Ballhead Sandwort - Arenaria Congesta Nutt. var. simulans Maguire
- Ballhead Waterleaf - Hydrophyllum Capitatum Douglas ex Benth.
- Ballhead Waterleaf - Hydrophyllum Capitatum Douglas ex Benth. var. capitatum
- Ballmustard - Calepina Adans.
- Ballmustard - Neslia Paniculata (L.) Desv.
- Ballona Cinquefoil - Potentilla Multijuga Lehm.
- Balloon Sack Clover - Trifolium Depauperatum Desv. var. amplectens (Torr. & A. Gray) S. Watson
- Balloon Sack Clover - Trifolium Depauperatum Desv. var. diversifolium (Nutt.) McDermott
- Balloon Sack Clover - Trifolium Depauperatum Desv. var. stenophyllum (Nutt.) McDermott
- Balloon Vine - Cardiospermum Halicacabum L.
- Balloon-flower - Platycodon Grandiflorus (Jacq.) A. DC.
- Balloonbush - Epixiphium Wislizeni (Engelm. ex A. Gray) Munz
- Balloonplant - Asclepias Physocarpa (E. Mey.) Schltr.
- Balloonpod Milkvetch - Astragalus Whitneyi A. Gray
- Balloonpod Milkvetch - Astragalus Whitneyi A. Gray var. lenophyllus (Rydb.) Barneby
- Balloonpod Milkvetch - Astragalus Whitneyi A. Gray var. sonneanus (Greene) Jeps.
- Balloonpod Milkvetch - Astragalus Whitneyi A. Gray var. whitneyi
- Balloonvine - Cardiospermum L.
- Ballota Borealis Schweigg.
- Ballota Nigra L. ssp. foetida Hayek
- Ballou's Melicope - Melicope Balloui (Rock) T.G. Hartley & B.C. Stone
- Balm - Dicerandra Benth.
- Balm - Dicerandra ×thinicola H.A. Mill. (pro sp.)
- Balm - Melissa L.
- Balm-of-gilead - Populus ×jackii Sarg.
- Balsam Apple - Echinopepon Naud.
- Balsam Bird's-foot Trefoil - Lotus Stipularis (Benth.) Greene
- Balsam Bird's-foot Trefoil - Lotus Stipularis (Benth.) Greene var. stipularis
- Balsam Fir - Abies Balsamea (L.) Mill.
- Balsam Fir - Abies Balsamea (L.) Mill. var. balsamea
- Balsam Fir - Abies Balsamea (L.) Mill. var. phanerolepis Fernald
- Balsam Groundsel - Packera Paupercula (Michx.) Á. Löve & D. Löve
- Balsam Of Peru - Myroxylon Balsamum (L.) Harms var. pereirae (Royle) Harms
- Balsam Of Tolu - Myroxylon Balsamum (L.) Harms
- Balsam Of Tolu - Myroxylon Balsamum (L.) Harms var. balsamum
- Balsam Poplar - Populus Balsamifera L.
- Balsam Poplar - Populus Balsamifera L. ssp. balsamifera
- Balsam Torchwood - Amyris Balsamifera L.
- Balsam Tree - Colophospermum Mopane (Kirk ex Benth.) Kirk ex J. Léonard
- Balsam Willow - Salix Pyrifolia Andersson
- Balsam-leaf Calycera - Calycera Balsamitifolia A. Rich.
- Balsamillo - Hamelia Axillaris Sw.
- Balsamita Major Desf.
- Balsamita Major Desf. var. tanacetoides (Boiss.) Moldenke
- Balsamo - Bulnesia Sarmienti Lorentz ex Griseb.
- Balsamorhiza Bolanderi A. Gray
- Balsamorhiza Hirsuta Nutt.
- Balsamorhiza Hirsuta Nutt. var. lagocephala Sharp
- Balsamorhiza Hirsuta Nutt. var. neglecta Sharp
- Balsamorhiza Hispidula Sharp
- Balsamorhiza Hookeri (Hook.) Nutt. var. lanata Sharp
- Balsamorhiza Hookeri (Hook.) Nutt. var. platylepis (Sharp) Cronquist
- Balsamorhiza Macrophylla Nutt. var. idahoensis Sharp
- Balsamorhiza Platylepis Sharp
- Balsampear - Momordica Charantia L.
- Balsampear - Momordica Cochinchinensis (Lour.) Spreng.
- Balsampear - Momordica Dioica Roxb. ex Willd.
- Balsamroot - Balsamorhiza Nutt.
- Balsamroot - Balsamorhiza ×bonseri H. St. John (pro sp.)
- Balsamroot - Balsamorhiza ×terebinthacea (Hook.) Nutt. (pro sp.)
- Balsamroot - Balsamorhiza ×tomentosa Rydb. (pro sp.)
- Balsamscale Grass - Elionurus Humb. & Bonpl. ex Willd.
- Baltic Saltbush - Atriplex Nudicaulis Boguslaw
- Baltic Sphagnum - Sphagnum Balticum (Russow) C.E.O. Jensen
- Baltimora - Baltimora L.
- Baltimore Flavoparmelia Lichen - Flavoparmelia Baltimorensis (Gyel. & Foriss) Hale
- Baltzell's Sedge - Carex Baltzellii Chapm. ex Dewey
- Bambarra Groundnut - Vigna Subterranea (L.) Verdc.
- Bamberger's Hypnum Moss - Hypnum Bambergeri Schimp.
- Bamboo - Bambusa Arundinacea (Retz.) Willd.
- Bamboo - Bambusa Longispiculata Gamble ex Brandis
- Bamboo - Bambusa Schreb.
- Bamboo - Bambusa Tulda Roxb.
- Bamboo Muhly - Muhlenbergia Dumosa Scribn. ex Vasey
- Bamboo Orchid - Arundina Blume
- Bamboo Orchid - Arundina Graminifolia (D. Don) Hochr.
- Bamboo Palm - Rhapis Excelsa (Thunb.) A. Henry ex Rehder
- Bamboo - Phyllostachys Siebold & Zucc.
- Bamboo Vine - Smilax Pseudochina L.
- Bamboo-leaf - Lophatherum Gracile Brongn.
- Bambusa Atra Lindl.
- Bambusa Bambos (L.) Voss [excluded]
- Bambusa Blumeana Schult. f.
- Bambusa Glaucescens (Willd.) Siebold ex Munro
- Bambusa Nana Roxb.
- Bambusa Oldhamii W. Munro [excluded]
- Bambusa Pygmaea Miq.
- Banana - Musa Balbisiana Colla
- Banana - Musa L.
- Banana Passionflower - Passiflora Tarminiana Coppens & V.E. Barney
- Banana Passionflower - Passiflora Tripartita (Juss.) Poir. var. mollissima (Kunth) Holm-Niesen & P.M. Jørg.
- Banana Poka - Passiflora Tripartita (Juss.) Poir.
- Banana Shrub - Michelia Figo (Lour.) Spreng.
- Banana Yucca - Yucca Baccata Torr.
- Bandanna Daisy - Gaillardia Coahuilensis B.L. Turner
- Bandanna Of The Everglades - Canna Flaccida Salisb.
- Banded Trinity - Thismia Americana N.E. Pfeiffer
- Bandicoot-berry - Leea Indica (Burm. f.) Merr.
- Baneberry - Actaea L.
- Baneberry - Actaea ×ludovici B. Boivin
- Banff Bluegrass - Poa Laxa Haenke ssp. banffiana Soreng
- Bangeraruchel - Dendrobium Brachyanthum Schltr.
- Bangikoi - Dalbergia Hosokawae Costion
- Banisteria Diversifolia Kunth
- Banisteria Emarginata Cav.
- Banisteria Floribunda DC.
- Banisteria Laurifolia L.
- Banisteria Lucida Rich.
- Banisteria Lupuloides L.
- Banisteria Ovata Cav.
- Banisteria Pubera Rich.
- Banisteria Purpurea L.
- Banisteria Wydleriana (A. Juss.) C.B. Rob.
- Banisteriopsis - Banisteriopsis C.b. Rob. ex Small
- Banisteriopsis Inebrians Morton
- Banisteriopsis Quitensis (Niedz.) Morton
- Bank Catclaw - Acacia Redolens Maslin
- Banksia - Banksia L. f., nom. cons.
- Bao Li - Quercus Serrata Thunb.
- Baobab - Adansonia Digitata L.
- Baphia - Baphia Lodd.
- Baptisia Bracteata Muhl. ex Elliott var. glabrescens (Larisey) Isely
- Baptisia Bushii auct. non Small
- Baptisia Cuneata Small
- Baptisia Elliptica Small
- Baptisia Elliptica Small var. tomentosa Larisey
- Baptisia Fragilis Larisey
- Baptisia Gibbesii Small
- Baptisia Hirsuta Small
- Baptisia Intercalata Larisey
- Baptisia Lactea (Raf.) Thieret
- Baptisia Lactea (Raf.) Thieret var. obovata (Larisey) Isely
- Baptisia Laevicaulis (A. Gray ex Canby) Small
- Baptisia Leucantha Torr. & A. Gray
- Baptisia Leucantha Torr. & A. Gray var. divaricata Larisey
- Baptisia Leucantha Torr. & A. Gray var. pauciflora Larisey
- Baptisia Leucophaea Nutt.
- Baptisia Leucophaea Nutt. var. glabrescens Larisey
- Baptisia Leucophaea Nutt. var. laevicaulis A. Gray ex Canby
- Baptisia Macilenta Small ex Larisey
- Baptisia Minor Lehm.
- Baptisia Minor Lehm. var. aberrans Larisey
- Baptisia Pendula Larisey
- Baptisia Pendula Larisey var. macrophylla Larisey
- Baptisia Pendula Larisey var. obovata Larisey
- Baptisia Psammophila Larisey
- Baptisia Riparia Larisey
- Baptisia Riparia Larisey var. minima Larisey
- Baptisia Texana Buckley
- Baptisia Tinctoria (L.) R. Br. var. crebra Fernald
- Baptisia Tinctoria (L.) R. Br. var. projecta Fernald
- Baptisia Vespertina Small ex Rydb.
- Baptisia Villosa auct. non (Walter) Nutt.
- Baptisia Viridis Larisey
- Baptisia ×deamii Larisey
- Baptisia ×intermedia Larisey
- Baptisia ×pinetorum Larisey
- Baptisia ×stricta Larisey
- Barbados Aloe - Aloe Vera (L.) Burm. f.
- Barbados Cherry - Malpighia Emarginata Sessé & Moc. ex DC.
- Barbados Lily - Hippeastrum Puniceum (Lam.) Kuntze
- Barbados Nut - Jatropha Curcas L.
- Barbados Shrub - Pereskia Aculeata Mill.
- Barbara's Buttons - Marshallia Schreb.
- Barbarea Americana Rydb.
- Barbarea Arcuata (Opiz ex J. Presl & C. Presl) Rchb.
- Barbarea Orthoceras Ledeb. var. dolichocarpa Fernald
- Barbarea Praecox (Sm.) R. Br.
- Barbarea Stricta auct. non Andrz.
- Barbarea Vulgaris W.T. Aiton var. arcuata (Opiz ex J. Presl & C. Presl) Fr.
- Barbarea Vulgaris W.T. Aiton var. brachycarpa Rouy & Foucaud
- Barbarea Vulgaris W.T. Aiton var. longisiliquosa Carion
- Barbarea Vulgaris W.T. Aiton var. sylvestris Fr.
- Barbary Fig - Opuntia Ficus-indica (L.) Mill.
- Barbas De Indio - Andropogon Bicornis L.
- Barbasco - Lonchocarpus Nicou (Aubl.) DC.
- Barbasco - Lonchocarpus Urucu Killip & A.C. Sm.
- Barbed Bristlegrass - Setaria Verticilliformis Dunart.
- Barbed Goatgrass - Aegilops Triuncialis L.
- Barbed Rattlesnakeroot - Prenanthes Barbata (Torr. & A. Gray) Milstead
- Barbedbristle Bulrush - Scirpus Ancistrochaetus Schuyler
- Barbella Moss - Barbella Fleisch.
- Barber's Hawksbeard - Crepis Runcinata (James) Torr. & A. Gray ssp. barberi (Greenm.) Babc. & Stebbins
- Barberry - Berberis L.
- Barberry - Berberis ×ottawensis C.K. Schneid.
- Barberry Hawthorn - Crataegus Berberifolia Torr. & A. Gray
- Barberry - Mahonia Nutt.
- Barberton Daisy - Gerbera Jamesonii Bolus ex Hook. f.
- Barbgrass - Hainardia Cylindrica (Willd.) Greuter
- Barbgrass - Hainardia Greuter
- Barbieria - Barbieria Dc.
- Barbilophozia Atlantica (Kaal.) Müll. Frib.
- Barbilophozia Attenuata (Mart.) Loeske
- Barbilophozia Barbata (Schmid. ex Schreb.) Loeske
- Barbilophozia Binsteadii (Kaal.) Loeske
- Barbilophozia Cavifolia (H. Buch & S.W. Arnell) Stotler & Stotl.-Crand.
- Barbilophozia Floerkei (F. Weber & D. Mohr) Loeske
- Barbilophozia Hatcheri (A. Evans) Loeske
- Barbilophozia Hyperborea (R.M. Schust.) Stotler & Stotl.-Crand. ex Potemk.
- Barbilophozia Kunzeana (Huebener) Gams
- Barbilophozia Loeske
- Barbilophozia Lycopodioides (Wallr.) Loeske
- Barbilophozia Quadriloba (Lindb.) Loeske
- Barbilophozia Quadriloba (Lindb.) Loeske var. collenchymatica (R.M. Schust.) Stotler & St
- Barbilophozia Quadriloba (Lindb.) Loeske var. glareosa (Jörg.) Stotler & Stotl.-Crand.
- Barbilophozia Quadriloba (Lindb.) Loeske var. quadriloba
- Barbilophozia Rubescens (R.M. Schust. & Damsh.) Kartt. & L. Söderstr.
- Barbula Acuta (Brid.) Brid.
- Barbula Acuta (Brid.) Brid. ssp. icmadophila (Schimp. ex Müll. Hal.) Amann
- Barbula Acuta (Brid.) Brid. var. bescherellei (Sauerb.) H.A. Crum
- Barbula Acuta (Brid.) Brid. var. icmadophila (Schimp. ex Müll. Hal.) H.A. Crum
- Barbula Andreaeoides Kindb.
- Barbula Asperifolia Mitt.
- Barbula Aurea (E.B. Bartram) R.H. Zander
- Barbula Bescherellei Sauerb.
- Barbula Brachyphyllus Sull.
- Barbula Cancellata Müll. Hal.
- Barbula Chloronotos (Brid.) Brid.
- Barbula Columbiana (F.J. Herm. & E. Lawton) E. Lawton & F.J. Herm.
- Barbula Convoluta Hedw. var. obtusata Müll. Hal. & Kindb.
- Barbula Cruegeri Sond. ex Müll. Hal.
- Barbula Cylindrica (Taylor) Schimp.
- Barbula Fallax Hedw.
- Barbula Fallax Hedw. var. recurvifolia (Wilson) Husn.
- Barbula Ferruginascens Stirt.
- Barbula Haringae H.A. Crum
- Barbula Icmadophila Schimp. ex Müll. Hal.
- Barbula Inaequalifolia (Taylor) R.H. Zander
- Barbula Johansenii R.S. Williams
- Barbula Maxima Syed & Crundw.
- Barbula Michiganensis Steere
- Barbula Moss - Barbula Agraria Hedw.
- Barbula Moss - Barbula Amplexifolia (Mitt.) A. Jaeger
- Barbula Moss - Barbula Coreensis (Cardot) K. Saito
- Barbula Moss - Barbula Eustegia Cardot & Thér.
- Barbula Moss - Barbula Hedw.
- Barbula Moss - Barbula Indica (Hook.) Spreng.
- Barbula Moss - Barbula Indica (Hook.) Spreng. var. gregaria (Mitt.) R.H. Zander
- Barbula Moss - Barbula Indica (Hook.) Spreng. var. indica
- Barbula Moss - Barbula Unguiculata Hedw.
- Barbula Nigrescens Mitt.
- Barbula Perobtusa (Broth.) Chen
- Barbula Platyneura Müll. Hal. & Kindb.
- Barbula Reflexa (Brid.) Brid.
- Barbula Rigidula Schimp. ex C. Mll. var. icmadophila Schimp. ex Müll. Hal., nom.
- Barbula Rubiginosa Mitt.
- Barbula Rufofusca E. Lawton & F.J. Herm.
- Barbula Spiralis Schimp.
- Barbula Subandreaeoides Kindb.
- Barbula Subgracilis Müll. Hal. & Kindb.
- Barbula Unguiculata Hedw. f. apiculata (Hedw.) Mönk.
- Barbula Unguiculata Hedw. f. propagulosa H.A. Crum
- Barbula Vinealis Brid.
- Barbula Vinealis Brid. var. flaccida Bruch & Schimp.
- Barbula Whitehouseae H.A. Crum
- Barbwire Grass - Cymbopogon Refractus (R. Br.) A. Camus
- Barbwire Russian Thistle - Salsola Paulsenii Litv.
- Barclay's Willow - Salix Barclayi Andersson
- Bare Monkeyflower - Mimulus Nudatus Curran ex Greene
- Barefoot Panicgrass - Panicum Psilopodium Trin.
- Barestem Biscuitroot - Lomatium Nudicaule (Pursh) J.M. Coult. & Rose
- Barestem Teesdalia - Teesdalia Nudicaulis (L.) W.T. Aiton
- Baretwig Neststraw - Stylocline Psilocarphoides M. Peck
- Bariaco - Trichilia Triacantha Urb.
- Barkplant - Vriesea Sintenisii (Baker) L.B. Sm. & Pittendr.
- Barleria Coccinea L.
- Barleria Solanifolia L.
- Barleriola - Barleriola Oerst.
- Barley - Hordeum L.
- Barley Mitchell Grass - Astrebla Pectinata (Lindl.) F. Muell. [excluded]
- Barley - ×elyhordeum Mansf. ex Zizin & Petrowa
- Barn Vetch - Vicia Monantha Retz.
- Barnacle Lichen - Thelotrema Abrosellum (Nyl.) Tuck.
- Barnacle Lichen - Thelotrema Ach.
- Barnacle Lichen - Thelotrema Adjectum Nyl.
- Barnacle Lichen - Thelotrema Lacteum Krempelh.
- Barnacle Lichen - Thelotrema Lathraeum Tuck.
- Barnacle Lichen - Thelotrema Lepadinum (Ach.) Ach.
- Barnacle Lichen - Thelotrema Leprocarpum (Nyl.) Tuck.
- Barnacle Lichen - Thelotrema Platycarpum Tuck.
- Barnacle Lichen - Thelotrema Santense Tuck.
- Barnacle Lichen - Thelotrema Subtile Tuck.
- Barneby's Clover - Trifolium Barnebyi (Isely) Dorn & Lichvar
- Barneby's Indian Paintbrush - Castilleja Scabrida Eastw. var. barnebyana (Eastw.) N.H. Holmgren
- Barneby's Locoweed - Oxytropis Arctica R. Br. var. barnebyana S.L. Welsh
- Barneby's Pepperweed - Lepidium Barnebyanum Reveal
- Barneby's Phacelia - Phacelia Barnebyana J.T. Howell
- Barneby's Serpentweed - Tonestus Kingii (D.C. Eaton) G.L. Nesom var. barnebyana (S.L. Welsh & Goodrich)
- Barneby's Thistle - Cirsium Barnebyi S.L. Welsh & Neese
- Barnes' Eurhynchium Moss - Eurhynchium Pulchellum (Hedw.) Jenn. var. barnesii (Renauld & Cardot) Grout
- Barnyardgrass - Echinochloa Crus-galli (L.) P. Beauv.
- Barometerbush - Leucophyllum Bonpl.
- Barosma Betulina (Bergius) Bartling & Wendl. f.
- Barosma Crenulata (L.) Hook.
- Barosma Serratifolia (Curtis) Willd.
- Barr's Milkvetch - Astragalus Barrii Barneby
- Barranca Brush - Ceanothus Verrucosus Nutt.
- Barratt's Sedge - Carex Barrattii Schwein. & Torr.
- Barratt's Willow - Salix Barrattiana Hook.
- Barrel Cactus - Ferocactus Britton & Rose
- Barrelclover - Medicago Truncatula Gaertn.
- Barrelier's Bugloss - Anchusa Barrelieri (All.) Vitman
- Barrelier's Woodsorrel - Oxalis Barrelieri L.
- Barren Ground Willow - Salix Nummularia Andersson
- Barren Milkvetch - Astragalus Cusickii A. Gray var. sterilis (Barneby) Barneby
- Barren Strawberry - Waldsteinia Willd.
- Barren Valley Collomia - Collomia Renacta E. Joyal
- Barren Willow - Salix Jejuna Fernald
- Barrenground Willow - Salix Niphoclada Rydb.
- Barrens Silky Aster - Symphyotrichum Pratense (Raf.) G.L. Nesom
- Barreta - Helietta Parvifolia (A. Gray ex Hemsl.) Benth.
- Barrett's Beardtongue - Penstemon Barrettiae A. Gray
- Barrier Range Wattle - Acacia Beckleri Tindale
- Barringtonia - Barringtonia J.r. Forst. & G. Forst.
- Barringtonia Racemosa Roxb.
- Barringtonia Samoensis A. Gray
- Barrio Charcas Maiden Fern - Thelypteris Verecunda Proctor
- Barron's Wild Buckwheat - Eriogonum Spectabile B.L. Corbin, Reveal & R. Barron
- Barth's Rice - Oryza Barthii A. Chev.
- Bartlett Daisy - Bartlettia Scaposa A. Gray
- Bartlett's Sphagnum - Sphagnum Bartlettianum Warnst.
- Bartlettia - Bartlettia A. Gray
- Bartlettina - Bartlettina R.m. King & H. Rob.
- Bartlettina Sordida (Less.) R.M. King & H. Rob.
- Bartleya Ohioensis H. Rob.
- Barton Flats Horkelia - Horkelia Wilderae Parish
- Barton's Raspberry - Rubus Bartonianus M. Peck
- Bartonia Iodandra B.L. Rob.
- Bartonia Lanceolata Small
- Bartonia Paniculata (Michx.) Muhl. var. intermedia Fernald
- Bartonia Paniculata (Michx.) Muhl. var. iodandra (B.L. Rob.) Fernald
- Bartonia Paniculata (Michx.) Muhl. var. sabulonensis (Fernald) Fernald
- Bartonia Virginica (L.) Britton, Sterns & Poggenb. var. paniculata (Michx.) B. Boiv
- Bartonia Virginica (L.) Britton, Sterns & Poggenb. var. sabulonensis (Fernald) B. B
- Bartram Oak - Quercus ×heterophylla Michx. f. (pro sp.)
- Bartram's Airplant - Tillandsia Bartramii Elliott
- Bartram's Ixia - Calydorea Coelestina (W. Bartram) Goldblatt & Henrich
- Bartram's Orthotrichum Moss - Orthotrichum Bartramii R.S. Williams
- Bartram's Rose Gentian - Sabatia Bartramii Wilbur
- Bartram's Tortula Moss - Tortula Bartramii Steere
- Bartramia Breviseta Lindb.
- Bartramia Circinnulata Müll. Hal. & Kindb.
- Bartramia Crispa Brid.
- Bartramia Glauco-viridis Müll. Hal. & Kindb.
- Bartramia Ithyphylla Brid. var. breviseta (Lindb.) Kindb.
- Bartramia Ithyphylla Brid. var. fragilifolia Cardot & Thér.
- Bartramia Ithyphylla Brid. var. strigosa (Wahlenb.) Hartm.
- Bartramia Moss - Bartramia Glauca Lor.
- Bartramia Moss - Bartramia Hedw.
- Bartramia Moss - Bartramia Ithyphylla Brid.
- Bartramia Moss - Bartramia Microstoma Mitt.
- Bartramia Moss - Bartramia Pomiformis Hedw.
- Bartramia Moss - Bartramia Stricta Brid.
- Bartramia Moss - Bartramia Subulata Bruch & Schimp.
- Bartramia Oederi Brid.
- Bartramia Pomiformis Hedw. var. crispa (Brid.) Bruch & Schimp.
- Bartramia Pomiformis Hedw. var. elongata Turner
- Bartramia Viridissima (Brid.) Kindb.
- Bartramidula Carolinae Sharp
- Bartramidula Cernua Lindb.
- Bartramidula Moss - Bartramidula Bruch & Schimp.
- Bartramiopsis Moss - Bartramiopsis Kindb.
- Bartsia Trixago L.
- Barundi Dropseed - Sporobolus Piliferus (Trin.) Kunth
- Barwood - Pterocarpus Erinaceus Poir.
- Barwood - Pterocarpus Soyauxii Taubert
- Basalt Desert Buckwheat - Eriogonum Codium Reveal, Caplow & K. Beck
- Basalt Fleabane - Erigeron Basalticus Hoover
- Basalt Larkspur - Delphinium Basalticum Warnock
- Basalt Milkvetch - Astragalus Filipes Torr. ex A. Gray
- Basalt Springparsley - Cymopterus Basalticus M.E. Jones
- Basella - Basella L.
- Basella Rubra L.
- Basella Vesicaria Lam.
- Bashful Bulrush - Trichophorum Planifolium (Spreng.) Palla
- Bashful Four O'clock - Mirabilis Pudica Barneby
- Bashful Four O'clock - Mirabilis Pudica Barneby var. pubescens Kartesz & Gandhi
- Bashful Four O'clock - Mirabilis Pudica Barneby var. pudica
- Bashful Ragwort - Senecio Pudicus Greene
- Bashful Wakerobin - Trillium Catesbaei Elliott
- Basil Beebalm - Monarda Clinopodioides A. Gray
- Basil Mountainmint - Pycnanthemum Clinopodioides Torr. & A. Gray
- Basil - Ocimum L.
- Basil Thyme - Acinos Arvensis (Lam.) Dandy
- Basin Bellflower - Campanula Reverchonii A. Gray
- Basin Big Sagebrush - Artemisia Tridentata Nutt. ssp. tridentata
- Basin Bladderpod - Lesquerella Cinerea S. Watson
- Basin Cryptantha - Cryptantha Ambigua (A. Gray) Greene
- Basin Fleabane - Erigeron Pulcherrimus A. Heller
- Basin Nemophila - Nemophila Breviflora A. Gray
- Basin Saltbush - Atriplex Tridentata Kuntze
- Basin Wildrye - Leymus Cinereus (Scribn. & Merr.) Á. Löve
- Basin Yellow Cryptantha - Cryptantha Confertiflora (Greene) Payson
- Basindaisy - Platyschkuhria Integrifolia (A. Gray) Rydb.
- Basindaisy - Platyschkuhria Integrifolia (A. Gray) Rydb. var. integrifolia
- Basindaisy - Platyschkuhria Integrifolia (A. Gray) Rydb. var. ourolepis (S.F. Blake) W. Ellison
- Basindaisy - Platyschkuhria Rydb.
- Basiphyllaea Angustifolia Schltr.
- Basiphyllaea - Basiphyllaea Schltr.
- Basistelma Angustifolia (Torr.) Bartlett, non CynanG.L. Chum angustifolium Pers.
- Basket Fern - Drynaria (bory) J. Sm.
- Basket Fern - Drynaria Quercifolia (L.) J. Sm.
- Basket Of Gold - Aurinia Saxatilis (L.) Desv.
- Basket Rush - Juncus Textilis Buchenau
- Basket Willow - Salix Viminalis L.
- Basketgrass - Oplismenus Hirtellus (L.) P. Beauv.
- Basketgrass - Oplismenus Hirtellus (L.) P. Beauv. ssp. hirtellus
- Basketgrass - Oplismenus Hirtellus (L.) P. Beauv. ssp. imbecillis (R. Br.) U. Scholz
- Basketgrass - Oplismenus Hirtellus (L.) P. Beauv. ssp. setarius (Lam.) Mez ex Ekman
- Basketgrass - Oplismenus Hirtellus (L.) P. Beauv. ssp. undulatifolius (Ard.) U. Scholz
- Basketgrass - Oplismenus P. Beauv.
- Basketplant - Callisia Fragrans (Lindl.) Woodson
- Basketwood - Serjania Polyphylla (L.) Radlk.
- Basora - Cordia Angustifolia (West ex Willd.) Roem. & Schult.
- Bassia Butyracea Roxb.
- Bassia Iranica (Bornm.) Bornm. [excluded]
- Bassia Latifolia Roxb.
- Bassia Longifolia J. Konig
- Bassia Sieversiana (Pall.) W.A. Weber
- Basswood - Tilia L.
- Bastard Briziletto - Weinmannia Pinnata L.
- Bastard Cherry - Malpighia Linearis Jacq.
- Bastard Copperleaf - Acalypha Chamaedryfolia (Lam.) Müll. Arg.
- Bastard Draba Milkvetch - Astragalus Drabelliformis Barneby
- Bastard Gregre - Ginoria Rohrii (Vahl) Koehne
- Bastard Hogberry - Margaritaria Nobilis L. f.
- Bastard Milkvetch - Astragalus Tegetarioides M.E. Jones
- Bastard Mulga - Acacia Stowardii Maiden
- Bastard Oak - Quercus Sinuata Walter
- Bastard Oak - Quercus Sinuata Walter var. breviloba (Torr.) C.H. Mull.
- Bastard Oak - Quercus Sinuata Walter var. sinuata
- Bastard Redwood - Chrysophyllum Argenteum Jacq.
- Bastard Speedwell - Pseudolysimachion Spurium (L.) Rauschert
- Bastard Stopper - Petitia Domingensis Jacq.
- Bastard Toadflax - Comandra Nutt.
- Bastard Toadflax - Comandra Umbellata (L.) Nutt.
- Bastard Toadflax - Comandra Umbellata (L.) Nutt. ssp. umbellata
- Bastard White Oak - Quercus Austrina Small
- Bastardcabbage - Rapistrum Crantz
- Bastardcedar - Guazuma Ulmifolia Lam.
- Bastardia - Bastardia Kunth
- Bastardsage - Eriogonum Wrightii Torr. ex Benth.
- Bastardsage - Eriogonum Wrightii Torr. ex Benth. var. membranaceum S. Stokes ex Jeps.
- Bastardsage - Eriogonum Wrightii Torr. ex Benth. var. nodosum (Small) Reveal
- Bastardsage - Eriogonum Wrightii Torr. ex Benth. var. subscaposum S. Watson
- Bastardsage - Eriogonum Wrightii Torr. ex Benth. var. trachygonum (Torr. ex Benth.) Jeps.
- Bastardsage - Eriogonum Wrightii Torr. ex Benth. var. wrightii
- Bataprine Hispidula (Michx.) Nieuwl.
- Bataprine Uniflora (Michx.) Nieuwl.
- Bateman's Buckwheat - Eriogonum Batemanii M.E. Jones
- Batesburg Hawthorn - Crataegus Munda Beadle
- Batflower - Tacca Leontopetaloides (L.) Kuntze
- Bathelium Ach.
- Bathelium Carolinianum (Tuck.) R.C. Harris
- Bathelium Madreporiforme (Eschw.) Trevis.
- Batidophaca Lotiflorus (Hook.) Rydb.
- Batocydia Unguis-cati (L.) Mart. ex Britton
- Batodendron Andrachniforme Small
- Batodendron Arboreum (Marshall) Nutt.
- Batoko Plum - Flacourtia Inermis Roxb.
- Baton Rouge Blackberry - Rubus Exeter L.H. Bailey
- Batrachium Aquatile (L.) Dumort.
- Batrachium Circinatum (Sibth.) Rchb.
- Batrachium Circinatum (Sibth.) Rchb. ssp. subrigidum (W. Drew) Á. Löve & D. Löve
- Batrachium Confervoides Fr.
- Batrachium Flaccidum (Pers.) Rupr.
- Batrachium Hederaceum (L.) Gray
- Batrachium Longirostre (Godr.) F.W. Schultz
- Batrachium Porteri (Britton) Britton
- Batrachium Trichophyllum (Chaix) F.W. Schultz
- Bats In The Belfry - Campanula Trachelium L.
- Batschia Canescens Michx.
- Batschia Caroliniensis Walter ex J.F. Gmel.
- Batschia Linearifolia (Goldie) Small
- Batwing Fern - Histiopteris Incisa (Thunb.) J. Sm.
- Bauer's Anacolia Moss - Anacolia Menziesii (Turner) Par. var. baueri (Hampe) Flow.
- Bauer's Bristle Fern - Trichomanes Bauerianum Endl.
- Bauhinia Aculeata L.
- Bauhinia - Bauhinia Binata Blanco
- Bauhinia - Bauhinia Fassoglensis Kotschy ex Schweinf.
- Bauhinia - Bauhinia L.
- Bauhinia - Bauhinia ×blakeana S.T. Dunn
- Bauhinia Congesta (Britton & Rose) Lundell
- Bauhinia Diphylla Buch.-Ham.
- Bauhinia Divaricata L. [excluded]
- Bauhinia Jermyana (Britton) Lundell
- Bauhinia Macrantha Benth. ex Hemsl. [excluded]
- Bauhinia Macrantha Benth. ex Hemsl. var. grayana Wunderlin
- Bauhinia Megalandra Griseb.
- Bauhinia Petersiana Bolle
- Bauhinia Petersiana Bolle ssp. serpae (Ficalho & Hiern) Brummitt & J.H. Ross
- Bauhinia Punctata Bolle, non Jacq.
- Bauhinia Ungulata L. [excluded]
- Bausch's Dot Lichen - Micarea Bauschiana (Körb.) V. Wirth & Vezda
- Bavarian Timmia Moss - Timmia Megapolitana Hedw. var. bavarica (Hessl.) Brid.
- Bay Biscayne Creeping-oxeye - Sphagneticola Trilobata (L.) Pruski
- Bay Cedar - Suriana Maritima L.
- Bay County Indian Plantain - Arnoglossum Album L.C. Anderson
- Bay Forget-me-not - Myosotis Laxa Lehm.
- Bay Lobelia - Lobelia Feayana A. Gray
- Bay - Persea Mill.
- Bay Starvine - Schisandra Glabra (E.P. Bicknell) Rehder
- Bayamon - Hyptis Escobilla Urb.
- Bayamon Stopper - Eugenia Laevis Berg
- Bayard's Adder's-mouth Orchid - Malaxis Bayardii Fernald
- Baybean - Canavalia Rosea (Sw.) DC.
- Bayberry - Morella Lour.
- Bayberry - Morella ×macfarlanei (Youngken) Kartesz
- Bayberry Willow - Salix Myricoides Muhl.
- Bayberry Willow - Salix Myricoides Muhl. var. albovestita (C.R. Ball) Dorn
- Bayberry Willow - Salix Myricoides Muhl. var. myricoides
- Bayhops - Ipomoea Pes-caprae (L.) R. Br.
- Bayhops - Ipomoea Pes-caprae (L.) R. Br. ssp. pes-caprae (L.) R. Br. [excluded]
- Bayonet Rush - Juncus Militaris Bigelow
- Bayrumtree - Pimenta Racemosa (Mill.) J.W. Moore
- Bayrumtree - Pimenta Racemosa (Mill.) J.W. Moore var. grisea (Kiaersk.) Fosberg
- Bayrumtree - Pimenta Racemosa (Mill.) J.W. Moore var. racemosa
- Bazzania A. Gray, nom. cons.
- Bazzania Ambigua (Lindenb.) Trevis.
- Bazzania Denudata (Torr. ex Gottsche & Lindenb. & Nees) Trevis.
- Bazzania Nudicaulis A. Evans
- Bazzania Pearsonii Steph.
- Bazzania Tricrenata (Wahlenb.) Lindb.
- Bazzania Trilobata (L.) A. Gray
- Bazzania Trilobata (L.) A. Gray var. depauperata (Müll. Frib.) Grolle
- Bazzania Trilobata (L.) A. Gray var. trilobata
- Be Still Tree - Rauvolfia Tetraphylla L.
- Beach Clustervine - Jacquemontia Reclinata House
- Beach Creeping Oxeye - Pascalia Glauca Ortega
- Beach Evening Primrose - Oenothera Drummondii Hook.
- Beach False Foxglove - Agalinis Fasciculata (Elliott) Raf.
- Beach Knotweed - Polygonum Paronychia Cham. & Schltdl.
- Beach Milkvine - Matelea Maritima (Jacq.) Woodson
- Beach Moonflower - Ipomoea Violacea L.
- Beach Morning-glory - Ipomoea Imperati (Vahl) Griseb.
- Beach Naupaka - Scaevola Sericea Vahl
- Beach Naupaka - Scaevola Sericea Vahl var. sericea
- Beach Naupaka - Scaevola Sericea Vahl var. taccada (Gaertn.) Thieret & B. Lipscomb
- Beach Pea - Lathyrus Japonicus Willd.
- Beach Pea - Lathyrus Japonicus Willd. var. japonicus
- Beach Pea - Lathyrus Japonicus Willd. var. maritimus (L.) Kartesz & Gandhi
- Beach Pea - Lathyrus Japonicus Willd. var. pellitus Fernald
- Beach Pine - Pinus Contorta Douglas ex Loudon var. contorta
- Beach Pinweed - Lechea Maritima Leggett ex Britton, Sterns & Poggenb.
- Beach Pinweed - Lechea Maritima Leggett ex Britton, Sterns & Poggenb. var. maritima
- Beach Plum - Prunus Maritima Marshall
- Beach Plum - Prunus Maritima Marshall var. maritima
- Beach Saltbush - Atriplex Leucophylla (Moq.) D. Dietr.
- Beach Sand Verbena - Abronia Neurophylla Standl.
- Beach Sandmat - Chamaesyce Degeneri (Sherff) Croizat & O. Deg.
- Beach Sedge - Carex Silicea Olney
- Beach Seepweed - Suaeda Conferta (Small) I.M. Johnst.
- Beach Sensitive Pea - Chamaecrista Chamaecristoides (Collad.) Greene
- Beach Sensitive Pea - Chamaecrista Chamaecristoides (Collad.) Greene var. cruziana (Britton & Rose) Irwin & Barneby
- Beach Sheoak - Casuarina Equisetifolia L.
- Beach Shieldpod - Dithyrea Maritima (Davidson) Davidson
- Beach Spiderlily - Hymenocallis Littoralis (Jacq.) Salisb.
- Beach Starwort - Stellaria Littoralis Torr.
- Beach Strawberry - Fragaria Chiloensis (L.) Mill.
- Beach Strawberry - Fragaria Chiloensis (L.) Mill. ssp. chiloensis (L.) Mill. [excluded]
- Beach Strawberry - Fragaria Chiloensis (L.) Mill. ssp. lucida (Vilm.) Staudt
- Beach Suncup - Camissonia Cheiranthifolia (Hornem. ex Spreng.) Raimann
- Beach Suncup - Camissonia Cheiranthifolia (Hornem. ex Spreng.) Raimann ssp. cheiranthifolia
- Beach Suncup - Camissonia Cheiranthifolia (Hornem. ex Spreng.) Raimann ssp. suffruticosa (S. Watson) P.H.
- Beach Tidytips - Layia Carnosa (Nutt.) Torr. & A. Gray
- Beach Wormwood - Artemisia Pycnocephala (Less.) DC.
- Beachgrass - Ammophila Host
- Beachhead Iris - Iris Setosa Pall. ex Link
- Beachhead Iris - Iris Setosa Pall. ex Link var. setosa
- Beachstar - Remirea Aubl.
- Beachstar - Remirea Maritima Aubl.
- Beaded Lipfern - Cheilanthes Wootonii Maxon
- Beadfern - Hypolepis Bernh.
- Beadle Oak - Quercus ×beadlei Trel. ex Palmer
- Beadle's Hawthorn - Crataegus Beadlei Ashe
- Beadle's Mountainmint - Pycnanthemum Beadlei (Small) Fernald
- Beadlea Bicolor (Ker Gawl.) Garay
- Beadlea Cranichoides (Griseb.) Small
- Beadlea Elata (Sw.) Small
- Beadtree - Adenanthera L.
- Beaked Agrimony - Agrimonia Rostellata Wallr.
- Beaked Clarkia - Clarkia Rostrata W.S. Davis
- Beaked Cornsalad - Valerianella Radiata (L.) Dufr.
- Beaked Dodder - Cuscuta Rostrata Shuttlw. ex Engelm. & A. Gray
- Beaked Hawksbeard - Crepis Vesicaria L.
- Beaked Hawksbeard - Crepis Vesicaria L. ssp. taraxacifolia (Thuill.) Thell.
- Beaked Hazelnut - Corylus Cornuta Marshall
- Beaked Hazelnut - Corylus Cornuta Marshall var. cornuta
- Beaked Mock Vervain - Glandularia Quandrangulata (A. Heller) Umber
- Beaked Panicgrass - Panicum Anceps Michx.
- Beaked Pincushion Tree - Hakea Rostrata F. Muell.
- Beaked Sedge - Carex Rostrata Stokes
- Beaked Skeletonweed - Shinnersoseris Rostrata (A. Gray) S. Tomb
- Beaked Skeletonweed - Shinnersoseris S. Tomb
- Beaked Snailfern - Cochlidium Rostratum (Hook.) Maxon ex C. Chr.
- Beaked Spikerush - Eleocharis Rostellata (Torr.) Torr.
- Beaked Spiny Polygala - Polygala Heterorhyncha (Barneby) T. Wendt
- Beakgrain - Diarrhena P. Beauv.
- Beaksedge - Rhynchospora Vahl
- Beale's Barberry - Mahonia Bealei (Fortune) Carrière
- Bean Broomrape - Orobanche Crenata Forssk. [excluded]
- Bean - Phaseolus L.
- Beancaper - Zygophyllum L.
- Bear Garlic - Allium Ursinum L.
- Bear Huckleberry - Gaylussacia Ursina (M.A. Curtis) Torr. & A. Gray ex A. Gray
- Bear Mountain Milkweed - Asclepias Scaposa Vail
- Bear Oak - Quercus Ilicifolia Wangenh.
- Bear River Fleabane - Erigeron Ursinus D.C. Eaton
- Bear Sedge - Carex Ursina Dewey
- Bear Tupelo - Nyssa Ursina Small
- Bear Valley Buckwheat - Eriogonum Ursinum S. Watson
- Bear Valley Buckwheat - Eriogonum Ursinum S. Watson var. ursinum
- Bear Valley Milkvetch - Astragalus Leucolobus S. Watson ex M.E. Jones
- Bear Valley Sandwort - Arenaria Ursina B.L. Rob.
- Bear's Breech - Acanthus Mollis L.
- Bearberry Willow - Salix Uva-ursi Pursh
- Bearbrush - Garrya Fremontii Torr.
- Beard Lichen - Usnea Aculeata Mot.
- Beard Lichen - Usnea Affinis Mot.
- Beard Lichen - Usnea Amabilis Mot.
- Beard Lichen - Usnea Angulata Ach.
- Beard Lichen - Usnea Australis Fr.
- Beard Lichen - Usnea Capillaris Mot.
- Beard Lichen - Usnea Catenulata Mot.
- Beard Lichen - Usnea Ceratina Ach.
- Beard Lichen - Usnea Ciliifera Mot.
- Beard Lichen - Usnea Cirrosa Mot.
- Beard Lichen - Usnea Cornuta Körb.
- Beard Lichen - Usnea Dill. ex Adans.
- Beard Lichen - Usnea Dimorpha (Müll. Arg.) Mot.
- Beard Lichen - Usnea Diplotypus Vain.
- Beard Lichen - Usnea Duriuscula Mot.
- Beard Lichen - Usnea Endochrysea Stirt.
- Beard Lichen - Usnea Erinacea Vain.
- Beard Lichen - Usnea Fibrillosa Mot.
- Beard Lichen - Usnea Filipendula Stirt.
- Beard Lichen - Usnea Fulvoreagens (Rasanen) Rasanen
- Beard Lichen - Usnea Furfurosula (Zahlbr.) Mot.
- Beard Lichen - Usnea Glabrata (Ach.) Vain.
- Beard Lichen - Usnea Glabrescens (Nyl. ex Vain.) Vain.
- Beard Lichen - Usnea Graciosa Mot.
- Beard Lichen - Usnea Hesperina Mot.
- Beard Lichen - Usnea Hirta (L.) F.H. Wigg.
- Beard Lichen - Usnea Leucosticta Vain.
- Beard Lichen - Usnea Longissima Ach.
- Beard Lichen - Usnea Longissima Ach. var. corticata R. Howe
- Beard Lichen - Usnea Mirabilis Mot.
- Beard Lichen - Usnea Monstruosa Vain.
- Beard Lichen - Usnea Mutabilis Stirt.
- Beard Lichen - Usnea Pachyclada Mot.
- Beard Lichen - Usnea Ramillosa Mot.
- Beard Lichen - Usnea Retifera Mot.
- Beard Lichen - Usnea Roseola Vain.
- Beard Lichen - Usnea Rubicunda Stirt.
- Beard Lichen - Usnea Sacbiosa Mot.
- Beard Lichen - Usnea Scabrata Nyl.
- Beard Lichen - Usnea Sphacelata R. Br.
- Beard Lichen - Usnea Stuppea (Rasanen) Mot.
- Beard Lichen - Usnea Subfloridana Stirt.
- Beard Lichen - Usnea Subfusca Stirt.
- Beard Lichen - Usnea Subhirta Mot.
- Beard Lichen - Usnea Subscabrosa Mot.
- Beard Lichen - Usnea Substerilis Mot.
- Beard Lichen - Usnea Sylvatica Mot.
- Beard Lichen - Usnea Trichodea Ach.
- Beard Lichen - Usnea Tristis Mot.
- Beard Lichen - Usnea Vainioi Mot.
- Beard Lichen - Usnea Xanthopoga Nyl.
- Bearded Beggarticks - Bidens Aristosa (Michx.) Britton
- Bearded Cinquefoil - Potentilla Crinita A. Gray
- Bearded Cinquefoil - Potentilla Crinita A. Gray var. crinita
- Bearded Clover - Trifolium Barbigerum Torr.
- Bearded Clover - Trifolium Barbigerum Torr. var. barbigerum
- Bearded Cryptantha - Cryptantha Barbigera (A. Gray) Greene
- Bearded Cupgrass - Eriochloa Aristata Vasey
- Bearded Fescue - Festuca Subulata Trin.
- Bearded Flatsedge - Cyperus Squarrosus L.
- Bearded Grasspink - Calopogon Barbatus (Walter) Ames
- Bearded Jewelflower - Streptanthus Barbiger Greene
- Bearded Lupine - Lupinus Barbiger S. Watson
- Bearded Melicgrass - Melica Aristata Thurb. ex Bol.
- Bearded Milkvetch - Astragalus Villosus Michx.
- Bearded Monkeyflower - Mimulus Barbatus Greene
- Bearded Popcornflower - Plagiobothrys Hystriculus (Piper) I.M. Johnst.
- Bearded Prairie Clover - Dalea Pogonathera A. Gray
- Bearded Prairie Clover - Dalea Pogonathera A. Gray var. pogonathera
- Bearded Shorthusk - Brachyelytrum Erectum (Schreb. ex Spreng.) P. Beauv.
- Bearded Skeletongrass - Gymnopogon Ambiguus (Michx.) Britton, Sterns & Poggenb.
- Bearded Sprangletop - Leptochloa Fusca (L.) Kunth ssp. fascicularis (Lam.) N. Snow
- Bearded Swallow-wort - Cynanchum Barbigerum (Scheele) Shinners
- Bearded Wheatgrass - Elymus Caninus (L.) L.
- Beardgrass - Bothriochloa Kuntze
- Beardless Chinchweed - Pectis Imberbis A. Gray
- Beardless Rabbitsfoot Grass - Polypogon Imberbis (Phil.) Johow
- Beardless Rabbitsfoot Grass - Polypogon Viridis (Gouan) Breistr.
- Beardless Wheatgrass - Pseudoroegneria Spicata (Pursh) Á. Löve ssp. inermis (Scribn. & J.G. Sm.) Á. Löve
- Beardless Wildrye - Leymus Triticoides (Buckley) Pilg.
- Beardlip Penstemon - Penstemon Barbatus (Cav.) Roth
- Beardlip Penstemon - Penstemon Barbatus (Cav.) Roth ssp. barbatus
- Beardlip Penstemon - Penstemon Barbatus (Cav.) Roth ssp. trichander (A. Gray) D.D. Keck
- Beardtongue - Penstemon Schmidel
- Beardtongue - Penstemon ×dubius Davidson (pro sp.)
- Beardtongue - Penstemon ×jonesii Pennell (pro sp.)
- Beardtongue - Penstemon ×mirus A. Nelson (pro sp.)
- Beardtongue - Penstemon ×parishii A. Gray (pro sp.)
- Beardtongue - Penstemon ×peirsonii Munz & I.M. Johnst. (pro sp.)
- Beargrass - Nolina Michx.
- Beargrass - Xerophyllum Michx.
- Bearpoppy - Arctomecon Torr. & Frém.
- Beath's Milkvetch - Astragalus Beathii Ced. Porter
- Beatley's Buckwheat - Eriogonum Rosense A. Nelson & Kennedy var. beatleyae (Reveal) Reveal
- Beatley's Clover - Trifolium Andersonii A. Gray ssp. beatleyae J.M. Gillett
- Beatley's Milkvetch - Astragalus Beatleyae Barneby
- Beatley's Phacelia - Phacelia Beatleyae Reveal & Constance
- Beaumont Oak - Quercus ×beaumontiana Sarg.
- Beaumont's Cup Lichen - Cladonia Beaumontii (Tuck.) Vain.
- Beautiful Alumroot - Heuchera Cylindrica Douglas ex Hook. var. glabella (Torr. & A. Gray) Wheelock
- Beautiful Aster - Eurybia Glauca (Nutt.) G.L. Nesom var. pulchra (S.F. Blake) Brouillet
- Beautiful Bladderpod - Lesquerella Pulchella Rollins
- Beautiful Bluebells - Mertensia Bella Piper
- Beautiful Cinquefoil - Potentilla Pulcherrima Lehm.
- Beautiful Fleabane - Erigeron Formosissimus Greene
- Beautiful Hawthorn - Crataegus Pulcherrima Ashe
- Beautiful Indian Paintbrush - Castilleja Pulchella Rydb.
- Beautiful Phacelia - Phacelia Pulchella A. Gray
- Beautiful Phacelia - Phacelia Pulchella A. Gray var. pulchella
- Beautiful Phacelia - Phacelia Pulchella A. Gray var. sabulonum J.T. Howell
- Beautiful Rockcress - Arabis Pulchra M.E. Jones ex S. Watson
- Beautiful Rockcress - Arabis Pulchra M.E. Jones ex S. Watson var. gracilis M.E. Jones
- Beautiful Rockcress - Arabis Pulchra M.E. Jones ex S. Watson var. pallens M.E. Jones
- Beautiful Rockcress - Arabis Pulchra M.E. Jones ex S. Watson var. pulchra
- Beautiful Sandwort - Minuartia Rubella (Wahlenb.) Hiern.
- Beautiful Spikerush - Eleocharis Bella (Piper) Svens.
- Beautiful Woolly Sunflower - Eriophyllum Ambiguum (A. Gray) A. Gray
- Beautiful Woolly Sunflower - Eriophyllum Ambiguum (A. Gray) A. Gray var. ambiguum
- Beautiful Woolly Sunflower - Eriophyllum Ambiguum (A. Gray) A. Gray var. paleaceum (Brandegee) Ferris
- Beautyberry - Callicarpa Elegans Hayek
- Beautyberry - Callicarpa L.
- Beautybush - Kolkwitzia Amabilis Graebn.
- Beautyhead - Baltimora Recta L.
- Beauverd Spirea - Spiraea Stevenii (C.K. Schneid.) Rydb.
- Beauverd's Widow's-thrill - Kalanchoe Beauverdii Hamlet
- Beauvois' Spotted Felt Lichen - Sticta Beauvoisii Delise
- Beaver Indian Breadroot - Pediomelum Castoreum (S. Watson) Rydb.
- Beaver Mountain Ragwort - Packera Castoreus (S.L. Welsh) Kartesz
- Beaver Povertyweed - Monolepis Spathulata A. Gray
- Beavertail Grass - Calochortus Coeruleus (Kellogg) S. Watson
- Beavertail Pricklypear - Opuntia Basilaris Engelm. & J.M. Bigelow
- Beavertail Pricklypear - Opuntia Basilaris Engelm. & J.M. Bigelow var. basilaris
- Beavertail Pricklypear - Opuntia Basilaris Engelm. & J.M. Bigelow var. brachyclada (Griffiths) Munz
- Beavertail Pricklypear - Opuntia Basilaris Engelm. & J.M. Bigelow var. longiareolata (Clover & Jotter) L.D.
- Beavertip Draba - Draba Globosa Payson
- Bebb Willow - Salix Bebbiana Sarg.
- Bebb's Sedge - Carex Bebbii Olney ex Fernald
- Beccari's Dalbergia - Dalbergia Beccarii Prain
- Beck's Leafcup - Polymnia Johnbeckii D. Estes
- Beck's Water-marigold - Bidens Beckii Torr. ex Spreng.
- Beckett's Water Trumpet - Cryptocoryne Beckettii Thwaites ex Trimen.
- Beckhaus' Dotted Lichen - Bacidia Beckhausii Körb.
- Beckmannia Eruciformis (L.) Host ssp. baicalensis (Kusnez.) Hultén
- Beckmannia Eruciformis (L.) Host var. uniflora Scribn. ex A. Gray
- Beckmannia Eruciformis auct. non (L.) Host
- Beckmannia Syzigachne (Steud.) Fernald ssp. baicalensis (Kusnez.) Koyama & Kawano
- Beckmannia Syzigachne (Steud.) Fernald var. uniflora (Scribn. ex A. Gray) B. Boivin
- Beckwith's Clover - Trifolium Beckwithii W.H. Brewer ex S. Watson
- Beckwith's Milkvetch - Astragalus Beckwithii Torr. & A. Gray
- Beckwith's Milkvetch - Astragalus Beckwithii Torr. & A. Gray var. beckwithii
- Beckwith's Milkvetch - Astragalus Beckwithii Torr. & A. Gray var. purpureus M.E. Jones
- Beckwith's Milkvetch - Astragalus Beckwithii Torr. & A. Gray var. sulcatus Barneby
- Beckwith's Rockcress - Arabis Beckwithii S. Watson
- Beckwith's Violet - Viola Beckwithii Torr. & A. Gray
- Beckwith's Violet - Viola Beckwithii Torr. & A. Gray ssp. beckwithii
- Beckwithia Andersonii (A. Gray) Jeps.
- Beckwithia Glacialis (L.) Á. Löve & D. Löve
- Beckwithia Glacialis (L.) Á. Löve & D. Löve ssp. chamissonis (Schltdl.) Á. Löve & D.
- Bedding Conehead - Strobilanthes Anisophylla (G. Lodd.) T. Anderson f. isophylla (Nees) J.R.I. Wood
- Bedford Springs Hawthorn - Crataegus Ignave Beadle
- Bedgrass - Ichnanthus P. Beauv.
- Bedstraw - Cruciata Mill.
- Bedstraw - Galium L.
- Bedstraw - Galium ×pomeranicum Retz.
- Bedstraw St. Johnswort - Hypericum Galioides Lam.
- Bee Orchid - Lycaste Barringtoniae (Sm.) Lindl.
- Bee Wattle - Vachellia Sphaerocephala (Cham. & Schltdl.) Seigler & Ebinger
- Bee-bee Tree - Tetradium Daniellii (Benn.) T.G. Hartley
- Beebalm - Monarda L.
- Beebalm - Monarda Stipitatoglandulosa Waterf.
- Beebalm - Monarda ×medioides Duncan
- Beebrush - Aloysia Juss.
- Beech - Fagus L.
- Beechdrops - Epifagus Nutt.
- Beechdrops - Epifagus Virginiana (L.) W.P.C. Barton
- Beechey's Bamboo - Bambusa Beecheyana Munro
- Beechfern - Phegopteris Fée
- Beechleaf Croton - Croton Betulinus Vahl
- Beechleaf Frangula - Frangula Betulifolia (Greene) V. Grub.
- Beechleaf Frangula - Frangula Betulifolia (Greene) V. Grub. ssp. betulifolia
- Beefsteakplant - Perilla Frutescens (L.) Britton
- Beefsteakplant - Perilla Frutescens (L.) Britton var. crispa (Benth.) Deane
- Beefsteakplant - Perilla Frutescens (L.) Britton var. frutescens
- Beeftree - Guapira Discolor (Spreng.) Little
- Beegum Onion - Allium Hoffmanii Ownbey
- Beehive Cactus - Coryphantha (engelm.) Lem.
- Beet - Beta Adanensis A. Pamukc. ex Aellen
- Beet - Beta Atriplicifolia Rouy
- Beet - Beta L.
- Beet - Beta Lomatogona Fisch. & C.A. Mey.
- Beet - Beta Nana Boiss. & Heldr.
- Beet - Beta Patellaris Moq.
- Beet - Beta Patula Aiton
- Beet - Beta Trigyna Waldst. & Kit.
- Beet - Beta Vulgaris L. ssp. macrocarpa (Guss.) Thell.
- Beethistle - Eryngium Articulatum Hook.
- Beetle Spurge - Euphorbia Eriantha Benth.
- Beetleweed - Galax Urceolata (Poir.) Brummitt
- Befaria Mutis, orth. rej.
- Befaria Racemosa Vent., orth. var.
- Beggarslice - Hackelia Virginiana (L.) I.M. Johnst.
- Beggarticks - Bidens L.
- Beggarticks - Bidens ×multiceps Fassett
- Begonia - Begonia L.
- Begonia Cucullata Willd. var. hookeri (A. DC.) L.B. Sm. & B.G. Schub.
- Begonia Semperflorens Link & Otto
- Behring's Rim Lichen - Lecanora Behringii Nyl.
- Beilschmiedia - Beilschmiedia Nees
- Beirut Clover - Trifolium Berytheum Boiss. & Blanche
- Bejar Clover - Trifolium Bejariense Moric.
- Bejuco Colorado - Ipomoea Repanda Jacq.
- Bejuco De Agua - Pinzona Coriacea Mart. & Zucc.
- Bejuco De Alambre - Neorudolphia Volubilis (Willd.) Britton
- Bejuco De Clavo - Tynanthus Polyanthus (Bureau) Sandw.
- Bejuco De Lira - Marcgravia Rectiflora Triana & Planch.
- Bejuco De Masa - Tournefortia Maculata Jacq.
- Bejuco De Mato - Dioclea Hexandra (Ralph) Mabberley
- Bejuco De Miel - Salmea Dc.
- Bejuco De Miel - Salmea Scandens (L.) DC.
- Bejuco De Puerco - Ipomoea Setifera Poir.
- Bejuco De Puerco - Ipomoea Tiliacea (Willd.) Choisy
- Bejuco De Santiago - Aristolochia Trilobata L.
- Bejuco De Sopla - Securidaca Virgata Sw.
- Bejuco De Sopla - Tetrapterys Inaequalis Cav.
- Bejuco - Mesechites Müll. Arg.
- Bejuco - Mesechites Repens (Jacq.) Miers
- Bejuco Prieto - Pristimera Caribaea (Urb.) A.C. Sm.
- Belah - Casuarina Lepidophloia F. Muell.
- Belamcanda - Belamcanda Adans.
- Belembe Silvestre - Xanthosoma Helleborifolium (Jacq.) Schott
- Belize Sage - Salvia Miniata Fernald
- Bell-flower Pricklypear - Opuntia Tenuiflora Small
- Bell-fruit Mallee - Eucalyptus Preissiana Schauer
- Belladonna - Atropa Bella-donna L.
- Belladonna - Atropa L.
- Belladonna Lily - Amaryllis Belladonna L.
- Bellard's Smartweed - Polygonum Patulum M. Bieb.
- Bellardi Bog Sedge - Kobresia Myosuroides (Vill.) Fiori
- Bellemerea Lichen - Bellemerea Cinereorufescens (Ach.) Clauzade & Roux
- Bellemerea Lichen - Bellemerea Diamarta (Ach.) Hafellner & Roux
- Bellemerea Lichen - Bellemerea Hafellner & Roux
- Bellemerea Lichen - Bellemerea Sanguinea (Krempelh.) Hafellner & Roux
- Bellemerea Lichen - Bellemerea Subsorediza (Lynge) R. Sant.
- Bellflower Beardtongue - Penstemon Campanulatus (Cav.) Willd. [excluded]
- Bellflower - Campanula L.
- Bellflower - Campanulastrum Small
- Bellflower Clematis - Clematis Campaniflora Brot.
- Bellflower - Codonopsis Pilosula (Franch.) Nannf.
- Bellflower Smartweed - Polygonum Campanulatum Hook. f.
- Bellis - Bellis L.
- Bellis Integrifolia Michx.
- Bellisima Grande - Antigonon Guatemalense Meisn.
- Belllflower African Cornlily - Ixia Campanulata Houtt.
- Bellorita - Erigeron Bellioides DC.
- Bellshape Gilia - Linanthus Campanulatus (A. Gray) J.M. Porter & L.A. Johnson
- Bellwort - Uvularia L.
- Bellyache Bush - Jatropha Gossypiifolia L.
- Bellyache Bush - Jatropha Gossypiifolia L. var. elegans (Pohl) Müll. Arg.
- Bellyache Bush - Jatropha Gossypiifolia L. var. gossypiifolia
- Bellybutton Veinfern - Phanerophlebia Umbonata Underw.
- Belmore Sentrypalm - Howeia Belmoreana (C. Moore & F. Muell.) Becc.
- Belonia Fennica Vain.
- Belonia Lichen - Belonia Körb. ex Nyl.
- Belonia Lichen - Belonia Russula Körb. ex Nyl.
- Beloperone Californica Benth.
- Beloperone Guttata Brandegee
- Beloperone - Justicia Californica (Benth.) D. Gibson
- Belvisia Mucronata (Fée) Copel.
- Bengal Coffee - Coffea Benghalensis Heyne ex Schult.
- Bengal Kino - Butea Monosperma (Lam.) Taubert
- Bengal Rinorea - Rinorea Bengalensis (Wall.) Kuntze
- Bengal Trumpet - Thunbergia Grandiflora Roxb.
- Benincasa - Benincasa Savi
- Benincasa Cerifera Savi
- Benitoa - Benitoa D.d. Keck
- Benitoa - Benitoa Occidentalis (H.M. Hall) D.D. Keck
- Benjamin Franklin Bush - Valerianella Ozarkana Dyal
- Benlomond Buckwheat - Eriogonum Nudum Douglas ex Benth. var. decurrens (S. Stokes) M.L. Bowerman
- Bensonia Oregona Abrams & Bacig.
- Bensoniella - Bensoniella Morton
- Bensoniella Oregana (Abrams & Bacig.) C.V. Morton, database artifact
- Bent Alkaligrass - Puccinellia Agrostidea T.J. Sørensen
- Bent Alligator-flag - Thalia Geniculata L.
- Bent Avens - Geum Geniculatum Michx.
- Bent Milkvetch - Astragalus Inflexus Douglas ex Hook.
- Bent Sedge - Carex Styloflexa Buckley
- Bent Two-whorl Buckwheat - Stenogonum Flexum (M.E. Jones) Reveal & J.T. Howell
- Bent-foot Speedwell - Veronica Campylopoda Boiss.
- Bentawn Flatsedge - Cyperus Reflexus Vahl
- Bentflower Fiddleneck - Amsinckia Lunaris J.F. Macbr.
- Bentflower Milkvetch - Astragalus Vexilliflexus Sheldon
- Bentflower Milkvetch - Astragalus Vexilliflexus Sheldon var. vexilliflexus
- Bentgrass - Agrostis Castellana Boiss. & Reuter
- Bentgrass - Agrostis L.
- Bentham Cypress - Hesperocyparis Benthamii (Endl.) Bartel
- Bentham's Broom - Lotus Benthamii Greene
- Bentham's Cornel - Cornus Capitata Wall. ex Roxb.
- Bentham's Hevea - Hevea Benthamiana Müll. Arg.
- Bentham's Pipewort - Eriocaulon Benthamii Kunth
- Benthamantha Caribaea (Jacq.) Kunth
- Benthamantha Edwardsii (A. Gray) Rose var. glabella (A. Gray) Wiggins
- Benthamantha Glabella (A. Gray) Rydb.
- Benthamia Lycopsoides (Lehm.) Lindl. ex Druce
- Benthamidia Capitata (Wall.) H. Hara
- Benthamidia Florida (L.) Spach
- Benthamidia Nuttallii (Audubon) Moldenke
- Bentley's Coralroot - Corallorhiza Bentleyi Freudenstein
- Bentonite Desertparsley - Lomatium Bentonitum K.M. Carlson & Mansfield
- Bentspike Fountaingrass - Pennisetum Nervosum (Nees) Trin.
- Bentspur Orchid - Campylocentrum Benth.
- Benzoin Aestivale (L.) Nees
- Benzoin Aestivale (L.) Nees var. pubescens Palmer & Steyerm.
- Benzoin Melissifolium (Walter) Nees
- Berberis Amplectens (Eastw.) L.C. Wheeler
- Berberis Aquifolium Pursh
- Berberis Aquifolium Pursh var. aquifolium
- Berberis Aquifolium Pursh var. dictyota (Jeps.) Jeps.
- Berberis Aquifolium Pursh var. repens (Lindl.) Scoggan
- Berberis Bealei Fortune
- Berberis Californica Jeps.
- Berberis Dictyota Jeps.
- Berberis Fremontii Torr.
- Berberis Haematocarpa Wooton
- Berberis Higginsiae Munz
- Berberis Julianiae C.K. Schneid., orth. var.
- Berberis Koreana Palib.
- Berberis Nervosa Pursh
- Berberis Nervosa Pursh var. mendocinensis J.B. Roof
- Berberis Nevinii A. Gray
- Berberis Pinnata Lag.
- Berberis Pinnata Lag. ssp. insularis Munz
- Berberis Pinnata Lag. ssp. pinnata
- Berberis Piperiana (Abrams) McMinn
- Berberis Pumila Greene
- Berberis Repens Lindl.
- Berberis Sonnei (Abrams) McMinn
- Berberis Swaseyi Buckley ex Young
- Berberis Thunbergii DC. var. atropurpurea Chenault
- Berberis Trifoliolata Moric.
- Berberis Trifoliolata Moric. var. glauca (I.M. Johnst.) M.C. Johnst. ex Laferrière
- Berdakl - Cayratia Palauana (Hosok.) Suess.
- Berengena De Paloma - Lycianthes Virgata (Lam.) Bitter
- Berenger's Mycobilimbia Lichen - Mycobilimbia Berengeriana (A. Massal.) Hafellner & V. Wirth
- Berg's Hedgenettle - Stachys Bergii G. Mulligan & D. Munro
- Berg's Panicgrass - Panicum Bergii Arechav.
- Bergamot Orange - Citrus ×aurantium L. ssp. bergamia (Risso & Poit.) Wight & Arn. ex Engl.
- Bergenia Cordifolia (Haw.) Sternb.
- Bergerocereus Emoryi (Engelm.) Britton & Rose
- Berggren's Plagiothecium Moss - Plagiothecium Berggrenianum Frisvoll
- Bergia - Bergia L.
- Berginia Virgata Harv. ex Benth. & Hook. f.
- Bering Chickweed - Cerastium Beeringianum Cham. & Schltdl.
- Bering Chickweed - Cerastium Beeringianum Cham. & Schltdl. ssp. beeringianum
- Bering Chickweed - Cerastium Beeringianum Cham. & Schltdl. ssp. beeringianum var. beeringianum
- Bering Chickweed - Cerastium Beeringianum Cham. & Schltdl. ssp. beeringianum var. grandiflorum (Fenzl) Hul
- Bering Chickweed - Cerastium Beeringianum Cham. & Schltdl. ssp. earlei (Rydb.) Hultén
- Bering Dwarf-primrose - Douglasia Beringensis S. Kelso
- Bering Hairgrass - Deschampsia Brevifolia R. Br.
- Bering Reindeer Lichen - Cladina Arbuscula (Wallr.) Hale & W.L. Culb. ssp. beringiana (Ahti) N.S. Golubk.
- Bering Sea Dock - Rumex Beringensis Jurtzev & V.V. Petrovsky
- Bering Sea Sedge - Carex Microchaeta T. Holm ssp. nesophila (T. Holm) A.E. Murray
- Bering's Dactylina Lichen - Dactylina Beringica C.D. Bird & J.W. Thomson
- Bering's Pohlia Moss - Pohlia Beringiensis Shaw
- Bering's Tufted Hairgrass - Deschampsia Beringensis Hultén
- Berkheya - Berkheya Ehrh.
- Berks County Hawthorn - Crataegus Bona Sarg.
- Berlandier's Fiddlewood - Citharexylum Berlandieri B.L. Rob.
- Berlandier's Hedgehog Cactus - Echinocereus Berlandieri (Engelm.) Haage
- Berlandier's Indian Mallow - Abutilon Berlandieri A. Gray ex S. Watson
- Berlandier's Jopoy - Esenbeckia Berlandieri Baill. ex Hemsl.
- Berlandier's Lobelia - Lobelia Berlandieri A. DC.
- Berlandier's Lobelia - Lobelia Berlandieri A. DC. var. berlandieri
- Berlandier's Lobelia - Lobelia Berlandieri A. DC. var. brachypoda (A. Gray) McVaugh
- Berlandier's Nettlespurge - Jatropha Cathartica Terán & Berl.
- Berlandier's Sundrops - Calylophus Berlandieri Spach
- Berlandier's Sundrops - Calylophus Berlandieri Spach ssp. berlandieri
- Berlandier's Sundrops - Calylophus Berlandieri Spach ssp. pinifolius (Engelm. ex A. Gray) Towner
- Berlandier's Trumpets - Acleisanthes Obtusa (Choisy) Standl.
- Berlandier's Wolfberry - Lycium Berlandieri Dunal
- Berlandier's Wolfberry - Lycium Berlandieri Dunal var. berlandieri
- Berlandier's Wolfberry - Lycium Berlandieri Dunal var. longistylum C.L. Hitchc.
- Berlandier's Wolfberry - Lycium Berlandieri Dunal var. parviflorum (A. Gray) Terracc.
- Berlandier's Yellow Flax - Linum Berlandieri Hook.
- Berlandier's Yellow Flax - Linum Berlandieri Hook. var. berlandieri
- Berlandier's Yellow Flax - Linum Berlandieri Hook. var. filifolium (Shinners) C.M. Rogers
- Berlandiera Dealbata (Torr. & A. Gray) Small
- Berlandiera Incisa Torr. & A. Gray
- Berlandiera Lyrata Benth. var. macrophylla A. Gray
- Berlandiera Texana DC.
- Berlandiera Texana DC. var. betonicifolia (Hook.) Torr. & A. Gray
- Berlandiera Tomentosa (Pursh) Nutt.
- Berlandiera Tomentosa (Pursh) Nutt. var. dealbata Torr. & A. Gray
- Berlandiera ×betonicifolia (Hook.) Small (pro sp.), database artifact
- Bermuda Buttercup - Oxalis Pes-caprae L.
- Bermuda Palm - Sabal Bermudana L.H. Bailey
- Bermudagrass - Cynodon Dactylon (L.) Pers.
- Bermudagrass - Cynodon Dactylon (L.) Pers. var. dactylon
- Bermudagrass - Cynodon Rich.
- Bernard Violet - Viola ×bernardii Greene (pro sp.)
- Bernardia Incana Morton
- Beror - Melicope Palawensis (Lauterb.) T.G. Hartley
- Berry's Penstemon - Penstemon Newberryi A. Gray ssp. berryi (Eastw.) D.D. Keck
- Bertero's Mistletoe - Phoradendron Dichotomum (Bertero ex Spreng.) Krug & Urb.
- Bertero's Tufted Airplant - Guzmania Berteroniana (Schult. & Schult. f.) Mez
- Berteroa Obliqua (Sm.) DC. [excluded]
- Berteron's Rattlebox - Crotalaria Berteriana DC.
- Berteron's Sandmat - Chamaesyce Berteriana (Balbis ex Spreng.) Millsp.
- Berthelotia Sericea (Nutt.) Rydb.
- Bertholletia - Bertholletia Humb. & Bonpl.
- Berula Erecta (Huds.) Coville var. incisa (Torr.) Cronquist
- Berula Incisa (Torr.) G.N. Jones
- Berula Pusilla Fernald
- Beruquillo - Marlierea Sintenisii Kiaersk.
- Bessey's Locoweed - Oxytropis Besseyi (Rydb.) Blank.
- Bessey's Locoweed - Oxytropis Besseyi (Rydb.) Blank. var. besseyi
- Bessey's Locoweed - Oxytropis Besseyi (Rydb.) Blank. var. fallax Barneby
- Bessey's Locoweed - Oxytropis Besseyi (Rydb.) Blank. var. obnapiformis (Ced. Porter) S.L. Welsh
- Bessey's Locoweed - Oxytropis Besseyi (Rydb.) Blank. var. ventosa (Greene) Barneby
- Bessey's Stickseed - Hackelia Besseyi (Rydb.) J.L. Gentry
- Besseya Cinerea (Raf.) Pennell
- Best's Hygrohypnum Moss - Hygrohypnum Bestii (Renauld & Bryhn) Broth.
- Bestia Breweriana (Lesq.) Grout
- Bestia Breweriana (Lesq.) Grout var. howei (Kindb.) Grout
- Bestia Breweriana (Lesq.) Grout var. lutescens (Lesq. & James) Grout
- Bestia Cristata (Hampe) L.F. Koch
- Bestia Holzingeri (Renauld & Cardot) Broth.
- Bestia Moss - Bestia Broth.
- Bestia Moss - Bestia Longipes (Sull. & Lesq.) Broth.
- Bestia Occidentalis (Sull. & Lesq.) Grout
- Bestia Vancouveriensis (Kindb.) Wijk & Margad.
- Beta Cicla (L.) L.
- Beta Corolliflora Zosimovic ex Buttler
- Beta Macrocarpa Guss.
- Beta Maritima L.
- Beta Vulgaris L. ssp. maritima (L.) Arcang.
- Beta Vulgaris L. var. cicla L.
- Betatakin Fiddleleaf - Nama Retrorsum J.T. Howell
- Betche's Bulbophyllum - Bulbophyllum Betchei F. Muell.
- Betel Palm - Areca Catechu L.
- Betel Pepper - Piper Betel L.
- Bethlehem Lungwort - Pulmonaria Saccharata Mill.
- Betonica Grandiflora Stephan ex Willd.
- Betonica Officinalis L.
- Betonyleaf Brickellbush - Brickellia Betonicifolia A. Gray
- Betonyleaf Noseburn - Tragia Betonicifolia Nutt.
- Betonyleaf Thoroughwort - Conoclinium Betonicifolium (Mill.) R.M. King & H. Rob.
- Betonyleaf Thoroughwort - Conoclinium Betonicifolium (Mill.) R.M. King & H. Rob. var. betonicifolium
- Betonyleaf Thoroughwort - Conoclinium Betonicifolium (Mill.) R.M. King & H. Rob. var. integrifolium (A. Gray) T.F. Pa
- Betula Alaskana Sarg.
- Betula Alba L. var. commutata Regel
- Betula Alba L. var. cordifolia (Regel) Regel
- Betula Alba L., nom. utique rej.
- Betula Alleghaniensis Britton var. fallax (Fassett) Brayshaw
- Betula Andrewsii A. Nelson
- Betula Beeniana A. Nelson
- Betula Cordifolia Regel
- Betula Exilis Sukaczev
- Betula Fontinalis Sarg.
- Betula Glandulifera (Regel) Butler
- Betula Glandulosa Michx. var. glandulifera (Regel) Gleason
- Betula Glandulosa Michx. var. hallii (Howell) C.L. Hitchc.
- Betula Glandulosa Michx. var. sibirica (Ledeb.) C.K. Schneid.
- Betula Japonica (Miq.) Siebold
- Betula Kamtschatica (Regel) Jansson ex Vassiljev
- Betula Kenaica W.H. Evans
- Betula Lenta L. ssp. uber (Ashe) A.E. Murray
- Betula Lenta L. var. uber Ashe
- Betula Lutea Michx. f.
- Betula Lutea Michx. f. var. fallax Fassett
- Betula Lutea Michx. f. var. macrolepis Fernald
- Betula Mandshurica (Regel) Nakai
- Betula Mandshurica (Regel) Nakai var. japonica (Miq.) Rehder
- Betula Mandshurica (Regel) Nakai var. kamtschatica (Regel) Rehder
- Betula Mandshurica (Regel) Nakai var. szechuanica (C.K. Schneid.) Rehder
- Betula Nana L. var. glandulifera (Regel) B. Boivin
- Betula Nana L. var. renifolia (Fernald) B. Boivin
- Betula Nana L. var. sibirica Ledeb.
- Betula Neoalaskana Sarg. var. kenaica (W.H. Evans) B. Boivin
- Betula Occidentalis Hook. var. fecunda Fernald
- Betula Occidentalis Hook. var. inopina (Jeps.) C.L. Hitchc.
- Betula Odorata Bechst.
- Betula Papyrifera Marshall ssp. humilis (Regel) Hultén
- Betula Papyrifera Marshall ssp. occidentalis (Hook.) Hultén
- Betula Papyrifera Marshall var. commutata (Regel) Fernald
- Betula Papyrifera Marshall var. elobata (Fernald) Sarg.
- Betula Papyrifera Marshall var. humilis (Regel) Fernald & Raup
- Betula Papyrifera Marshall var. macrostachya Fernald
- Betula Papyrifera Marshall var. minor (Tuck.) S. Watson & J.M. Coult.
- Betula Papyrifera Marshall var. neoalaskana (Sarg.) Raup
- Betula Papyrifera Marshall var. occidentalis (Hook.) Sarg.
- Betula Papyrifera Marshall var. pensilis Fernald
- Betula Papyrifera Marshall var. subcordata (Rydb.) Sarg.
- Betula Pendula Roth f. dalecarlica (L. f.) C.K. Schneid.
- Betula Perfiljevii V.N. Vassil.
- Betula Piperi Britton
- Betula Platyphylla Sukaczev var. japonica (Miq.) H. Hara [excluded]
- Betula Platyphylla Sukaczev var. kamtschatica (Regel) H. Hara [excluded]
- Betula Platyphylla Sukaczev var. szechuanica C.K. Schneid.
- Betula Pubescens Ehrh. ssp. borealis (Spach) Á. Löve & D. Löve
- Betula Pubescens Ehrh. var. pubescens
- Betula Resinifera Britton
- Betula Saxophila Lepage
- Betula Terrae-novae Fernald
- Betula Tortuosa Ledeb.
- Betula Verrucosa Ehrh.
- Betula ×alpestris Fr.
- Betula ×alpestris Fr. var. ×sukaczewii (Soczava) Govaerts
- Betula ×arbuscula Dugle
- Betula ×caerulea-grandis Blanch.
- Betula ×commixta Sarg.
- Betula ×sukaczewii Soczava
- Betula ×ungavensis Lepage
- Betula-alnus Maritima Marshall
- Beyrich Threeawn - Aristida Beyrichiana Trin. & Rupr.
- Beyrich's Entodon Moss - Entodon Beyrichii (Schwägr.) Müll. Hal.
- Beyrich's Fleabane - Erigeron Strigosus Muhl. ex Willd. var. beyrichii (Fisch. & C.A. Mey.) Torr. & A. G
- Beyrich's Hooded Orchid - Galeandra Beyrichii Rchb. f.
- Bhutan Pine - Pinus Wallichiana A.B. Jacks.
- Biancaea Sepiaria (Roxb.) Todaro
- Biannual Lettuce - Lactuca Ludoviciana (Nutt.) Riddell
- Biatora Albohyalina (Nyl.) Bagl. & Carestia
- Biatora Anthracophila (Nyl.) Hafellner
- Biatora Carneoalbida (Müll. Arg.) Coppins
- Biatora Chrysantha (Zahlbr.) Printzen
- Biatora Cuprea (Sommerf.) Fr.
- Biatora Efflorescens (Hedl.) Rasanen
- Biatora Epixanthoides (Nyl.) Diederich
- Biatora Flavopunctata (Tønsberg) Hinteregger & Printzen
- Biatora Lichen - Biatora Botryosa Fr.
- Biatora Lichen - Biatora Fr.
- Biatora Lichen - Biatora Helvola (Körb.) Hellbom
- Biatora Meiocarpa (Nyl.) Arnold
- Biatora Porphyrospoda Anzi
- Biatora Pullata Norman
- Biatora Rufidula (Graewe.) S. Ekman & Printzen
- Biatora Sphaeroides (Dicks.) Körb.
- Biatora Subduplex (Nyl.) Printzen
- Biatora Toensbergii Holien & Printzen
- Biatora Turgidula (Fr.) Nyl.
- Biatora Vacciniicola (Tønsberg) Printzen
- Biatorella Albidula (Willey) Zahlbr.
- Biatorella Campestris (Fr.) Almq.
- Biatorella Clauzadeana Llimona
- Biatorella Clavus (DC.) Th. Fr.
- Biatorella Conspersa (Fée) Vain.
- Biatorella Fossarum (Dufour) Th. Fr.
- Biatorella Hypophaea (Nyl.) Blomb. & Forss.
- Biatorella Kulshanensis Herre
- Biatorella Lichen - Biatorella Cyphalea (Tuck.) Zahlbr.
- Biatorella Lichen - Biatorella De Not.
- Biatorella Lichen - Biatorella Hemisphaerica Anzi
- Biatorella Lichen - Biatorella Plicata H. Magn.
- Biatorella Microhaema Norman
- Biatorella Moriformis (Ach.) Th. Fr.
- Biatorella Ochrophora (Nyl.) Arnold
- Biatorella Pruinosa (Körb.) Mudd
- Biatorella Resinae (Fr.) Th. Fr.
- Biatorella Simplex (Davies) Branth & Rostrup
- Biatorella Testudinea (Ach.) A. Massal.
- Biatoropsis Rananen
- Biatoropsis Usnearum Rasanen
- Bicknell's Cranesbill - Geranium Bicknellii Britton
- Bicknell's Milkvetch - Astragalus Consobrinus (Barneby) S.L. Welsh
- Bicknell's Sedge - Carex Bicknellii Britton
- Bicknell's Sedge - Carex Opaca (F.J. Herm.) P. Rothr. & Reznicek
- Bicolor Fanmustard - Nerisyrenia Camporum (A. Gray) Greene
- Bicolored Spleenwort - Asplenium Heterochroum Kunze
- Bicuculla Canadensis (Goldie) Millsp.
- Bicuculla Cucullaria (L.) Millsp.
- Bicuculla Eximia (Ker Gawl.) Millsp.
- Biddy-biddy - Acaena Novae-zelandiae Kirk
- Bidens Acuta (Wiegand) Britton
- Bidens Aristosa (Michx.) Britton var. fritcheyi Fernald
- Bidens Aristosa (Michx.) Britton var. mutica (A. Gray) Gattinger
- Bidens Aristosa (Michx.) Britton var. retrorsa (Sherff) Wunderlin
- Bidens Asplenioides Sherff
- Bidens Asymmetrica (Levl.) Sherff var. subocculata O. Deg. & Sherff
- Bidens Aurea (Aiton) Sherff var. wrightii (A. Gray) Sherff
- Bidens Awaluana O. Deg., I. Deg. & Sherff
- Bidens Bidentoides (Nutt.) Britton var. mariana (S.F. Blake) Sherff
- Bidens Bipinnata L. var. biternatoides Sherff
- Bidens Bipinnata L. var. cynapiifolia (Kunth) G. Maza
- Bidens Campylotheca Sch. Bip. var. pentamera Sherff
- Bidens Caudatus (Kunth) Sch. Bip.
- Bidens Cernua L. var. cernua
- Bidens Cernua L. var. dentata (Nutt.) B. Boivin
- Bidens Cernua L. var. elata Torr. & A. Gray
- Bidens Cernua L. var. elliptica Wiegand
- Bidens Cernua L. var. integra Wiegand
- Bidens Cernua L. var. minima (Huds.) Pursh
- Bidens Cernua L. var. oligodonta Fernald & H. St. John
- Bidens Cernua L. var. radiata DC.
- Bidens Coartata Sherff
- Bidens Comosa (A. Gray) Wiegand
- Bidens Connata Muhl. ex Willd. var. ambiversa Fassett
- Bidens Connata Muhl. ex Willd. var. anomala Farw.
- Bidens Connata Muhl. ex Willd. var. fallax (Warnst.) Sherff
- Bidens Connata Muhl. ex Willd. var. gracilipes Fernald
- Bidens Connata Muhl. ex Willd. var. inundata Fernald
- Bidens Connata Muhl. ex Willd. var. petiolata (Nutt.) Farw.
- Bidens Connata Muhl. ex Willd. var. pinnata S. Watson
- Bidens Connata Muhl. ex Willd. var. submutica Fassett
- Bidens Coronata (L.) Britton var. brachyodonta Fernald
- Bidens Coronata (L.) Britton var. tenuiloba (A. Gray) Sherff
- Bidens Coronata (L.) Britton var. trichosperma (Michx.) Fernald
- Bidens Cosmoides (A. Gray) Sherff var. refracta Hochr.
- Bidens Ctenophylla Sherff
- Bidens Cynapiifolia Kunth var. portoricensis (Spreng.) O.E. Schulz
- Bidens Cynapiifolia Kunth var. tenuis O.E. Schulz
- Bidens Degeneri Sherff
- Bidens Degeneri Sherff var. apioides Sherff
- Bidens Distans Sherff
- Bidens Eatonii Fernald var. fallax Fernald
- Bidens Eatonii Fernald var. illicita S.F. Blake
- Bidens Eatonii Fernald var. interstes Fassett
- Bidens Eatonii Fernald var. kennebecensis Fernald
- Bidens Eatonii Fernald var. major Fassett
- Bidens Eatonii Fernald var. mutabilis Fassett
- Bidens Eatonii Fernald var. simulans Fassett
- Bidens Elata (Torr. & A. Gray) Sherff
- Bidens Elegans Greene
- Bidens Fecunda O. Deg. & Sherff
- Bidens Ferax O. Deg. & Sherff
- Bidens Frondosa L. var. anomala Porter ex Fernald
- Bidens Frondosa L. var. caudata Sherff
- Bidens Frondosa L. var. pallida Wiegand
- Bidens Frondosa L. var. puberula Wiegand
- Bidens Frondosa L. var. stenodonta Fernald & H. St. John
- Bidens Fulvescens Sherff
- Bidens Glaucescens Greene
- Bidens Gracilis Nutt.
- Bidens Graciloides Sherff
- Bidens Halawana O. Deg. & Sherff
- Bidens Heterodoxa (Fernald) Fernald & H. St. John var. agnostica Fernald
- Bidens Heterodoxa (Fernald) Fernald & H. St. John var. atheistica Fernald
- Bidens Heterodoxa (Fernald) Fernald & H. St. John var. monardifolia Fernald
- Bidens Heterodoxa (Fernald) Fernald & H. St. John var. orthodoxa Fernald & H. St.
- Bidens Heterophylla Ortega
- Bidens Hyperborea Greene var. cathancensis Fernald
- Bidens Hyperborea Greene var. colpophila (Fernald & H. St. John) Fernald
- Bidens Hyperborea Greene var. laurentiana Fassett
- Bidens Infirma Fernald
- Bidens Involucrata (Nutt.) Britton
- Bidens Macrocarpa (A. Gray) Sherff var. ovatifolia (A. Gray) Sherff
- Bidens Mariana S.F. Blake
- Bidens Mauiensis (A. Gray) Sherff var. ciliata H. St. John
- Bidens Mauiensis (A. Gray) Sherff var. cuneatoides Sherff
- Bidens Mauiensis (A. Gray) Sherff var. forbesiana Sherff
- Bidens Mauiensis (A. Gray) Sherff var. lanaiensis Sherff
- Bidens Mauiensis (A. Gray) Sherff var. media Sherff
- Bidens Megapotamica Spreng.
- Bidens Menziesii (A. Gray) Sherff var. filiformis Sherff
- Bidens Menziesii (A. Gray) Sherff var. lepida O. Deg. & Sherff
- Bidens Menziesii (A. Gray) Sherff var. leptondontia Sherff
- Bidens Micrantha Gaudich. var. caduca (Sherff) Sherff
- Bidens Micrantha Gaudich. var. kaalana Sherff
- Bidens Micrantha Gaudich. var. laciniata (Hillebr.) Sherff
- Bidens Micrantha Gaudich. var. rudimentifera Sherff
- Bidens Mitis (Michx.) Sherff var. leptophylla (Nutt.) Small
- Bidens Napaliensis Sherff
- Bidens Nashii Small
- Bidens Nematocera (Sherff) Sherff
- Bidens Nivea L.
- Bidens Obtusiloba Sherff
- Bidens Odorata Cav.
- Bidens Pentamera (Sherff) O. Deg. & Sherff
- Bidens Perversa O. Deg. & Sherff
- Bidens Perversa O. Deg. & Sherff var. aquilonalis O. Deg. & Sherff
- Bidens Pilosa L. var. bimucronata (Turcz.) Sch. Bip.
- Bidens Pilosa L. var. minor (Blume) Sherff
- Bidens Pilosa L. var. pilosa
- Bidens Pilosa L. var. radiata Sch. Bip.
- Bidens Polylepis S.F. Blake
- Bidens Polylepis S.F. Blake var. retrorsa Sherff
- Bidens Puberula (Wiegand) Rydb.
- Bidens Pulchella (Less.) Sch. Bip.
- Bidens Salicoides Sherff
- Bidens Sandvicensis Less. var. antrorsa O. Deg. & Sherff
- Bidens Sandvicensis Less. var. caduca Sherff
- Bidens Sandvicensis Less. var. imminuta O. Deg. & Sherff
- Bidens Sandvicensis Less. var. leiocarpa O. Deg. & Sherff
- Bidens Sandvicensis Less. var. setosa (Sherff) Sherff
- Bidens Scandens L.
- Bidens Skottsbergii Sherff
- Bidens Skottsbergii Sherff var. conglutinata (O. Deg. & Sherff) Sherff
- Bidens Skottsbergii Sherff var. pololuensis O. Deg. & Sherff
- Bidens Squarrosa Kunth [excluded]
- Bidens Stokesii Sherff
- Bidens Trichosperma (Michx.) Britton
- Bidens Tripartita L. var. heterodoxa Fernald
- Bidens Urbanii Greenm.
- Bidens Vulgata Greene var. puberula (Wiegand) Greene
- Bidens Vulgata Greene var. schizantha Lunell
- Bidens Waianensis Sherff
- Bidens Waimeana Sherff
- Bidens ×dimidiata O. Deg. & Sherff
- Bidens ×magnidisca O. Deg. & Sherff
- Bidens ×micranthoides Sherff
- Bidwell's Knotweed - Polygonum Bidwelliae S. Watson
- Biennial Beeblossom - Oenothera Gaura W.L. Wagner & Hoch
- Biennial Cinquefoil - Potentilla Biennis Greene
- Biennial Woollywhite - Hymenopappus Biennis B.L. Turner
- Biennial Wormwood - Artemisia Biennis Willd.
- Biennial Wormwood - Artemisia Biennis Willd. var. biennis
- Biennial Wormwood - Artemisia Biennis Willd. var. diffusa Dorn
- Big Arroyo Rockmat - Petrophytum Acuminatum Rydb.
- Big Bear Valley Phlox - Phlox Dolichantha A. Gray
- Big Bend Barometerbush - Leucophyllum Minus A. Gray
- Big Bend Beardtongue - Penstemon Havardii A. Gray
- Big Bend Bluebonnet - Lupinus Havardii S. Watson
- Big Bend Bluegrass - Poa Strictiramea Hitchc.
- Big Bend Foxtail Cactus - Escobaria Dasyacantha (Engelm.) Britton & Rose
- Big Bend Foxtail Cactus - Escobaria Dasyacantha (Engelm.) Britton & Rose var. dasyacantha
- Big Bend Pricklypear - Grusonia Aggeria (B.E. Ralston & Hilsenb.) E.F. Anderson
- Big Bend Pricklypear - Grusonia Schottii (Engelm.) H. Rob.
- Big Bend Ringstem - Anulocaulis Eriosolenus (A. Gray) Standl.
- Big Bend Thelypody - Thelypodium Tenue Rollins
- Big Bend Woodyaster - Xylorhiza Wrightii (A. Gray) Greene
- Big Blackberry - Rubus Florulentus Focke
- Big Blue Birch - Betula ×caerulea Blanch. var. grandis Blanch. (pro nm.)
- Big Blue Lilyturf - Liriope Muscari (Decne.) L.H. Bailey
- Big Bluestem - Andropogon Gerardii Vitman
- Big Caltrop - Kallstroemia Maxima (L.) Hook. & Arn.
- Big Carpetgrass - Axonopus Furcatus (Flueggé) Hitchc.
- Big Chickweed - Cerastium Fontanum Baumg. ssp. vulgare (Hartm.) Greuter & Burdet
- Big Cordgrass - Spartina Cynosuroides (L.) Roth
- Big Cypress Star Orchid - Epidendrum Strobiliferum Rchb. f.
- Big Deervetch - Lotus Crassifolius (Benth.) Greene
- Big Deervetch - Lotus Crassifolius (Benth.) Greene var. crassifolius
- Big Deervetch - Lotus Crassifolius (Benth.) Greene var. otayensis Moran ex Isely
- Big Devils Beggartick - Bidens Vulgata Greene
- Big Floatingheart - Nymphoides Aquatica (J.F. Gmel.) Kuntze
- Big Galleta - Pleuraphis Rigida Thurb.
- Big Horn Fleabane - Erigeron Allocotus S.F. Blake
- Big Horseshoe Lake Dewberry - Rubus Stipulatus L.H. Bailey
- Big Island Ma'oloa - Neraudia Ovata Gaudich.
- Big Map Lichen - Rhizocarpon Grande (Flörke ex Flotow) Arnold
- Big Pine Biscuitroot - Lomatium Rigidum (M.E. Jones) Jeps.
- Big Quakinggrass - Briza Maxima L.
- Big Red Sage - Salvia Pentstemonoides Kunth & Bouché
- Big Red Stem Moss - Pleurozium Mitt.
- Big Sacaton - Sporobolus Wrightii Munro ex Scribn.
- Big Sagebrush - Artemisia Tridentata Nutt.
- Big Sagebrush - Artemisia Tridentata Nutt. ssp. parishii (A. Gray) H.M. Hall & Clem.
- Big Sagebrush - Artemisia Tridentata Nutt. ssp. spiciformis (Osterh.) Kartesz & Gandhi
- Big Sagebrush - Artemisia Tridentata Nutt. ssp. xericensis Winward ex R. Rosentreter & R. Kelsey
- Big Saltbush - Atriplex Lentiformis (Torr.) S. Watson
- Big Saltbush - Atriplex Lentiformis (Torr.) S. Watson ssp. lentiformis
- Big Sandbur - Cenchrus Myosuroides Kunth
- Big Spore Andreaeobryum Moss - Andreaeobryum Macrosporum Steere & B.M. Murray
- Big Spore Cracked Lichen - Acarospora Macrospora (Hepp) Bagl.
- Big Squirreltail - Elymus Multisetus M.E. Jones
- Big Tarweed - Blepharizonia Plumosa (Kellogg) Greene
- Big Tarweed - Blepharizonia Plumosa (Kellogg) Greene ssp. plumosa
- Big Tarweed - Blepharizonia Plumosa (Kellogg) Greene ssp. viscida D.D. Keck
- Big Trefoil - Lotus Pedunculatus Cav.
- Big Tripogon - Tripogon Major Hook. f.
- Big Western Bittercress - Cardamine Occidentalis (S. Watson ex B.L. Rob.) Howell
- Big Yellow Velvetleaf - Wissadula Amplissima (L.) R.E. Fries
- Big-flower Broom - Chamaecytisus Supinus (L.) Link
- Big-horn Bog Orchid - Habenaria Macroceratitis Willd.
- Big-mouth Star Orchid - Epidendrum Amphistomum A. Rich.
- Big-sage - Stachys Macrantha (K. Koch) Stearn
- Big-spore Quillwort - Isoetes Macrospora Durieu
- Bigberry Manzanita - Arctostaphylos Glauca Lindl.
- Bigbract Verbena - Verbena Bracteata Cav. ex Lag. & Rodr.
- Bigcone Douglas-fir - Pseudotsuga Macrocarpa (Vasey) Mayr
- Bigelovia Brachylepis A. Gray
- Bigelovia Intricata A. Gray
- Bigelovia Vaseyi A. Gray
- Bigelow Sage - Artemisia Bigelovii A. Gray
- Bigelow's Amaranth - Amaranthus Bigelovii Uline & Bray
- Bigelow's Bahia - Bahia Bigelovii A. Gray
- Bigelow's Beggarticks - Bidens Bigelovii A. Gray
- Bigelow's Beggarticks - Bidens Bigelovii A. Gray var. angustiloba (DC.) R.E. Ballard ex Melchert
- Bigelow's Beggarticks - Bidens Bigelovii A. Gray var. bigelovii
- Bigelow's Bluegrass - Poa Bigelovii Vasey & Scribn.
- Bigelow's Bristlehead - Carphochaete Bigelovii A. Gray
- Bigelow's Desertgrass - Blepharidachne Bigelovii (S. Watson) Hack.
- Bigelow's False Willow - Baccharis Bigelovii A. Gray
- Bigelow's Fleabane - Erigeron Bigelovii A. Gray
- Bigelow's Leather Flower - Clematis Bigelovii Torr.
- Bigelow's Linanthus - Linanthus Bigelovii (A. Gray) Greene
- Bigelow's Monkeyflower - Mimulus Bigelovii (A. Gray) A. Gray
- Bigelow's Monkeyflower - Mimulus Bigelovii (A. Gray) A. Gray var. bigelovii
- Bigelow's Nolina - Nolina Bigelovii (Torr.) S. Watson
- Bigelow's Onion - Allium Bigelovii S. Watson
- Bigelow's Porotrichum Moss - Porotrichum Bigelovii (Sull.) Kindb.
- Bigelow's Rubberweed - Hymenoxys Bigelovii (A. Gray) K.F. Parker
- Bigelow's Sedge - Carex Bigelowii Torr. ex Schwein.
- Bigelow's Sneezeweed - Helenium Bigelovii A. Gray
- Bigelow's Tansyaster - Machaeranthera Bigelovii (A. Gray) Greene
- Bigelow's Tansyaster - Machaeranthera Bigelovii (A. Gray) Greene var. bigelovii
- Bigelow's Tansyaster - Machaeranthera Bigelovii (A. Gray) Greene var. commixta (Greene) B.L. Turner
- Bigelow's Tansyaster - Machaeranthera Bigelovii (A. Gray) Greene var. mucronata (Greene) B.L. Turner
- Bigelow's Thoroughwort - Chromolaena Bigelovii (A. Gray) R.M. King & H. Rob.
- Bigelow's Tickseed - Coreopsis Bigelovii (A. Gray) H.M. Hall
- Bigelow's Tobacco - Nicotiana Quadrivalvis Pursh var. bigelovii (Torr.) DeWolf
- Bigelow's Willow - Salix Lasiolepis Benth. var. bigelovii (Torr.) Bebb
- Bigelowia Nudata (Michx.) DC. var. australis (L.C. Anderson) Shinners
- Bigelowia Virgata (Nutt.) DC.
- Bigflower Agoseris - Agoseris Grandiflora (Nutt.) Greene
- Bigflower Bladderpod - Lesquerella Grandiflora (Hook.) S. Watson
- Bigflower Cinquefoil - Potentilla Fissa Nutt.
- Bigflower Clover - Trifolium Michelianum Savi
- Bigflower Pawpaw - Asimina Obovata (Willd.) Nash
- Bigflower Tellima - Tellima Grandiflora (Pursh) Douglas ex Lindl.
- Bigfoot Waterclover - Marsilea Macropoda Engelm. ex A. Braun
- Bigfruit Crab - Malus ×platycarpa Rehder (pro sp.)
- Bigfruit Dodder - Cuscuta Megalocarpa Rydb.
- Bigfruit Evening Primrose - Oenothera Macrocarpa Nutt.
- Bigfruit Evening Primrose - Oenothera Macrocarpa Nutt. ssp. incana (A. Gray) Wagner
- Bigfruit Evening Primrose - Oenothera Macrocarpa Nutt. ssp. macrocarpa
- Bigfruit Hawthorn - Crataegus Macrosperma Ashe
- Bighead Dustymaiden - Chaenactis Macrantha D.C. Eaton
- Bighead Horkelia - Horkelia Fusca Lindl. ssp. capitata (Lindl.) D.D. Keck
- Bighead Knapweed - Centaurea Macrocephala Puschk. ex Willd.
- Bighead Pygmycudweed - Evax Prolifera Nutt. ex DC.
- Bighead Rush - Juncus Megacephalus M.A. Curtis
- Bighead Straitjackets - Micropsis Dasycarpa (Griseb.) Beauverd
- Bigleaf Aster - Eurybia Macrophylla (L.) Cass.
- Bigleaf Bristlegrass - Setaria Megaphylla (Steud.) T. Dur. & Schinz
- Bigleaf Clover - Trifolium Plumosum Douglas ex Hook. ssp. amplifolium (J.S. Martin) J.M. Gillett
- Bigleaf Crownbeard - Verbesina Dissita A. Gray
- Bigleaf Dendrobium - Dendrobium Macrophyllum A. Rich.
- Bigleaf Lupine - Lupinus Polyphyllus Lindl.
- Bigleaf Lupine - Lupinus Polyphyllus Lindl. ssp. bernardinus (Abrams ex C.P. Sm.) Munz
- Bigleaf Lupine - Lupinus Polyphyllus Lindl. ssp. polyphyllus
- Bigleaf Lupine - Lupinus Polyphyllus Lindl. ssp. polyphyllus var. grandifolius (Lindl. ex J. Agardh)
- Bigleaf Lupine - Lupinus Polyphyllus Lindl. ssp. polyphyllus var. pallidipes (A. Heller) C.P. Sm.
- Bigleaf Lupine - Lupinus Polyphyllus Lindl. ssp. polyphyllus var. polyphyllus
- Bigleaf Lupine - Lupinus Polyphyllus Lindl. ssp. superbus (A. Heller) Munz
- Bigleaf Magnolia - Magnolia Macrophylla Michx.
- Bigleaf Maple - Acer Macrophyllum Pursh
- Bigleaf Mistletoe - Phoradendron Racemosum (Aubl.) Krug & Urb.
- Bigleaf Paspalum - Paspalum Macrophyllum Kunth
- Bigleaf Periwinkle - Vinca Major L.
- Bigleaf Sedge - Carex Amplifolia Boott
- Bigleaf Snowbell - Styrax Grandifolius Aiton
- Bignay - Antidesma Bunius (L.) Spreng.
- Bignonia - Bignonia L.
- Bignonia Capensis Thunb.
- Bignonia Caryophyllea Bello
- Bignonia Linearis Cav.
- Bignonia Radicans L.
- Bignonia Sempervirens L.
- Bignonia Stans L.
- Bignonia Unguis-cati L.
- Bignonia Venusta Ker Gawl.
- Bigonia Sempervirens L., database artifact
- Bigpod Ceanothus - Ceanothus Megacarpus Nutt.
- Bigpod Ceanothus - Ceanothus Megacarpus Nutt. var. megacarpus
- Bigpod Lady's Nightcap - Bonamia Ovalifolia (Torr.) Hallier f.
- Bigpod Sesbania - Sesbania Herbacea (Mill.) McVaugh
- Bigroot Blue-eyed Grass - Sisyrinchium Radicatum E.P. Bicknell
- Bigroot Springparsley - Cymopterus Macrorhizus Buckley
- Bigseed Alfalfa Dodder - Cuscuta Indecora Choisy
- Bigseed Alfalfa Dodder - Cuscuta Indecora Choisy var. bifida Yunck.
- Bigseed Alfalfa Dodder - Cuscuta Indecora Choisy var. indecora
- Bigseed Biscuitroot - Lomatium Macrocarpum (Nutt. ex Torr. & A. Gray) J.M. Coult. & Rose
- Bigseed Dodder - Cuscuta Indecora Choisy var. longisepala Yunck.
- Bigseed Dodder - Cuscuta Indecora Choisy var. neuropetala (Engelm.) Hitchc.
- Bigsepal Glochidion - Glochidion Macrosepalum Hosok.
- Bigtooth Aspen - Populus Grandidentata Michx.
- Bigtooth Maple - Acer Grandidentatum Nutt.
- Bigtooth Maple - Acer Grandidentatum Nutt. var. grandidentatum
- Bigtop Lovegrass - Eragrostis Hirsuta (Michx.) Nees
- Bihai Bihai (L.) Griggs, nom. inval.
- Bijao - Renealmia Occidentalis (Sw.) Sweet
- Bikkia Reinw.
- Bikkia Tetrandra (L. f.) A. Rich.
- Bilderdykia Aubertii (Henry) Moldenke
- Bilderdykia Baldschuanica (Regel) D.A. Webb
- Bilderdykia Cilinodis (Michx.) Greene
- Bilderdykia Cilinodis (Michx.) Greene var. laevigata (Fernald) C.F. Reed
- Bilderdykia Convolvulus (L.) Dumort.
- Bilderdykia Cristata (Engelm. & A. Gray) Greene
- Bilderdykia Dumetorum (L.) Dumort.
- Bilderdykia Scandens (L.) Greene
- Bilderdykia Scandens (L.) Greene var. cristata (Engelm. & A. Gray) C.F. Reed
- Bilimbi - Averrhoa Bilimbi L.
- Bilimbia Caudata (Nyl.) Fink
- Bilimbia Pammellii Fink
- Bilimbia Tricholoma (Mont.) Fink
- Bill Williams Mountain Giant Hyssop - Agastache Pallidiflora (A. Heller) Rydb.
- Bill Williams Mountain Giant Hyssop - Agastache Pallidiflora (A. Heller) Rydb. ssp. neomexicana (Briq.) Lint & Epling
- Bill Williams Mountain Giant Hyssop - Agastache Pallidiflora (A. Heller) Rydb. ssp. neomexicana (Briq.) Lint & Epling var. ha
- Bill Williams Mountain Giant Hyssop - Agastache Pallidiflora (A. Heller) Rydb. ssp. neomexicana (Briq.) Lint & Epling var. ne
- Bill Williams Mountain Giant Hyssop - Agastache Pallidiflora (A. Heller) Rydb. ssp. pallidiflora
- Bill Williams Mountain Giant Hyssop - Agastache Pallidiflora (A. Heller) Rydb. ssp. pallidiflora var. gilensis R.W. Sanders
- Bill Williams Mountain Giant Hyssop - Agastache Pallidiflora (A. Heller) Rydb. ssp. pallidiflora var. greenei (Briq.) R.W. Sa
- Bill Williams Mountain Giant Hyssop - Agastache Pallidiflora (A. Heller) Rydb. ssp. pallidiflora var. pallidiflora
- Bill's Neoparrya - Neoparrya Lithophila Mathias
- Billarder's Bryum Moss - Bryum Billarderi Schwägr.
- Billbergia - Billbergia Thunb.
- Billings' Sedge - Carex Billingsii (O.W. Knight) Kirschb.
- Billion-dollar Grass - Echinochloa Frumentacea Link
- Bilobed Grewia - Grewia Biloba G. Don
- Biltia Vaseyi (A. Gray) Small
- Biltmore's Carrionflower - Smilax Biltmoreana (Small) J.B.S. Norton ex Pennell
- Bindweed - Convolvulus L.
- Bindweed Dwarf Morning-glory - Evolvulus Convolvuloides (Willd. ex Schult.) Stearn
- Bingen Lupine - Lupinus Bingenensis Suksd.
- Bingen Lupine - Lupinus Bingenensis Suksd. var. bingenensis
- Bingen Lupine - Lupinus Bingenensis Suksd. var. dubius C.P. Sm.
- Bingen Lupine - Lupinus Bingenensis Suksd. var. subsaccatus Suksd.
- Bingham's False Bindweed - Calystegia Sepium (L.) R. Br. ssp. binghamiae (Greene) Brummitt
- Binjai - Mangifera Caesia Jack ex Wall.
- Bioletti's Fleabane - Erigeron Biolettii Greene
- Bioletti's Rush Broom - Lotus Junceus (Benth.) Greene var. biolettii (Greene) Ottley
- Biota Orientalis (L.) Endl.
- Biovularia Olivacea (C. Wright ex Griseb.) Kam.
- Bipinnate Princesplume - Stanleya Pinnata (Pursh) Britton var. bipinnata (Greene) Rollins
- Birch - Betula L.
- Birch - Betula ×dugleana Lepage
- Birch - Betula ×eastwoodiae Sarg. (pro sp.)
- Birch - Betula ×hornei Butler (pro sp.)
- Birch - Betula ×jackii C.K. Schneid.
- Birch - Betula ×purpusii C.K. Schneid.
- Birch - Betula ×sargentii Dugle
- Birch - Betula ×utahensis Britton (pro sp.)
- Birch - Betula ×winteri Dugle
- Birchbark Dot Lichen - Leptorhaphis Atomaria (Ach.) Szat.
- Birchbark Dot Lichen - Leptorhaphis Epidermidis (Ach.) Th. Fr.
- Birchbark Dot Lichen - Leptorhaphis Körb.
- Birchbark Dot Lichen - Leptorhaphis Parmeca (A. Massal.) Körb.
- Birchleaf Mountain Mahogany - Cercocarpus Montanus Raf. var. glaber (S. Watson) F.L. Martin
- Bird Beaksedge - Rhynchospora Filiformis Vahl
- Bird Clover - Trifolium Ornithopodioides L.
- Bird Spiderflower - Cleome Ornithopodioides L., nom. inq.
- Bird Vetch - Vicia Cracca L.
- Bird Vetch - Vicia Cracca L. ssp. cracca
- Bird's-beak - Cordylanthus Nutt. ex Benth.
- Bird's-eye Bush - Ochna Jabotapita L.
- Bird's-eye Cress - Myagrum Perfoliatum L.
- Bird's-eye Gilia - Gilia Tricolor Benth.
- Bird's-eye Gilia - Gilia Tricolor Benth. ssp. diffusa (Congd.) H. Mason & A.D. Grant
- Bird's-eye Gilia - Gilia Tricolor Benth. ssp. tricolor
- Bird's-foot - Ornithopus L.
- Bird's-foot Trefoil - Lotus Corniculatus L.
- Bird's-foot Trefoil - Lotus Corniculatus L. var. corniculatus
- Bird-of-paradise -tree - Strelitzia Nicolai Regel & Körn.
- Bird-of-paradise Shrub - Caesalpinia Gilliesii (Wall. ex Hook.) Wall. ex D. Dietr.
- Bird-of-paradise - Strelitzia Aiton
- Bird-of-paradise - Strelitzia Reginae Aiton
- Birdbill Dayflower - Commelina Dianthifolia Delile
- Birdbill Dayflower - Commelina Dianthifolia Delile var. dianthifolia
- Birdbill Dayflower - Commelina Dianthifolia Delile var. longispatha (Torr.) Brashier
- Birdbill Woodoats - Chasmanthium Ornithorhynchum (Steud.) Yates
- Birdcage Evening Primrose - Oenothera Deltoides Torr. & Frém.
- Birdcage Evening Primrose - Oenothera Deltoides Torr. & Frém. ssp. ambigua (S. Watson) W. Klein
- Birdcage Evening Primrose - Oenothera Deltoides Torr. & Frém. ssp. cognata (Jeps.) W. Klein
- Birdcage Evening Primrose - Oenothera Deltoides Torr. & Frém. ssp. deltoides
- Birdcatching Sedge - Uncinia Hamata (Sw.) Urb.
- Birdcatching Sedge - Uncinia Pers.
- Birdcherry - Eugenia Monticola (Sw.) DC.
- Birdeye Pearlwort - Sagina Procumbens L.
- Birdeye Primrose - Primula Laurentiana Fernald
- Birdeye Speedwell - Veronica Persica Poir.
- Birdflower - Crotalaria Cunninghamii R. Br.
- Birdfoot Checkerbloom - Sidalcea Pedata A. Gray
- Birdfoot Cliffbrake - Pellaea Mucronata (D.C. Eaton) D.C. Eaton
- Birdfoot Cliffbrake - Pellaea Mucronata (D.C. Eaton) D.C. Eaton ssp. mucronata
- Birdfoot Dimeria - Dimeria Ornithopoda Trin. var. tenera (Trin.) Hack.
- Birdfoot Sagebrush - Artemisia Pedatifida Nutt.
- Birdfoot Violet - Viola Pedata L.
- Birdnest Buckwheat - Eriogonum Nidularium Coville
- Birdnest Fern - Asplenium Polyodon G. Forst. var. nitidulum (Skottsb.) Morton
- Birdnest Fern - Asplenium Polyodon G. Forst. var. sectum (Hillebr.) Morton
- Birdnest Fern - Asplenium Polyodon G. Forst. var. subcaudatum (Skottsb.) Morton
- Birdnest Milkvetch - Astragalus Nidularius Barneby
- Birdseed Leaf-flower - Phyllanthus Pudens L.C. Wheeler
- Birdwing Fern - Campyloneurum Latum T. Moore
- Birdwing Passionflower - Passiflora Tenuiloba Engelm.
- Birdwing Treefern - Cyathea Borinquena (Maxon) Domin
- Birdwood Grass - Cenchrus Setiger Vahl
- Biriba - Rollinia Pulchrinervis A. DC.
- Birmingham Blackberry - Rubus Probativus L.H. Bailey
- Birthwort - Aristolochia Clematitis L.
- Bisbee Peak Rushrose - Helianthemum Scoparium Nutt.
- Bisbee Spinystar - Escobaria Vivipara (Nutt.) Buxbaum var. bisbeeana (Orcutt) D.R. Hunt
- Biscayne Pricklyash - Zanthoxylum Coriaceum A. Rich.
- Bischerad - Spathiphyllum Commutatum Schott
- Bischoff's Rinodina Lichen - Rinodina Bischoffii (Hepp) A. Massal.
- Biscuitroot - Lomatium Roseanum Cronquist
- Biserrula L.
- Biserrula Pelecinus L.
- Bishop - Bifora Hoffm.
- Bishop Pine - Pinus Muricata D. Don
- Bishop's Goutweed - Aegopodium Podagraria L.
- Bishop's Hat - Astrophytum Ornatum (DC.) Britton & Rose
- Bishop's Milkvetch - Astragalus Episcopus S. Watson
- Bishop's Milkvetch - Astragalus Episcopus S. Watson var. episcopus
- Bishop's Milkvetch - Astragalus Episcopus S. Watson var. lancearius (A. Gray) Isely
- Bishopwood - Bischofia Blume
- Bistort Cartilage Lichen - Ramalina Bistorta Nyl.
- Bistorta Bistortoides (Pursh) Small
- Bistorta Officinalis Delarbre
- Bistorta Plumosa (Small) Greene
- Bistorta Vivipara (L.) Gray
- Bithynian Vetch - Vicia Bithynica (L.) L.
- Bitter Ash - Picrasma Antillana (Eggers) Urb.
- Bitter Cherry - Prunus Emarginata (Douglas ex Hook.) D. Dietr.
- Bitter Cherry - Prunus Emarginata (Douglas ex Hook.) D. Dietr. var. emarginata
- Bitter Cherry - Prunus Emarginata (Douglas ex Hook.) D. Dietr. var. mollis (Douglas ex Hook.) W.H.
- Bitter Creek Phacelia - Phacelia Salina (A. Nelson) J.T. Howell
- Bitter Dock - Rumex Obtusifolius L.
- Bitter Fleabane - Erigeron Acris L.
- Bitter Fleabane - Erigeron Acris L. ssp. debilis (A. Gray) Piper
- Bitter Fleabane - Erigeron Acris L. ssp. kamtschaticus (DC.) H. Hara
- Bitter Fleabane - Erigeron Acris L. ssp. politus (Fr.) Schinz & R. Keller
- Bitter Ginger - Zingiber Zerumbet (L.) Sm.
- Bitter Gooseberry - Ribes Amarum McClatchie
- Bitter Lettuce - Lactuca Virosa L.
- Bitter Orange - Citrus Limetta Risso
- Bitter Panicgrass - Panicum Amarum Elliott
- Bitter Panicgrass - Panicum Amarum Elliott var. amarum
- Bitter Root Draba - Draba Daviesiae (C.L. Hitchc.) Rollins
- Bitter Root - Lewisia Rediviva Pursh
- Bitter Root - Lewisia Rediviva Pursh var. minor (Rydb.) Munz
- Bitter Root - Lewisia Rediviva Pursh var. rediviva
- Bitter Rubberweed - Hymenoxys Odorata DC.
- Bitter Snakewood - Condalia Globosa I.M. Johnst.
- Bitter Snakewood - Condalia Globosa I.M. Johnst. var. pubescens I.M. Johnst.
- Bitter Tree - Soulamea Amara Lam.
- Bitter Tube Lichen - Hypogymnia Bitteri (Lynge) Ahti
- Bitter Yam - Dioscorea Dumetorum (Kunth) Pax
- Bitterbrush - Purshia Dc. ex Poir.
- Bitterbush - Picramnia Sw.
- Bittercress - Cardamine L.
- Bittercress - Cardamine ×anomala (Eames) K. Schum. (pro sp.)
- Bittercress - Cardamine ×incisa (Eames) K. Schum. (pro sp.)
- Bittercress Ragwort - Packera Cardamine (Greene) W.A. Weber & Á. Löve
- Bitternut Hickory - Carya Cordiformis (Wangenh.) K. Koch
- Bitterroot Buckwheat - Eriogonum Chrysops Rydb.
- Bitterroot Milkvetch - Astragalus Scaphoides (M.E. Jones) Rydb.
- Bittersweet - Celastrus L.
- Bitterweed - Picris Sprengeriana (L.) Poir.
- Bitterwood - Picrasma Excelsa (Sw.) Planch.
- Bituminaria - Bituminaria Heist. ex Fabr.
- Biventraria Variegata (L.) Small
- Bivonea Stimulosa (Michx.) Raf.
- Bixa - Bixa L.
- Bkau - Maranthes Corymbosa Blume
- Blacheos - Gmelina Palawensis H.J. Lam
- Black Alpine Sedge - Carex Nigricans C.A. Mey.
- Black Ambret - Mimosa Ceratonia L.
- Black Apple - Diospyros Revoluta Poir.
- Black Ash - Fraxinus Nigra Marshall
- Black Bamboo - Phyllostachys Nigra (Lodd. ex Lindl.) Munro
- Black Baneberry - Actaea Racemosa L.
- Black Baneberry - Actaea Racemosa L. var. dissecta (A. Gray) J. Compton
- Black Beadfern - Hypolepis Nigrescens Hook.
- Black Bindweed - Polygonum Convolvulus L.
- Black Bindweed - Polygonum Convolvulus L. var. convolvulus
- Black Bindweed - Polygonum Convolvulus L. var. subulatum Lej. & Court.
- Black Bogrush - Schoenus Nigricans L.
- Black Booyong - Heritiera Actinophylla (F.M. Bailey) Kosterm.
- Black Bristlegrass - Setaria Nigrirostris (Nees) T. Dur. & Schinz
- Black Bugbane - Actaea Racemosa L. var. racemosa
- Black Calabash - Amphitecna Latifolia (Mill.) A.H. Gentry
- Black Canyon Gilia - Aliciella Penstemonoides (M.E. Jones) J.M. Porter
- Black Cherry - Prunus Serotina Ehrh.
- Black Cherry - Prunus Serotina Ehrh. var. eximia (Small) Little
- Black Cherry - Prunus Serotina Ehrh. var. rufula (Wooton & Standl.) McVaugh
- Black Cherry - Prunus Serotina Ehrh. var. serotina
- Black Cherry - Prunus Serotina Ehrh. var. virens (Wooton & Standl.) McVaugh
- Black Chokeberry - Aronia Melanocarpa (Michx.) Elliott
- Black Chokecherry - Prunus Virginiana L. var. melanocarpa (A. Nelson) Sarg.
- Black Coral-pea - Kennedia Nigricans Lindl.
- Black Cottonwood - Populus Balsamifera L. ssp. trichocarpa (Torr. & A. Gray ex Hook.) Brayshaw
- Black Crowberry - Empetrum Nigrum L.
- Black Crowberry - Empetrum Nigrum L. ssp. hermaphroditum (Lange ex Hagerup) Böcher
- Black Crowberry - Empetrum Nigrum L. ssp. nigrum
- Black Cumin - Nigella Sativa L.
- Black Cutch - Senegalia Catechu (L. f.) P.J.H. Hurter & Mabb.
- Black Damar - Canarium Strictum Roxb.
- Black Didymodon Moss - Didymodon Nigrescens (Mitt.) K. Saito
- Black Disc Lichen - Buellia Nigra (Fink) Sheard
- Black Dropseed - Sporobolus Interruptus Vasey
- Black Ebony - Diospyros Ferrea (Willd.) Bakh.
- Black Edge Sedge - Carex Nigromarginata Schwein.
- Black Elderberry - Sambucus Nigra L.
- Black Flatsedge - Cyperus Niger Ruiz & Pav.
- Black Fonio - Digitaria Iburua Stapf [excluded]
- Black Garlic - Allium Nigrum L.
- Black Golf Club Moss - Catoscopium Nigritum (Hedw.) Brid.
- Black Gram - Vigna Mungo (L.) Hepper
- Black Grama - Bouteloua Eriopoda (Torr.) Torr.
- Black Hawthorn - Crataegus Douglasii Lindl.
- Black Hellebore - Helleborus Niger L.
- Black Henbane - Hyoscyamus Niger L.
- Black Hickory - Carya Texana Buckley
- Black Highbush Blueberry - Vaccinium Fuscatum Aiton
- Black Hills Meadow-rue - Thalictrum Nigromontanum B. Boivin
- Black Horehound - Ballota Nigra L.
- Black Horehound - Ballota Nigra L. var. alba (L.) Sm.
- Black Horehound - Ballota Nigra L. var. foetida (Hayek) Vis.
- Black Horehound - Ballota Nigra L. var. nigra
- Black Huckleberry - Gaylussacia Baccata (Wangenh.) K. Koch
- Black Ironbox - Eucalyptus Raveretiana F. Muell.
- Black Juniper - Juniperus Wallichiana Hook. f. & Thomson ex Brandis
- Black Locust - Robinia Pseudoacacia L.
- Black Mampoo - Guapira Fragrans (Dum. Cours.) Little
- Black Mangrove - Avicennia Africana P. Beauv.
- Black Mangrove - Avicennia Germinans (L.) L.
- Black Mangrove - Lumnitzera Wild.
- Black Maple - Acer Nigrum Michx. f.
- Black Marlock - Eucalyptus Redunca Schauer
- Black Medick - Medicago Lupulina L.
- Black Mulberry - Morus Nigra L.
- Black Mullein - Verbascum Nigrum L.
- Black Mustard - Brassica Nigra (L.) W.D.J. Koch
- Black Nicker - Caesalpinia Monensis Britton
- Black Nightshade - Solanum Nigrum L.
- Black Oak - Quercus Velutina Lam.
- Black Oats - Avena Strigosa Schreb.
- Black Papillaria Moss - Papillaria Nigrescens (Hedw.) A. Jaeger
- Black Pepper - Piper Nigrum L.
- Black Peppermint - Eucalyptus Salicifolia (Sol.) Cav.
- Black Poui - Jacaranda Mimosifolia D. Don
- Black Prairie Clover - Dalea Frutescens A. Gray
- Black Psorotichia Lichen - Psorotichia Nigra H. Magn.
- Black Pyrenothrix Lichen - Pyrenothrix Nigra Riddle
- Black Rabbitsfoot Fern - Davallia Trichomanoides Blume
- Black Raspberry - Rubus Occidentalis L.
- Black River Beardtongue - Penstemon Putus A. Nelson
- Black Rock Townsend Daisy - Townsendia Smithii L.M. Shultz & A.H. Holmgren
- Black Rock Wild Cabbage - Caulanthus Barnebyi Rollins & P.K. Holmgren
- Black Sage - Cordia Curassavica (Jacq.) Roem. & Schult.
- Black Sage - Salvia Mellifera Greene
- Black Sagebrush - Artemisia Nova A. Nelson
- Black Salsify - Scorzonera Hispanica L.
- Black Sand Spikerush - Eleocharis Pachycarpa Desv.
- Black Sapote - Diospyros Digyna Jacq.
- Black Sedge - Carex Nova L.H. Bailey
- Black She-oak - Allocasuarina Littoralis (Salisb.) L.A.S. Johnson
- Black Spikerush - Eleocharis Nigrescens (Nees) Steud.
- Black Spleenwort - Asplenium Adiantum-nigrum L.
- Black Spruce - Picea Mariana (Mill.) Britton, Sterns & Poggenb.
- Black Sweetwood - Ocotea Foeniculacea Mez
- Black Vetch - Vicia Nigricans Hook. & Arn.
- Black Vetch - Vicia Nigricans Hook. & Arn. ssp. nigricans Hook. & Arn. [excluded]
- Black Vetivergrass - Vetiveria Nigritana (Benth.) Stapf
- Black Walnut - Juglans Nigra L.
- Black Wattle - Acacia Mearnsii De Wild.
- Black Willow - Salix Nigra Marshall
- Black-box - Eucalyptus Largiflorens F. Muell.
- Black-heads - Enneapogon Nigricans (R. Br.) P. Beauv.
- Black-sage - Cordia Polycephala (Lam.) I.M. Johnst.
- Blackandwhite Sedge - Carex Albonigra Mack.
- Blackbead - Pithecellobium Bahamense Northr.
- Blackbead - Pithecellobium Jiringa (W. Jack) Prain ex King
- Blackbead - Pithecellobium Mart.
- Blackberry For The Rest Of Us - Rubus Festivus P.J. Müll. & Wirtg. ex Focke
- Blackberry Lily - Belamcanda Chinensis (L.) DC.
- Blackberry - Rubus L.
- Blackberry - Rubus ×paracaulis L.H. Bailey (pro sp.)
- Blackbract Pipewort - Eriocaulon Nigrobracteatum Bridges & Orzell
- Blackbract Willow - Salix ×pedunculata Fernald (pro sp.)
- Blackbrush Acacia - Vachellia Rigidula (Benth.) Seigler & Ebinger
- Blackbrush - Coleogyne Ramosissima Torr.
- Blackbrush Wattle - Vachellia Anegadensis (Britton) Seigler & Ebinger [excluded]
- Blackbutt - Eucalyptus Patens Benth.
- Blackbutt - Eucalyptus Pilularis Sm.
- Blackcurly Lichen - Pseudephebe M. Choisy
- Blackcurly Lichen - Pseudephebe Minuscula (Nyl. ex Arnold) Brodo & D. Hawksw.
- Blackcurly Lichen - Pseudephebe Pubescens (L.) M. Choisy
- Blackdisk Medick - Medicago Orbicularis (L.) Bartal.
- Blackeyed Pea - Vigna Unguiculata (L.) Walp. ssp. dekindtiana (Harms) Verdc.
- Blackeyed Susan - Rudbeckia Hirta L.
- Blackeyed Susan - Rudbeckia Hirta L. var. angustifolia (T.V. Moore) Perdue
- Blackeyed Susan - Rudbeckia Hirta L. var. floridana (T.V. Moore) Perdue
- Blackeyed Susan - Rudbeckia Hirta L. var. hirta
- Blackeyed Susan - Rudbeckia Hirta L. var. pulcherrima Farw.
- Blackeyed Susan Vine - Thunbergia Alata Bojer ex Sims
- Blackfoot Groundsmoke - Gayophytum Racemosum Torr. & A. Gray
- Blackfoot - Melampodium L.
- Blackfoot Quillwort - Isoetes Melanopoda Gay & Durieu ex Durieu
- Blackfoot River Evening Primrose - Camissonia Andina (Nutt.) P.H. Raven
- Blackfoot Sandmat - Chamaesyce Angusta (Engelm.) Small
- Blackfruit Dogwood - Cornus Sessilis Torr. ex Durand
- Blackfruit Spikerush - Eleocharis Melanocarpa Torr.
- Blackgirdle Bulrush - Scirpus Atrocinctus Fernald
- Blackgum - Nyssa Sylvatica Marshall
- Blackhaw - Viburnum Prunifolium L.
- Blackhead Fleabane - Erigeron Melanocephalus (A. Nelson) A. Nelson
- Blackiella Conduplicata (F. Muell.) Aellen
- Blackish Locoweed - Oxytropis Nigrescens (Pall.) Fisch. ex DC. var. lonchopoda Barneby
- Blackish Oxytrope - Oxytropis Nigrescens (Pall.) Fisch. ex DC.
- Blackish Oxytrope - Oxytropis Nigrescens (Pall.) Fisch. ex DC. var. nigrescens
- Blackjack Oak - Quercus Marilandica Münchh.
- Blackjack Oak - Quercus Marilandica Münchh. var. ashei Sudw.
- Blackjack Oak - Quercus Marilandica Münchh. var. marilandica
- Blacklancewood - Oxandra Lanceolata (Sw.) Baill.
- Blackmat Splashzone Moss - Scouleria Aquatica Hook.
- Blackrodwood - Eugenia Biflora (L.) DC.
- Blackroot - Pterocaulon Elliott
- Blackroot Sedge - Carex Elynoides T. Holm
- Blackseed Plantain - Plantago Rugelii Decne.
- Blackseed Plantain - Plantago Rugelii Decne. var. asperula Farw.
- Blackseed Plantain - Plantago Rugelii Decne. var. rugelii
- Blackseed Ricegrass - Patis Racemosa (Sm.) Romasch., P.M. Peterson & R. J. Soreng
- Blackseed Sandspurry - Spergularia Atrosperma R.P. Rossb.
- Blackseed Speargrass - Piptochaetium Avenaceum (L.) Parodi
- Blackseed Spurge - Euphorbia Bilobata Engelm.
- Blacksenna - Seymeria Pursh
- Blackspore Oakfern - Gymnocarpium ×heterosporum W.H. Wagner (pro sp.)
- Blackspore Quillwort - Isoetes Melanospora Engelm.
- Blackspot Hornpoppy - Glaucium Corniculatum (L.) J.H. Rudolph
- Blackstem Spleenwort - Asplenium Resiliens Kunze
- Blackstem Twinsorus Fern - Diplazium Melanocaulon Brack.
- Blacktack Phacelia - Phacelia Pachyphylla A. Gray
- Blackthorn - Prunus Spinosa L.
- Blackthread Lichen - Placynthium (ach.) A. Gray
- Blackthread Lichen - Placynthium Asperellum (Ach.) Trevis.
- Blackthread Lichen - Placynthium Flabellosum (Tuck.) Zahlbr.
- Blackthread Lichen - Placynthium Nigrum (Huds.) A. Gray
- Blackthread Lichen - Placynthium Stenophyllum (Tuck.) Fink
- Blackthread Lichen - Placynthium Subradiatum (Nyl.) Arnold
- Blacktorch - Erithalis Fruticosa L.
- Blacktorch - Erithalis P. Br.
- Blackwood - Acacia Melanoxylon R. Br.
- Blackwood - Acacia Penninervis Sieber ex DC.
- Bladder Campion - Silene Latifolia Poir.
- Bladder Campion - Silene Latifolia Poir. ssp. alba (Mill.) Greuter & Burdet
- Bladder Pod - Lesquerella Palmeri S. Watson [excluded]
- Bladder Senna - Colutea Arborescens L.
- Bladder-senna - Colutea Istria Mill.
- Bladderfern - Cystopteris Bernh.
- Bladderfern - Cystopteris ×illinoensis R.C. Moran
- Bladderfern - Cystopteris ×wagneri R.C. Moran
- Bladdermallow - Herissantia Crispa (L.) Briz.
- Bladdernut - Staphylea L.
- Bladderpod - Lesquerella S. Watson
- Bladderpod - Lesquerella ×maxima (Rollins) Rollins
- Bladderpod Spiderflower - Cleome Isomeris Greene
- Bladdersage - Salazaria Torr.
- Bladderwort - Utricularia Bifida L.
- Bladderwort - Utricularia Caerulea L.
- Bladderwort - Utricularia Exoleta R. Br.
- Bladderwort - Utricularia L.
- Bladderwort - Utricularia Racemosa Wall.
- Bladderwort - Utricularia Uliginosa Vahl
- Blaine Fishhook Cactus - Sclerocactus Spinosior (Engelm.) Woodruff & L.D. Benson ssp. blainei (S.L. Welsh & Thor
- Blair's Wirelettuce - Stephanomeria Blairii Munz & I.M. Johnst.
- Blakley's Spineflower - Chorizanthe Blakleyi Hardham
- Blanchard's Dewberry - Rubus Blanchardianus (L.H. Bailey) L.H. Bailey
- Blanchard's Hawthorn - Crataegus Irrasa Sarg.
- Blandow's Helodium Moss - Helodium Blandowii (F. Weber & D. Mohr) Warnst.
- Blandow's Helodium Moss - Helodium Blandowii (F. Weber & D. Mohr) Warnst. var. blandowii
- Blandow's Helodium Moss - Helodium Blandowii (F. Weber & D. Mohr) Warnst. var. helodioides (Renauld & Cardot)
- Blanketflower - Gaillardia Aristata Pursh
- Blanketflower - Gaillardia Foug.
- Blanketflower - Gaillardia ×grandiflora Van Houtte
- Blanketleaf Willow - Salix Silicicola Raup
- Blasdale Bentgrass - Agrostis Blasdalei Hitchc.
- Blasia L.
- Blasia Pusilla L.
- Blastania Fimbristipula Kotschy & Peyr.
- Blastenia Diphasia (Tuck.) Zahlbr.
- Blastenia Novomexicana Fink
- Blastenia Rubrofusca de Lesd.
- Blazing Star - Liatris Aestivalis G.L. Nesom & R. O'Kennon
- Blazing Star - Liatris Gaertn. ex Schreb.
- Blazing Star - Liatris ×boykinii Torr. & A. Gray (pro sp.)
- Blazing Star - Liatris ×fallacior (Lunell) Rydb. (pro sp.)
- Blazing Star - Liatris ×frostii Gaiser
- Blazing Star - Liatris ×gladewitzii (Farw.) Farw. ex Shinners
- Blazing Star - Liatris ×ridgwayi Standl.
- Blazing Star - Liatris ×steelei Gaiser
- Blazing Star - Liatris ×weaveri Shinners
- Blazingstar - Mentzelia L.
- Bleached - Discocalyx Mezii Hosok.
- Bleached - Maesa Palauensis Mez
- Blechnum Indicum auct. non Burm.
- Blechnum Occidentale L. var. minor Hook.
- Blechnum Polypodioides (Sw.) Kuhn
- Blechnum Spicant (L.) Sm. ssp. nipponicum auct. non (Kunze) Á. Löve & D. Löve
- Blechnum Spicant (L.) Sm. var. elongatum (Hook.) B. Boivin
- Blechnum Underwoodianum (Broadh.) C. Chr. [excluded]
- Blechnum Unilaterale Sw.
- Blechnum Vulcanicum (Blume) Kuhn
- Blechum Blechum (L.) Millsp., nom. inval.
- Blechum - Blechum P. Br.
- Blechum Brownei Juss.
- Blechum Pyramidatum (Lam.) Urb.
- Bleeding Heart - Dicentra Bernh.
- Bleeding Heart - Lamprocapnos Endl.
- Bleeding Heart - Lamprocapnos Spectabilis (L.) Fukuhara
- Blemished Lichen - Phlyctis (wallr.) Flotow
- Blemished Lichen - Phlyctis Agelaea (Ach.) Flotow
- Blemished Lichen - Phlyctis Argena (Spreng.) Flotow
- Blemished Lichen - Phlyctis Speirea G. Merr.
- Blephariglotis Blephariglottis (Willd.) Rydb.
- Blephariglotis Chapmanii Small
- Blephariglotis Ciliaris (L.) Rydb.
- Blephariglotis Conspicua (Nash) Small
- Blephariglotis Cristata (Michx.) Raf.
- Blephariglotis Grandiflora (Bigelow) Rydb.
- Blephariglotis Lacera (Michx.) Farw.
- Blephariglotis Leucophaea (Nutt.) Farw.
- Blephariglotis Peramoena (A. Gray) Rydb.
- Blephariglotis Psycodes (L.) Rydb.
- Blepharipappus - Blepharipappus Hook.
- Blepharizonia - Blepharizonia Greene
- Blepharizonia - Blepharizonia Laxa Greene
- Blepharostoma (dumort. emend. Lindb.) Dumort.
- Blepharostoma Arachnoideum M. Howe
- Blepharostoma Trichophyllum (L.) Dumort.
- Blepharostoma Trichophyllum (L.) Dumort. ssp. brevirete (Bryhn & Kaal.) R.M. Schust.
- Blepharostoma Trichophyllum (L.) Dumort. ssp. trichophyllum
- Blessed Milkthistle - Silybum Marianum (L.) Gaertn.
- Blessed Thistle - Cnicus Benedictus L.
- Bletia - Bletia Ruiz & Pav.
- Bletilla - Bletilla Rchb. f.
- Blighia - Blighia K.d. Koenig
- Blind Pricklypear - Opuntia Rufida Engelm.
- Blind's Bryum Moss - Bryum Blindii Bruch & Schimp.
- Blindeyes - Papaver Dubium L.
- Blindia Moss - Blindia Bruch & Schimp.
- Blindia Polaris (Berggr.) I. Hagen
- Blinding Tree - Excoecaria Agallocha L.
- Blister Sedge - Carex Vesicaria L.
- Blister Vetch - Vicia Ervilia (L.) Willd. [excluded]
- Blistered Naval Lichen - Lasallia Papulosa (Ach.) Llano
- Blistered Navel Lichen - Lasallia Mérat
- Blistered Navel Lichen - Lasallia Pustulata (L.) Mérat
- Blisterwort - Ranunculus Recurvatus Poir.
- Blisterwort - Ranunculus Recurvatus Poir. var. recurvatus
- Blisterwort - Ranunculus Recurvatus Poir. var. tropicus (Griseb.) Fawc. & Rendle
- Blite Goosefoot - Chenopodium Capitatum (L.) Asch.
- Blitum Capitatum L.
- Blitum Chenopodioides L.
- Blitum Cristatum F. Muell.
- Blitum Hastatum Rydb.
- Blitum Virgatum L.
- Blochman's Erigeron - Erigeron Blochmaniae Greene
- Blochman's Larkspur - Delphinium Parryi A. Gray ssp. blochmaniae (Greene) F.H. Lewis & Epling
- Blochman's Liveforever - Dudleya Blochmaniae (Eastw.) Moran
- Blochman's Liveforever - Dudleya Blochmaniae (Eastw.) Moran ssp. blochmaniae
- Blochman's Liveforever - Dudleya Blochmaniae (Eastw.) Moran ssp. insularis (Moran) Moran
- Blodgett's Crowngrass - Paspalum Blodgettii Chapm.
- Blodgett's Sage - Salvia Micrantha Vahl var. blodgettii (Chapm.) Epling
- Blodgett's Silverbush - Argythamnia Blodgettii (Torr.) Chapm.
- Blodgett's Swallow-wort - Cynanchum Blodgettii (A. Gray) Shinners
- Blood Currant - Ribes Sanguineum Pursh var. deductum (Greene) Jeps.
- Blood Currant - Ribes Sanguineum Pursh var. glutinosum (Benth.) Loudon
- Blood Currant - Ribes Sanguineum Pursh var. melanocarpum (Greene) Jeps.
- Blood Iris - Iris Sanguinea Hornem.
- Blood Lichen - Mycoblastus Affinis (Schaerer) Schauer
- Blood Lichen - Mycoblastus Marginatus Degel.
- Blood Lichen - Mycoblastus Norman
- Blood Lichen - Mycoblastus Sanguinarius (L.) Norman
- Blood Panicgrass - Dichanthelium Consanguineum (Kunth) Gould & C.A. Clark
- Blood Sage - Salvia Coccinea P.J. Buchoz ex Etlinger
- Blood-flower - Scadoxus Multiflorus (Martyn) Raf. ssp. multiflorus
- Blood-red Pricklypear - Opuntia Sanguinea Proctor
- Blood-trumpet - Distictis Buccinatoria (DC.) A.H. Gentry
- Blooddrops - Adonis Annua L.
- Bloodflower - Asclepias Curassavica L.
- Bloodgrass - Isachne R. Br.
- Bloodleaf - Iresine P. Br.
- Bloodroot - Sanguinaria Canadensis L.
- Bloodroot - Sanguinaria L.
- Bloodstain Lichen - Haematomma A. Massal.
- Bloodtwig Dogwood - Cornus Sanguinea L.
- Bloodwoodtree - Haematoxylum Campechianum L.
- Bloody Butcher - Trillium Recurvatum Beck
- Bloody Geranium - Geranium Sanguineum L.
- Bloom Peak Dwarf-primrose - Douglasia Conservatorum Björk
- Bloomer's Aster - Symphyotrichum Campestre (Nutt.) G.L. Nesom var. bloomeri (A. Gray) G.L. Nesom
- Bloomer's Buttercup - Ranunculus Orthorhynchus Hook. var. bloomeri (S. Watson) L.D. Benson
- Bloomeria Aurea Kellogg
- Bloomeria Clevelandii S. Watson
- Blow Wives - Achyrachaena Mollis Schauer
- Blow Wives - Achyrachaena Schauer
- Blowout Beardtongue - Penstemon Haydenii S. Watson
- Blowout Grass - Redfieldia Flexuosa (Thurb.) Vasey
- Blowout Grass - Redfieldia Vasey
- Blue And White Daisybush - Osteospermum Ecklonis (DC.) Norl.
- Blue Ash - Fraxinus Quadrangulata Michx.
- Blue Birch - Betula ×caerulea Blanch. (pro sp.)
- Blue Birch - Betula ×caerulea Blanch. var. caerulea
- Blue Boneset - Tamaulipa Azurea (DC.) R.M. King & H. Rob.
- Blue Bugle - Ajuga Genevensis L.
- Blue Cohosh - Caulophyllum Thalictroides (L.) Michx.
- Blue Creek Stonecrop - Sedum Citrinum Zika
- Blue Crowngrass - Paspalum Caespitosum Flueggé
- Blue Daisy - Felicia Amelloides (L.) Voss
- Blue Diamond Cholla - Cylindropuntia ×multigeniculata (Clokey) Backeb. (pro sp.)
- Blue Dwarf Fleabane - Erigeron Elegantulus Greene
- Blue Elderberry - Sambucus Nigra L. ssp. cerulea (Raf.) R. Bolli
- Blue Eyed Mary - Collinsia Nutt.
- Blue Fenugreek - Trigonella Caerulea (L.) Ser.
- Blue Fieldmadder - Sherardia Arvensis L.
- Blue Fiestaflower - Pholistoma Auritum (Lindl.) Lilja
- Blue Fiestaflower - Pholistoma Auritum (Lindl.) Lilja var. auritum
- Blue Finger - Senecio Mandraliscae (Tineo) H. Jacobsen
- Blue Flax - Linum Perenne L.
- Blue Funnel Lily - Androstephium Coeruleum (Scheele) Greene
- Blue Gem - Craterostigma Plantagineum Hochst.
- Blue Giant Hyssop - Agastache Foeniculum (Pursh) Kuntze
- Blue Grama - Bouteloua Gracilis (Willd. ex Kunth) Lag. ex Griffiths
- Blue Hound's Tongue - Cynoglossum Creticum Mill.
- Blue Huckleberry - Gaylussacia Frondosa (L.) Torr. & A. Gray ex Torr.
- Blue Lawngrass - Garnotia Stricta Brongn.
- Blue Leadwood - Ceratostigma Plumbaginoides Bunge
- Blue Lettuce - Lactuca Tatarica (L.) C.A. Mey.
- Blue Lettuce - Lactuca Tatarica (L.) C.A. Mey. var. pulchella (Pursh) Breitung
- Blue Limestone Columbine - Aquilegia Jonesii Parry var. elatior (Standl.) Boothman
- Blue Lupine - Lupinus Pilosus L.
- Blue Maidencane - Amphicarpum Purshii Kunth
- Blue Milkwort - Polygala Barbeyana Chod.
- Blue Mistflower - Conoclinium Coelestinum (L.) DC.
- Blue Mountain Beardtongue - Penstemon Pennellianus D.D. Keck
- Blue Mountain Biscuitroot - Lomatium Oreganum (J.M. Coult. & Rose) J.M. Coult. & Rose
- Blue Mountain Buckwheat - Eriogonum Strictum Benth.
- Blue Mountain Buckwheat - Eriogonum Strictum Benth. ssp. proliferum (Torr. & A. Gray) S. Stokes
- Blue Mountain Buckwheat - Eriogonum Strictum Benth. ssp. proliferum (Torr. & A. Gray) S. Stokes var. anserinu
- Blue Mountain Buckwheat - Eriogonum Strictum Benth. ssp. proliferum (Torr. & A. Gray) S. Stokes var. glabrum
- Blue Mountain Buckwheat - Eriogonum Strictum Benth. ssp. proliferum (Torr. & A. Gray) S. Stokes var. prolifer
- Blue Mountain Buckwheat - Eriogonum Strictum Benth. ssp. strictum
- Blue Mountain Buttercup - Ranunculus Oresterus L.D. Benson
- Blue Mountain Catchfly - Silene Scaposa B.L. Rob.
- Blue Mountain Catchfly - Silene Scaposa B.L. Rob. var. scaposa
- Blue Mountain Milkvetch - Astragalus Reventus A. Gray
- Blue Mountain Onion - Allium Dictuon H. St. John
- Blue Mountain Prairie Clover - Dalea Ornata (Douglas ex Hook.) Eaton & J. Wright
- Blue Mountainheath - Phyllodoce Caerulea (L.) Bab.
- Blue Mudplantain - Heteranthera Limosa (Sw.) Willd.
- Blue Nodding Locoweed - Oxytropis Deflexa (Pall.) DC. var. sericea Torr. & A. Gray
- Blue Oak - Quercus Douglasii Hook. & Arn.
- Blue Orchid - Vanda Coerulea Griff. ex Lindl.
- Blue Paloverde - Parkinsonia Florida (Benth. ex A. Gray) S. Watson
- Blue Panicum - Panicum Antidotale Retz.
- Blue Penstemon - Penstemon Cyaneus Pennell
- Blue Plantain Lily - Hosta Ventricosa (Salisb.) Stearn
- Blue Potatobush - Lycianthes Rantonnetii (Carrière) Bitter
- Blue Pussyleaf - Nelsonia Canescens (Lam.) Spreng.
- Blue Pygmyflower - Monnina Wrightii A. Gray
- Blue Rattlesnake - Crotalaria Verrucosa L.
- Blue Ridge Bittercress - Cardamine Flagellifera O.E. Schulz
- Blue Ridge Bittercress - Cardamine Flagellifera O.E. Schulz var. flagellifera
- Blue Ridge Bittercress - Cardamine Flagellifera O.E. Schulz var. hugeri (Small) Rollins
- Blue Ridge Blueberry - Vaccinium Pallidum Aiton
- Blue Ridge Carrionflower - Smilax Lasioneura Hook.
- Blue Ridge Catchfly - Silene Ovata Pursh
- Blue Ridge Goldenrod - Solidago Spithamaea M.A. Curtis
- Blue Ridge Horsebalm - Collinsonia Serotina Walter
- Blue Ridge Sedge - Carex Lucorum Willd. ex Link
- Blue Ridge Sedge - Carex Lucorum Willd. ex Link var. austrolucorum J. Rettig
- Blue Ridge Sedge - Carex Lucorum Willd. ex Link var. lucorum
- Blue Ridge Shield Lichen - Heterodermia Neglecta Lendemer, R.C. Harris & E.A. Tripp
- Blue Ridge Skullcap - Scutellaria Arguta Buckley
- Blue Ridge St. Johnswort - Hypericum Mitchellianum Rydb.
- Blue Ridge Wakerobin - Trillium Stamineum Harbison
- Blue Sage - Salvia Pachyphylla Epling ex Munz
- Blue Sedge - Carex Glaucodea Tuck. ex Olney
- Blue Skin Lichen - Leptogium Azureum (Sw.) Mont.
- Blue Skullcap - Scutellaria Caerulea Moc. & Sessé
- Blue Skullcap - Scutellaria Lateriflora L.
- Blue Skullcap - Scutellaria Lateriflora L. var. lateriflora
- Blue Spikemoss - Selaginella Uncinata (Desv. ex Poir.) Spring
- Blue Spruce - Picea Pungens Engelm.
- Blue Threeawn - Aristida Purpurea Nutt. var. nealleyi (Vasey) Allred
- Blue Umbrella-sedge - Fuirena Coerulescens Steud.
- Blue Waterhyssop - Bacopa Caroliniana (Walter) B.L. Rob.
- Blue Waxweed - Cuphea Viscosissima Jacq.
- Blue Wild Indigo - Baptisia Australis (L.) R. Br.
- Blue Wild Indigo - Baptisia Australis (L.) R. Br. var. aberrans (Larisey) M. Mendenhall
- Blue Wild Indigo - Baptisia Australis (L.) R. Br. var. australis
- Blue Wild Indigo - Baptisia Australis (L.) R. Br. var. minor (Lehm.) Fernald
- Blue Wildrye - Elymus Glaucus Buckley
- Blue Wildrye - Elymus Glaucus Buckley ssp. glaucus
- Blue Wildrye - Elymus Glaucus Buckley ssp. virescens (Piper) Gould
- Blue Windflower - Anemone Oregana A. Gray
- Blue Windflower - Anemone Oregana A. Gray var. oregana
- Blue Wiss - Teramnus Labialis (L. f.) Spreng.
- Blue Woodruff - Asperula Arvensis L.
- Blue Woodsorrel - Oxalis Caerulea (Small) R. Knuth
- Blue-eyed Grass - Sisyrinchium L.
- Blue-flowerd Starviolet - Hedyotis Cyanantha Kurz
- Blue-fly Honeysuckle - Lonicera Emphyllocalyx Maxim.
- Blue-leaf Stringybark - Eucalyptus Agglomerata Maiden
- Blue-oxalis - Parochetus Communis Buch.-Ham. ex D. Don
- Blue-sage - Eranthemum Pulchellum Andrews
- Blue-tulip - Moraea Polystachya (Thunb.) Ker Gawl.
- Bluebead - Clintonia Borealis (Aiton) Raf.
- Bluebead - Clintonia Raf.
- Bluebell Bellflower - Campanula Rotundifolia L.
- Bluebell Creeper - Sollya Heterophylla Lindl.
- Bluebells - Mertensia Roth
- Blueberry Hawthorn - Crataegus Brachyacantha Sarg. & Engelm.
- Blueberry - Vaccinium L.
- Blueberry - Vaccinium ×atlanticum E.P. Bicknell (pro sp.)
- Blueberry - Vaccinium ×carolinianum Ashe (pro sp.)
- Blueberry - Vaccinium ×dobbinii Burnham (pro sp.)
- Blueberry - Vaccinium ×margarettiae Ashe (pro sp.)
- Blueberry - Vaccinium ×marianum S. Watson (pro sp.)
- Blueberry - Vaccinium ×nubigenum Fernald (pro sp.)
- Blueberry Willow - Salix Myrtillifolia Andersson
- Bluebill - Clematis Pitcheri Torr. & A. Gray
- Bluebill - Clematis Pitcheri Torr. & A. Gray var. dictyota (Greene) Dennis
- Bluebill - Clematis Pitcheri Torr. & A. Gray var. pitcheri
- Blueblossom - Ceanothus Thyrsiflorus Eschsch.
- Bluebonnet Lupine - Lupinus Palmeri S. Watson
- Bluebowls - Giliastrum (brand) Rydb.
- Bluebowls - Giliastrum Acerosum (A. Gray) Rydb.
- Bluebowls - Giliastrum Rigidulum (Benth.) Rydb.
- Bluebunch Wheatgrass - Pseudoroegneria Spicata (Pursh) Á. Löve
- Bluebunch Wheatgrass - Pseudoroegneria Spicata (Pursh) Á. Löve ssp. spicata
- Bluecrown Passionflower - Passiflora Caerulea L.
- Bluecup - Githopsis Nutt.
- Bluecurls - Trichostema L.
- Bluedevil - Echium Pustulatum Sm.
- Bluedicks - Dichelostemma Capitatum (Benth.) Alph. Wood
- Bluedicks - Dichelostemma Capitatum (Benth.) Alph. Wood ssp. capitatum
- Bluedicks - Dichelostemma Capitatum (Benth.) Alph. Wood ssp. pauciflorum (Torr.) G. Keator
- Bluedome Primrose - Primula Alcalina Cholewa & Douglass M. Hend.
- Blueeyed Grass - Sisyrinchium Implicatum E.P. Bicknell
- Blueeyed Grass - Sisyrinchium Tracyi E.P. Bicknell
- Blueflower Butterwort - Pinguicula Caerulea Walter
- Blueflower Eryngo - Eryngium Integrifolium Walter
- Bluefly Honeysuckle - Lonicera Caerulea L. var. cauriana (Fernald) B. Boivin
- Bluegrass - Poa Ammophila A.E. Porsild
- Bluegrass - Poa L.
- Bluegrass - Poa ×nematophylla Rydb. (pro sp.)
- Bluegreen Saltbush - Atriplex Nummularia Lindl.
- Bluehead Gilia - Gilia Capitata Sims
- Bluehead Gilia - Gilia Capitata Sims ssp. abrotanifolia (Nutt. ex Greene) V.E. Grant
- Bluehead Gilia - Gilia Capitata Sims ssp. capitata
- Bluehead Gilia - Gilia Capitata Sims ssp. chamissonis (Greene) V.E. Grant
- Bluehead Gilia - Gilia Capitata Sims ssp. pedemontana V.E. Grant
- Bluehead Gilia - Gilia Capitata Sims ssp. staminea (Greene) V.E. Grant
- Bluehead Gilia - Gilia Capitata Sims ssp. tomentosa (Eastw. ex Brand) V.E. Grant
- Bluehearts - Buchnera L.
- Bluejack Oak - Quercus Incana W. Bartram
- Bluejacket - Tradescantia Ohiensis Raf.
- Bluejoint - Calamagrostis Canadensis (Michx.) P. Beauv.
- Bluejoint - Calamagrostis Canadensis (Michx.) P. Beauv. var. canadensis
- Bluejoint - Calamagrostis Canadensis (Michx.) P. Beauv. var. langsdorffii (Link) Inman
- Bluejoint Panicgrass - Panicum Tenerum Bey. ex Trin.
- Blueleaf Beardtongue - Penstemon Glaucinus Pennell
- Blueleaf Honeysuckle - Lonicera Korolkowii Stapf
- Bluemink - Ageratum Houstonianum Mill.
- Bluepod Rockcress - Arabis Glaucovalvula M.E. Jones
- Bluestar - Amsonia Walter
- Bluestem - Andropogon Gayanus Kunth
- Bluestem - Andropogon L.
- Bluestem Beardtongue - Penstemon Cyanocaulis Payson
- Bluestem - Dichanthium Willem.
- Bluestem Pricklypoppy - Argemone Albiflora Hornem.
- Bluestem Pricklypoppy - Argemone Albiflora Hornem. ssp. albiflora
- Bluestem Pricklypoppy - Argemone Albiflora Hornem. ssp. texana G.B. Ownbey
- Bluestem Yucca - Yucca Guatemalensis Baker
- Bluet - Houstonia L.
- Bluethread - Burmannia L.
- Bluethread - Burmannia Ledermannii Jonk.
- Bluewater Fleabane - Erigeron Acomanus Spellenb. & P. Knight
- Bluewings - Torenia Fournieri Linden ex E. Fourn.
- Bluewitch Nightshade - Solanum Umbelliferum Eschsch.
- Bluewitch Nightshade - Solanum Umbelliferum Eschsch. var. umbelliferum
- Bluewitch - Solanum Umbelliferum Eschsch. var. glabrescens Torr.
- Bluewitch - Solanum Umbelliferum Eschsch. var. incanum Torr.
- Bluff Rockdaisy - Perityle Aglossa A. Gray
- Bluish Spikemoss - Selaginella Asprella Maxon
- Blumea - Blumea Lacera (Burm. f.) DC.
- Blumer Buckthorn - Frangula ×blumeri (Greene) Kartesz & Gandhi (pro sp.)
- Blumer's Draba - Draba Helleriana Greene var. blumeri C.L. Hitchc.
- Blunt Broom Sedge - Carex Tribuloides Wahlenb.
- Blunt Broom Sedge - Carex Tribuloides Wahlenb. var. sangamonensis Clokey
- Blunt Broom Sedge - Carex Tribuloides Wahlenb. var. tribuloides
- Blunt Chaff Flower - Achyranthes Mutica A. Gray
- Blunt Spikerush - Eleocharis Obtusa (Willd.) Schult.
- Blunt Tansymustard - Descurainia Obtusa (Greene) O.E. Schulz
- Blunt Tansymustard - Descurainia Obtusa (Greene) O.E. Schulz ssp. adenophora (Wooton & Standl.) Detling
- Blunt Tansymustard - Descurainia Obtusa (Greene) O.E. Schulz ssp. obtusa
- Blunt-leaf Cassia - Senna Artemisioides (Gaudich. ex DC.) Randell ssp. helmsii (Symon) Randell
- Bluntflower Rush - Juncus Subnodulosus Schrank
- Bluntleaf Bedstraw - Galium Obtusum Bigelow
- Bluntleaf Bedstraw - Galium Obtusum Bigelow ssp. australe Puff
- Bluntleaf Bedstraw - Galium Obtusum Bigelow ssp. filifolium (Wiegand) Puff
- Bluntleaf Bedstraw - Galium Obtusum Bigelow ssp. obtusum
- Bluntleaf Hayscented Fern - Dennstaedtia Obtusifolia (Willd.) T. Moore
- Bluntleaf Pondweed - Potamogeton Obtusifolius Mert. & W.D.J. Koch
- Bluntleaf Sandwort - Moehringia Lateriflora (L.) Fenzl
- Bluntleaf Silverbush - Argythamnia Stahlii Urb.
- Bluntleaf Spikemoss - Selaginella Mutica D.C. Eaton ex Underw.
- Bluntleaf Spikemoss - Selaginella Mutica D.C. Eaton ex Underw. var. limitanea Weath.
- Bluntleaf Spikemoss - Selaginella Mutica D.C. Eaton ex Underw. var. mutica
- Bluntleaf Spleenwort - Asplenium Obtusifolium L.
- Bluntleaf Waterleaf - Hydrophyllum Canadense L.
- Bluntleaf Yellowcress - Rorippa Curvipes Greene
- Bluntleaf Yellowcress - Rorippa Curvipes Greene var. curvipes
- Bluntleaf Yellowcress - Rorippa Curvipes Greene var. truncata (Jeps.) Rollins
- Bluntleaved Orchid - Platanthera Obtusata (Banks ex Pursh) Lindl.
- Bluntleaved Orchid - Platanthera Obtusata (Banks ex Pursh) Lindl. ssp. obtusata
- Bluntleaved Orchid - Platanthera Obtusata (Banks ex Pursh) Lindl. ssp. oligantha (Turcz.) Hultén
- Bluntlobe Cliff Fern - Woodsia Obtusa (Spreng.) Torr.
- Bluntlobe Cliff Fern - Woodsia Obtusa (Spreng.) Torr. ssp. obtusa
- Bluntlobe Cyanea - Cyanea Obtusa (A. Gray) Hillebr.
- Bluntlobe Grapefern - Botrychium Oneidense (Gilbert) House
- Bluntlobe Lupine - Lupinus Obtusilobus A. Heller
- Bluntpod Bundleflower - Desmanthus Obtusus S. Watson
- Bluntscale Bahia - Bahia Pedata A. Gray
- Bluntseed Sweetroot - Osmorhiza Depauperata Phil.
- Blushing Wild Buckwheat - Eriogonum Ursinum S. Watson var. erubescens Reveal & J.D.Knorr
- Blutaparon - Blutaparon Raf.
- Blysmopsis Rufa (Huds.) Oteng-Yeboah
- Blytt's Andreaea Moss - Andreaea Blyttii Schimp.
- Blytt's Bryum Moss - Bryum Axel-blyttii Kaur. ex Philib.
- Blytt's Calcareous Moss - Mnium Blyttii Bruch & Schimp.
- Blytt's Kiaeria Moss - Kiaeria Blyttii (Schimp.) Broth.
- Blyxa - Blyxa Noronha ex Thouars
- Blyxa - Blyxa Octandra Planch. ex Thw.
- Bngei - Polyscias Nodosa (Blume) Seem.
- Boas' Trematodon Moss - Trematodon Boasii Schof.
- Boat Thatching Grass - Hyparrhenia Cymbaria (L.) Stapf
- Boatlily - Tradescantia Spathacea Sw.
- Bobea Elatior Gaudich. var. brevipes (A. Gray) Hillebr.
- Bobea Elatior Gaudich. var. molokaiensis Rock
- Bobea Gaudichaudii (Cham. & Schltdl.) H. St. John & D.R. Herbst
- Bobea Hookeri Hillebr.
- Bobea Mannii Hillebr.
- Bobea Platypes Fosberg
- Bobtail Barley - Hordeum Intercedens Nevski
- Boccone's Clover - Trifolium Bocconei Savi
- Boccone's Sandspurry - Spergularia Bocconii (Scheele) Foucaud ex Merino
- Bocconia - Bocconia L.
- Bocconia Cordata Willd.
- Bocconia Japonica André
- Bochelauchererak - Hydriastele Palauensis (Becc.) W.J. Baker & Loo
- Bodie Hills Cusickiella - Cusickiella Quadricostata (Rollins) Rollins
- Bodie Hills Rockcress - Arabis Bodiensis Rollins
- Bodiera Penaea (L.) DC.
- Bodin's Milkvetch - Astragalus Bodinii Sheldon
- Bodywood - Bourreria Succulenta Jacq.
- Boebera Papposa (Vent.) Rydb. ex Britton
- Boechera Angustifolia (Nutt.) Dorn
- Boechera Brachycarpa (Torr. & A. Gray) Dorn
- Boechera Canadensis (L.) Al-Shehbaz
- Boechera Cobrensis (M.E. Jones) Dorn
- Boechera Collinsii (Fernald) Á. Löve & D. Löve
- Boechera Crandallii (B.L. Rob.) W.A. Weber
- Boechera Demissa (Greene) W.A. Weber
- Boechera Demissa (Greene) W.A. Weber var. languida (Rollins) Dorn
- Boechera Dentata (Raf.) Al-Shehbaz & Zarucchi
- Boechera Divaricarpa (A. Nelson) Á. Löve & D. Löve
- Boechera Drummondii (A. Gray) Á. Löve & D. Löve
- Boechera Exilis (A. Nelson) Dorn
- Boechera Fendleri (S. Watson) W.A. Weber
- Boechera Fendleri (S. Watson) W.A. Weber var. spatifolia (Rydb.) Dorn
- Boechera Fernaldiana (Rollins) W.A. Weber
- Boechera Goodrichii (S.L. Welsh) N.H. Holmgren
- Boechera Grahamii (Lehm.) Windham & Al-Shehbaz
- Boechera Gunnisoniana (Rollins) W.A. Weber
- Boechera Holboellii (Hornem.) Á. Löve & D. Löve
- Boechera Holboellii (Hornem.) Á. Löve & D. Löve var. collinsii (Fernald) Dorn
- Boechera Holboellii (Hornem.) Á. Löve & D. Löve var. pinetorum (Tidestr.) Dorn
- Boechera Holboellii (Hornem.) Á. Löve & D. Löve var. retrofracta (Graham) Dorn
- Boechera Holboellii (Hornem.) Á. Löve & D. Löve var. secunda (Howell) Dorn
- Boechera Laevigata (Muhl. ex Willd.) Al-Shehbaz
- Boechera Lemmonii (S. Watson) W.A. Weber
- Boechera Lemmonii (S. Watson) W.A. Weber var. drepanoloba (Greene) Dorn
- Boechera Lignifera (A. Nelson) W.A. Weber
- Boechera Lyallii (S. Watson) Dorn
- Boechera Microphylla (Nutt.) Dorn
- Boechera Microphylla (Nutt.) Dorn var. macounii (S. Watson) Rollins
- Boechera Microphylla (Nutt.) Dorn var. microphylla
- Boechera Missouriensis (Greene) Al-Shehbaz
- Boechera Nuttallii (B.L. Rob.) Dorn
- Boechera Oxylobula (Greene) W.A. Weber
- Boechera Pallidifolia (Rollins) W.A. Weber
- Boechera Pendulina (Greene) W.A. Weber
- Boechera Pendulina (Greene) W.A. Weber var. russeola (Rollins) Dorn
- Boechera Perennans (S. Watson) W.A. Weber
- Boechera Pulchra (M.E. Jones ex S. Watson) W.A. Weber
- Boechera Pulchra (M.E. Jones ex S. Watson) W.A. Weber ssp. pallens (M.E. Jones) W
- Boechera Pulchra (M.E. Jones ex S. Watson) W.A. Weber var. pallens (M.E. Jones) D
- Boechera Pusilla (Rollins) Dorn
- Boechera Retrofracta (Graham) Á. Löve & D. Löve
- Boechera Selbyi (Rydb.) W.A. Weber
- Boechera Shortii (Fernald) Al-Shehbaz
- Boechera Sparsiflora (Nutt.) Dorn
- Boechera Sparsiflora (Nutt.) Dorn var. subvillosa (S. Watson) Dorn
- Boechera Stricta (Graham) Al-Shehbaz
- Boechera Tenuis (Böcher) Á. Löve & D. Löve
- Boechera Vivariensis (S.L. Welsh) W.A. Weber
- Boechera Williamsii (Rollins) Dorn
- Boechera Williamsii (Rollins) Dorn var. saximontana (Rollins) Dorn
- Boechera Williamsii (Rollins) Dorn var. williamsii
- Boehmer's Cat's-tail - Phleum Phleoides (L.) H. Karst.
- Boehmeria Austrina Small
- Boehmeria Celebica Blume
- Boehmeria Cylindrica (L.) Sw. var. drummondiana (Weddell) Weddell
- Boehmeria Cylindrica (L.) Sw. var. scabra Porter
- Boehmeria Decurrens Small
- Boehmeria Densiflora Hook. & Arn.
- Boehmeria Drummondiana Weddell
- Boehmeria Grandis (Hook. & Arn.) A. Heller var. cuneata Skottsb.
- Boehmeria Grandis (Hook. & Arn.) A. Heller var. kauaiensis Skottsb.
- Boehmeria Scabra (Porter) Small
- Boehmeria Stipularis Weddell
- Boerhavia Albiflora Fosberg
- Boerhavia Albiflora Fosberg var. powelliae Fosberg
- Boerhavia Annulata Coville
- Boerhavia Caribaea Jacq.
- Boerhavia Diffusa L. var. gymnocarpa Heimerl
- Boerhavia Diffusa L. var. pseudotetrandra Heimerl
- Boerhavia Diffusa L. var. sandwicensis Heimerl
- Boerhavia Diffusa L. var. tetrandra (G. Forst.) Heimerl
- Boerhavia Erecta L. var. intermedia (M.E. Jones) Kearney & Peebles
- Boerhavia Eriosolena A. Gray
- Boerhavia Glabrata Blume
- Boerhavia Gypsophiloides (M. Martens & Galeotti) J.M. Coult.
- Boerhavia Leiosolena Torr.
- Boerhavia Lindheimeri Standl.
- Boerhavia Tenuifolia A. Gray
- Boerhavia Tetrandra G. Forst.
- Boerhavia Torreyana (S. Watson) Standl.
- Boesenbergia - Boesenbergia Kuntze
- Bog Adder's-mouth Orchid - Malaxis Paludosa (L.) Sw.
- Bog Alkaligrass - Puccinellia Parishii Hitchc.
- Bog Anemone - Anemone Oregana A. Gray var. felix (M. Peck) C.L. Hitchc.
- Bog Aster - Oclemena Nemoralis (Aiton) Greene
- Bog Beggarticks - Bidens Conjuncta Sherff
- Bog Birch - Betula Pumila L.
- Bog Birch - Betula Pumila L. var. glabra Regel
- Bog Birch - Betula Pumila L. var. glandulifera Regel
- Bog Birch - Betula Pumila L. var. pumila
- Bog Birch - Betula Pumila L. var. renifolia Fernald
- Bog Blueberry - Vaccinium Uliginosum L.
- Bog Bluegrass - Poa Paludigena Fernald & Wiegand
- Bog Bulrush - Schoenoplectiella Mucronata (L.) J. Jung & H.K. Choi
- Bog Chickweed - Stellaria Alsine Grimm
- Bog Clermontia - Clermontia Grandiflora Gaudich.
- Bog Clermontia - Clermontia Grandiflora Gaudich. ssp. grandiflora
- Bog Clermontia - Clermontia Grandiflora Gaudich. ssp. maxima Lammers
- Bog Clermontia - Clermontia Grandiflora Gaudich. ssp. munroi (H. St. John) Lammers
- Bog Colicwood - Myrsine Denticulata (Wawra) Hosaka
- Bog Cyrtandra - Cyrtandra Procera Hillebr.
- Bog Dewberry - Rubus Hispidoides L.H. Bailey
- Bog Dubautia - Dubautia Imbricata H. St. John & G.D. Carr
- Bog Dubautia - Dubautia Imbricata H. St. John & G.D. Carr ssp. acronaea G.D. Carr
- Bog Dubautia - Dubautia Imbricata H. St. John & G.D. Carr ssp. imbricata
- Bog Fern - Thelypteris Simulata (Davenport) Nieuwl.
- Bog Goldenrod - Solidago Uliginosa Nutt.
- Bog Goldenrod - Solidago Uliginosa Nutt. var. levipes (Fernald) Fernald
- Bog Goldenrod - Solidago Uliginosa Nutt. var. linoides (Torr. & A. Gray) Fernald
- Bog Goldenrod - Solidago Uliginosa Nutt. var. terrae-novae (Torr. & A. Gray) Fernald
- Bog Goldenrod - Solidago Uliginosa Nutt. var. uliginosa
- Bog Hair Grass - Deschampsia Setacea (Huds.) Hack.
- Bog Korthal Mistletoe - Korthalsella Remyana v. Tiegh.
- Bog Labordia - Labordia Hedyosmifolia Baill.
- Bog Labrador Tea - Ledum Groenlandicum Oeder
- Bog Laurel - Kalmia Polifolia Wangenh.
- Bog Lobelia - Lobelia Gloria-montis Rock
- Bog Mirrorplant - Coprosma Elliptica W.R.B. Oliv.
- Bog Muhly - Muhlenbergia Uniflora (Muhl.) Fernald
- Bog Orchid - Habenaria Rodeiensis Barb. Rodr.
- Bog Orchid - Habenaria Willd.
- Bog Orchid - Pseudorchis Ség.
- Bog Pimpernel - Anagallis Tenella (L.) L.
- Bog Rosemary - Andromeda L.
- Bog Rosemary - Andromeda Polifolia L.
- Bog Rosemary - Andromeda Polifolia L. var. glaucophylla (Link) DC.
- Bog Rosemary - Andromeda Polifolia L. var. polifolia
- Bog Rosemary - Andromeda ×jamesiana Lepage
- Bog Rosette Grass - Dichanthelium Hillebrandianum (Hitchc.) C.A. Clark & Gould
- Bog Rush - Juncus Biflorus Elliott
- Bog Sedge - Kobresia Willd.
- Bog Smartweed - Polygonum Setaceum Baldw.
- Bog Spicebush - Lindera Subcoriacea B.E. Wofford
- Bog Stenogyne - Stenogyne Calaminthoides A. Gray
- Bog Stitchwort - Minuartia Stricta (Sw.) Hiern.
- Bog White Violet - Viola Lanceolata L.
- Bog White Violet - Viola Lanceolata L. ssp. lanceolata
- Bog White Violet - Viola Lanceolata L. ssp. occidentalis (A. Gray) N.H. Russell
- Bog White Violet - Viola Lanceolata L. ssp. vittata (Greene) N.H. Russell
- Bog Willow - Salix Pedicellaris Pursh
- Bog Willowherb - Epilobium Leptophyllum Raf.
- Bog Yellowcress - Rorippa Palustris (L.) Besser
- Bog Yellowcress - Rorippa Palustris (L.) Besser ssp. palustris
- Bog Yelloweyed Grass - Xyris Difformis Chapm.
- Bog Yelloweyed Grass - Xyris Difformis Chapm. var. difformis
- Bogbutton - Lachnocaulon Kunth
- Bogbutton - Sclerolepis Cass.
- Bogenhardia Crispa (L.) Kearney
- Boggs Lake Dodder - Cuscuta Howelliana P. Rubtzov
- Boggs Lake Hedgehyssop - Gratiola Heterosepala H. Mason & Bacig.
- Bogmat - Wolffiella Hegelm.
- Bogrush - Schoenus Calostachyus Poir.
- Bogrush - Schoenus L.
- Bogrush - Schoenus Tendo Banks & Sol. ex Hook. f.
- Bohemian Knotweed - Polygonum ×bohemicum (J. Chrtek & Chrtková) Zika & Jacobson
- Bois Bande - Jacquinia Berteroi Spreng.
- Boisduvalia Cleistogama Curran
- Boisduvalia Densiflora (Lindl.) S. Watson
- Boisduvalia Densiflora (Lindl.) S. Watson var. pallescens Suksd.
- Boisduvalia Densiflora (Lindl.) S. Watson var. salicina (Nutt. ex Torr. & A. Gray) Munz
- Boisduvalia Glabella (Nutt.) Walp.
- Boisduvalia Glabella (Nutt.) Walp. var. campestris (Jeps.) Jeps.
- Boisduvalia Macrantha A. Heller
- Boisduvalia Pallida Eastw.
- Boisduvalia Pygmaea (Speg.) Munz
- Boisduvalia Salicina (Nutt. ex Torr. & A. Gray) Rydb.
- Boisduvalia Stricta (A. Gray) Greene
- Boise Milkvetch - Astragalus Adanus A. Nelson
- Boissier's Clover - Trifolium Boissieri Guss. ex Soy.-Will. & Godr.
- Boivin's Rockcress - Arabis Boivinii G. Mulligan
- Boje - Torralbasia Cuneifolia (C. Wright) Krug & Urb.
- Bola De Nieve - Ixora Acuminata Roxb.
- Bolack's Sand Verbena - Abronia Bolackii N.D. Atwood, S.L. Welsh & K.D. Heil
- Bolander Beach Pine - Pinus Contorta Douglas ex Loudon var. bolanderi (Parl.) Vasey
- Bolander's Bedstraw - Galium Bolanderi A. Gray
- Bolander's Bluegrass - Poa Bolanderi Vasey
- Bolander's Brachythecium Moss - Brachythecium Bolanderi (Lesq.) A. Jaeger
- Bolander's Bruchia Moss - Bruchia Bolanderi Lesq.
- Bolander's Cladidium Lichen - Cladidium Bolanderi (Tuck.) B.D. Ryan
- Bolander's Claopodium Moss - Claopodium Bolanderi Best
- Bolander's Entosthodon Moss - Entosthodon Bolanderi Lesq.
- Bolander's Hawkweed - Hieracium Bolanderi A. Gray
- Bolander's Knotweed - Polygonum Bolanderi W.H. Brewer
- Bolander's Lily - Lilium Bolanderi S. Watson
- Bolander's Linanthus - Leptosiphon Bolanderi (A. Gray) J.M. Porter & L.A. Johnson
- Bolander's Madia - Kyhosia Bolanderi (A. Gray) B.G. Baldw.
- Bolander's Map Lichen - Rhizocarpon Bolanderi (Tuck.) Herre
- Bolander's Milkvetch - Astragalus Bolanderi A. Gray
- Bolander's Mock Dandelion - Phalacroseris Bolanderi A. Gray
- Bolander's Mock Dandelion - Phalacroseris Bolanderi A. Gray var. bolanderi
- Bolander's Mock Dandelion - Phalacroseris Bolanderi A. Gray var. coronata H.M. Hall
- Bolander's Monkeyflower - Mimulus Bolanderi A. Gray
- Bolander's Mule-ears - Agnorhiza Bolanderi (A. Gray) W.A. Weber
- Bolander's Onion - Allium Bolanderi S. Watson
- Bolander's Onion - Allium Bolanderi S. Watson var. bolanderi
- Bolander's Onion - Allium Bolanderi S. Watson var. mirabile (L.F. Hend.) McNeal
- Bolander's Onion - Allium Bolanderi S. Watson var. stenanthum (E. Drew) Jeps.
- Bolander's Orthotrichum Moss - Orthotrichum Bolanderi Sull.
- Bolander's Pea - Lathyrus Vestitus Nutt. ssp. bolanderi (S. Watson) C.L. Hitchc.
- Bolander's Peltula Lichen - Peltula Bolanderi (Tuck.) Wetmore
- Bolander's Phacelia - Phacelia Bolanderi A. Gray
- Bolander's Pohlia Moss - Pohlia Bolanderi (Sull.) Broth.
- Bolander's Pohlia Moss - Pohlia Bolanderi (Sull.) Broth. var. bolanderi
- Bolander's Pohlia Moss - Pohlia Bolanderi (Sull.) Broth. var. seriata Shaw
- Bolander's Quillwort - Isoetes Bolanderi Engelm.
- Bolander's Ragwort - Packera Bolanderi (A. Gray) W.A. Weber & Á. Löve
- Bolander's Ragwort - Packera Bolanderi (A. Gray) W.A. Weber & Á. Löve var. bolanderi
- Bolander's Reedgrass - Calamagrostis Bolanderi Thurb.
- Bolander's Rinodina Lichen - Rinodina Bolanderi H. Magn.
- Bolander's Rush - Juncus Bolanderi Engelm.
- Bolander's Sedge - Carex Bolanderi Olney
- Bolander's Silene - Silene Hookeri Nutt. ssp. bolanderi (A. Gray) Abrams
- Bolander's Spikerush - Eleocharis Bolanderi A. Gray
- Bolander's Tortula Moss - Tortula Bolanderi (Lesq.) Howe
- Bolander's Water-starwort - Callitriche Heterophylla Pursh ssp. bolanderi (Hegelm.) Calder & Roy L. Taylor
- Bolander's Woodland-star - Lithophragma Bolanderi A. Gray
- Bolander's Woodreed - Cinna Bolanderi Scribn.
- Bolander's Yampah - Perideridia Bolanderi (A. Gray) A. Nelson & J.F. Macbr.
- Bolander's Yampah - Perideridia Bolanderi (A. Gray) A. Nelson & J.F. Macbr. ssp. bolanderi
- Bolander's Yampah - Perideridia Bolanderi (A. Gray) A. Nelson & J.F. Macbr. ssp. involucrata T.I. Chuang &
- Bolandra Oregana S. Watson var. imnahaensis M. Peck
- Bolbitis Cladorrhizans (Spreng.) Ching
- Bolbitis Quoyana (Gaudich.) Ching
- Bolbophyllaria Pachyrachis (A. Rich.) Rchb. f.
- Bolboschoenus Maritimus (L.) Palla ssp. fluviatilis (Torr.) Á. Löve & D. Löve
- Bolboschoenus Maritimus (L.) Palla ssp. paludosus (A. Nelson) Á. Löve & D. Löve, nom. il
- Bolboschoenus Maritimus (L.) Palla var. paludosus (A. Nelson) Dorn
- Bolboschoenus Maritimus (L.) Palla var. polyphyllus (Boeckeler) Dorn
- Bolboschoenus Paludosus (A. Nelson) Soó
- Bolboxalis Cernua (Thunb.) Small
- Boldingh's Dodder - Cuscuta Boldinghii Urb.
- Boldo - Peumus Boldus Molina
- Boleko Nut - Ongokea Gore (Hua) Pierre
- Bolinas Manzanita - Arctostaphylos Virgata Eastw.
- Bolivar Brosimum - Brosimum Alicastrum Sw. ssp. bolivarense (Pitt.) C.C. Berg
- Bolivian Burhead - Echinodorus Bolivianus (Rusby) Holm-Niesen
- Bolivian Fuchsia - Fuchsia Boliviana Carrière
- Bolivian Panicgrass - Panicum Boliviense Hack.
- Bolivian Walnut - Juglans Boliviana (C. DC.) Dode
- Bollean Mistletoe - Phoradendron Bolleanum (Seem.) Eichl.
- Bolo Bolo - Clappertonia Ficifolia (Willd.) Decne.
- Bolophyta Alpina Nutt.
- Bolophyta Ligulata (M.E. Jones) W.A. Weber
- Bolophyta Tetraneuris (Barneby) W.A. Weber
- Boltonia Asteroides (L.) L'Hér. var. decurrens (Torr. & A. Gray) Fernald
- Boltonia Asteroides (L.) L'Hér. var. glastifolia (Hill) Fernald
- Boltonia Interior (Fernald & Grisc.) G.N. Jones
- Boltonia Latisquama A. Gray
- Boltonia Latisquama A. Gray var. decurrens (Torr. & A. Gray) Fernald & Grisc.
- Boltonia Latisquama A. Gray var. microcephala Fernald & Grisc.
- Boltonia Latisquama A. Gray var. occidentalis A. Gray
- Boltonia Latisquama A. Gray var. recognita Fernald & Grisc.
- Boltonia Lautureana Debeaux
- Boltonia Ravenelii Fernald & Grisc.
- Boltonia Recognita (Fernald & Grisc.) G.N. Jones
- Bomarea - Bomarea Mirb.
- Bomarea Kalbreyeri Baker
- Bombax Ellipticum Kunth
- Bombax Malabaricum DC.
- Bombax Pentandrum L.
- Bombax Vitifolium Willd.
- Bombycilaena (dc.) Smoljan. [excluded]
- Bombycilaena Californica (Fisch. & C.A. Mey.) Holub
- Bombycilaena Californica (Fisch. & C.A. Mey.) Holub var. californica
- Bombycilaena Californica (Fisch. & C.A. Mey.) Holub var. subvestita (A. Gray) Kartesz, in
- Bombyliospora Domingensis (Pers.) Zahlbr.
- Bombyliospora Pachycheila (Tuck.) Zahlbr.
- Bombyliospora Porphyritis (Tuck.) A. Massal.
- Bombyliospora Tuberculosa (Fée) De Not.
- Bombyliospora Vulpina (Nyl.) J.M. Burgess, nom. inval.
- Bommeria Fern - Bommeria Fourn.
- Bonamia Abdita (Myint) R.W. Long
- Bonamia Aquatica (Walter) A. Gray
- Bonamia Humistrata (Walter) A. Gray
- Bonamia Menziesii A. Gray var. rockii Myint
- Bonamia Michauxii (Fernald & B.G. Schub.) K.A. Wilson
- Bonamia Patens (Desr.) Shinners
- Bonamia Patens (Desr.) Shinners var. angustifolia (Nash) Shinners
- Bonamia Pickeringii (Torr. ex M.A. Curtis) A. Gray
- Bonamia Villosa (Nash) K.A. Wilson
- Bonaveria Securidaca (L.) Rchb.
- Bonavist-bean - Lablab Purpureus (L.) Sweet ssp. purpureus
- Bonebract Amaranth - Amaranthus Scleropoides Uline & Bray
- Bonebract - Sclerocarpus Jacq.
- Boneset - Tamaulipa R.m. King & H. Rob.
- Bonjean's Dicranum Moss - Dicranum Bonjeanii De Not.
- Bonnet Orchid - Pleurothallis R. Br.
- Bonnet Orchid - Trichosalpinx Luer
- Bonneville Big Sagebrush - Artemisia Tridentata Nutt. ssp. ×bonnevillensis H. Garrison, L. Schultz, & E.D. McArt
- Bonneville Pea - Lathyrus Brachycalyx Rydb.
- Bonneville Pea - Lathyrus Brachycalyx Rydb. ssp. brachycalyx
- Bonneville Saltbush - Atriplex Bonnevillensis C.A. Hanson
- Bonneville Shootingstar - Dodecatheon Conjugens Greene
- Bonneville Shootingstar - Dodecatheon Conjugens Greene ssp. conjugens
- Bonneville Shootingstar - Dodecatheon Conjugens Greene ssp. viscidum (Piper) H.J. Thomp.
- Bonny Doon Manzanita - Arctostaphylos Silvicola Jeps. & Wies. ex Jeps.
- Bonpland Willow - Salix Bonplandiana Kunth
- Bonpland's Croton - Croton Bonplandianus Baill.
- Bonpland's Scribble Lichen - Opegrapha Bonplandii Fée
- Bonsey's Hollyfern - Polystichum Bonseyi W.H. Wagner & Hobdy
- Bontia - Bontia L.
- Boojum Tree - Fouquieria Columnaris (Kellogg) Kellogg ex Curran
- Book-leaf Mallee - Eucalyptus Kruseana F. Muell.
- Boom's Quillwort - Isoetes Boomii N. Luebke
- Booth's Evening Primrose - Camissonia Boothii (Douglas ex Lehm.) P.H. Raven
- Booth's Evening Primrose - Camissonia Boothii (Douglas ex Lehm.) P.H. Raven ssp. intermedia (Munz) P.H. Raven
- Booth's Suncup - Camissonia Boothii (Douglas ex Lehm.) P.H. Raven ssp. boothii
- Booth's Willow - Salix Boothii Dorn
- Boott's Goldenrod - Solidago Arguta Aiton var. boottii (Hook.) Palmer & Steyerm.
- Boott's Sedge - Carex Picta Steud.
- Boquillas Sandmat - Chamaesyce Golondrina (L.C. Wheeler) Shinners
- Borage - Borago L.
- Borassus Palm - Borassus L.
- Boraxweed - Nitrophila Occidentalis (Moq.) S. Watson
- Borbonia Pinifolia Marloth
- Border Creepingfern - Odontosoria Scandens (Desv.) C. Chr.
- Border Fleabane - Erigeron Vicinus G.L. Nesom
- Border Horkelia - Horkelia Bolanderi A. Gray
- Border Pinyon - Pinus Discolor D.K. Bailey & Hawksw.
- Border Pricklypear - Opuntia Atrispina Griffiths
- Border Privet - Ligustrum Obtusifolium Siebold & Zucc.
- Boreal Bedstraw - Galium Kamtschaticum Steller ex Schult. & Schult. f.
- Boreal Bog Sedge - Carex Magellanica Lam.
- Boreal Bog Sedge - Carex Magellanica Lam. ssp. irrigua (Wahlenb.) Hultén
- Boreal Bog Sedge - Carex Magellanica Lam. ssp. magellanica Lam. [excluded]
- Boreal Carnation - Dianthus Repens Willd.
- Boreal Catchfly - Silene Soczaviana (Schischkin) Bocquet
- Boreal Chickweed - Cerastium Biebersteinii DC.
- Boreal Cup Lichen - Cladonia Borealis S. Stenroos
- Boreal Draba - Draba Borealis DC.
- Boreal Fescue - Festuca Hyperborea Holmen ex Frederiksen
- Boreal Fleabane - Erigeron Borealis (Vierh.) Simms
- Boreal Locoweed - Oxytropis Borealis DC.
- Boreal Locoweed - Oxytropis Borealis DC. var. australis S.L. Welsh
- Boreal Locoweed - Oxytropis Borealis DC. var. borealis
- Boreal Locoweed - Oxytropis Borealis DC. var. sulphurea (A.E. Porsild) S.L. Welsh
- Boreal Map Lichen - Rhizocarpon Superficiale (Schaerer) Vain. ssp. boreale Runem.
- Boreal Orange Lichen - Caloplaca Borealis (Vain.) Poelt
- Boreal Phlox - Phlox Sibirica L. ssp. borealis (Wherry) Shetler
- Boreal Primrose - Primula Anvilensis S. Kelso
- Boreal Sagebrush - Artemisia Arctica Less.
- Boreal Sagebrush - Artemisia Arctica Less. ssp. arctica
- Boreal Sagebrush - Artemisia Arctica Less. ssp. beringensis (Hultén) Hultén
- Boreal Sagebrush - Artemisia Arctica Less. ssp. comata (Rydb.) Hultén
- Boreal Starwort - Stellaria Borealis Bigelow
- Boreal Starwort - Stellaria Borealis Bigelow ssp. borealis
- Boreal Yarrow - Achillea Millefolium L. var. borealis (Bong.) Farw.
- Borinda - Borinda Stapleton
- Bornean Ironwood - Eusideroxylon Lauriflora (Blanco) J. Schultze-Motel
- Borneo Camphor - Dryobalanops Aromatica C.F. Gaertn.
- Borneo Syngramma - Syngramma Borneensis (Hook.) J. Sm.
- Bornholm's Bryum Moss - Bryum Bornholmense Winkelm. & Ruthe
- Boronia - Boronia Sm.
- Borrego Bedstraw - Galium Angustifolium Nutt. ex A. Gray ssp. borregoense Dempster & Stebbins
- Borrego Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. borreganus M.E. Jones
- Borreria Alata (Aubl.) DC.
- Borreria Brachysepala Urb.
- Borreria Capitata (Ruiz & Pav.) DC. var. tenella (Kunth) Steyerm.
- Borreria Densiflora DC.
- Borreria Laevis (Lam.) Griseb. var. sintenisii Urb.
- Borreria Laevis auct. non (Lam.) Griseb.
- Borreria Ocymoides auct. non (Burm. f.) DC.
- Borreria Repens auct. non DC.
- Borreria Tenella (Kunth) Cham. & Schltdl.
- Borreria Terminalis Small
- Borreria Verticillata (L.) G. Mey.
- Borsch Stonecrop - Sedum Borschii (R.T. Clausen) R.T. Clausen
- Bory's Cup Lichen - Cladonia Boryi Tuck.
- Borya Distichophylla Nutt.
- Borzicactus - Borzicactus Riccob.
- Borzicactus Icosagonus (Kunth) Britton & Rose
- Bosc's Mille Graines - Oldenlandia Boscii (DC.) Chapm.
- Bosc's Panicgrass - Dichanthelium Boscii (Poir.) Gould & C.A. Clark
- Boscia - Boscia Lam.
- Bosnian Pine - Pinus Leucodermis Antoine
- Bossiaea Buxifolia A. Cunn.
- Bossiaea Foliosa A. Cunn.
- Bossiaea Vent.
- Bostock's Minerslettuce - Montia Bostockii (A.E. Porsild) S.L. Welsh
- Boston Ivy - Parthenocissus Tricuspidata (Siebold & Zucc.) Planch.
- Boston Swordfern - Nephrolepis Exaltata (L.) Schott
- Boston Swordfern - Nephrolepis Exaltata (L.) Schott ssp. exaltata
- Boston Swordfern - Nephrolepis Exaltata (L.) Schott ssp. hawaiiensis W.H. Wagner
- Boswellia - Boswellia Roxb. ex Colebr.
- Boswellia Carteri Birdw.
- Boswellia Glabra Roxb.
- Bothriochloa Ambigua S.T. Blake [excluded]
- Bothriochloa Barbinodis (Lag.) Herter var. palmeri (Hack.) de Wet
- Bothriochloa Barbinodis (Lag.) Herter var. perforata (Trin. ex Fourn.) Gould
- Bothriochloa Bladhii (Retz.) S.T. Blake ssp. glabra (Roxb.) B.K. Simon
- Bothriochloa Caucasica (Trin.) C.E. Hubbard
- Bothriochloa Decipiens (Hack.) C.E. Hubbard [excluded]
- Bothriochloa Erianthoides (F. Muell.) C.E. Hubbard [excluded]
- Bothriochloa Glabra (Roxb.) A. Camus
- Bothriochloa Hassleri (Hack.) Cabrera
- Bothriochloa Intermedia (R. Br.) A. Camus
- Bothriochloa Palmeri (Hack.) Gould
- Bothriochloa Saccharoides (Sw.) Rydb. var. longipaniculata (Gould) Gould
- Bothriochloa Saccharoides (Sw.) Rydb. var. torreyana (Steud.) Gould
- Bothriospermum - Bothriospermum Bunge
- Boton De Oro - Melampodium Divaricatum (Rich.) DC.
- Botrychium Alabamense Maxon
- Botrychium Alaskense W.H. Wagner & J.R. Grant
- Botrychium Angustisegmentum (Pease & A.H. Moore) Fernald
- Botrychium Boreale Milde ssp. boreale
- Botrychium Boreale Milde ssp. obtusilobum (Rupr.) R.T. Clausen
- Botrychium Boreale Milde var. obtusilobum (Rupr.) Broun
- Botrychium Californicum Underw.
- Botrychium Coulteri Underw.
- Botrychium Dissectum Spreng. var. obliquum (Muhl. ex Willd.) Clute
- Botrychium Dissectum Spreng. var. oblongifolium (Graves) Broun
- Botrychium Dissectum Spreng. var. oneidense (Gilbert) Farw.
- Botrychium Dissectum Spreng. var. tenuifolium (Underw.) Farw.
- Botrychium Dusenii auct. non (Christ) Alston
- Botrychium Lanceolatum (S.G. Gmel.) Angstr. ssp. angustisegmentum (Pease & A.H. Moore)
- Botrychium Lanceolatum (S.G. Gmel.) Angstr. ssp. typicum R.T. Clausen
- Botrychium Lunaria (L.) Sw. ssp. minganense (Vict.) Calder & Roy L. Taylor
- Botrychium Lunaria (L.) Sw. ssp. occidentale Á. Löve & D. Löve & Kapoor
- Botrychium Lunaria (L.) Sw. var. minganense (Vict.) Dole
- Botrychium Lunaria (L.) Sw. var. onondagense (Underw.) House
- Botrychium Matricariae (Schrank) Spreng.
- Botrychium Matricariifolium (A. Braun ex Dowell) A. Braun ex W.D.J. Koch ssp. hesperium Maxo
- Botrychium Matricariifolium (A. Braun ex Dowell) A. Braun ex W.D.J. Koch var. hesperium (Max
- Botrychium Multifidum (S.G. Gmel.) Trevis. ssp. californicum (Underw.) R.T. Clausen
- Botrychium Multifidum (S.G. Gmel.) Trevis. ssp. coulteri (Underw.) R.T. Clausen
- Botrychium Multifidum (S.G. Gmel.) Trevis. ssp. silaifolium (C. Presl) R.T. Clausen
- Botrychium Multifidum (S.G. Gmel.) Trevis. var. californicum (Underw.) Broun
- Botrychium Multifidum (S.G. Gmel.) Trevis. var. coulteri (Underw.) Broun
- Botrychium Multifidum (S.G. Gmel.) Trevis. var. intermedium (D.C. Eaton) Farw.
- Botrychium Multifidum (S.G. Gmel.) Trevis. var. oneidense (Gilbert) Farw.
- Botrychium Multifidum (S.G. Gmel.) Trevis. var. robustum (Rupr.) C. Chr.
- Botrychium Multifidum (S.G. Gmel.) Trevis. var. silaifolium (C. Presl) Broun
- Botrychium Obliquum Muhl. ex Willd.
- Botrychium Obliquum Muhl. ex Willd. var. elongatum Gilbert & Haberer
- Botrychium Onondagense Underw.
- Botrychium Silaifolium C. Presl
- Botrychium Silaifolium C. Presl var. coulteri (Underw.) Jeps.
- Botrychium Simplex E. Hitch. var. simplex
- Botrychium Simplex E. Hitchc. ssp. simplex
- Botrychium Simplex E. Hitchc. ssp. typicum R.T. Clausen
- Botrychium Simplex E. Hitchc. var. compositum (Lasch) Milde
- Botrychium Simplex E. Hitchc. var. laxifolium (R.T. Clausen) Fernald
- Botrychium Simplex E. Hitchc. var. tenebrosum (A.A. Eaton) R.T. Clausen
- Botrychium Subbifoliatum Brack.
- Botrychium Tenebrosum A.A. Eaton
- Botrychium Ternatum auct. non (Thunb.) Sw.
- Botrychium Virginianum (L.) Sw. ssp. europaeum (Angstr.) Jáv.
- Botrychium Virginianum (L.) Sw. var. europaeum Angstr.
- Botrydina Botryoides (L.) Redhead & Kuyper
- Botrydina Luteovitellina (Pilat & Nannf.) Redhead & Kuyper
- Botrydina Velutina (Quelet) Redhead & Kuyper
- Botrydina Viridis (Ach.) Redhead & Kuyper
- Botrydina Vulgaris Breb.
- Botrydium Botrys (L.) Small
- Botrypus Virginianus (L.) Michx.
- Botta's Clarkia - Clarkia Bottae (Spach) F.H. Lewis & M.E. Lewis
- Bottaria Cruentata Müll. Arg.
- Bottle Gentian - Gentiana Clausa Raf.
- Bottle Gourd - Lagenaria Siceraria (Molina) Standl.
- Bottle-palm - Beaucarnea Lem.
- Bottle-palm - Beaucarnea Recurvata Lem.
- Bottlebrush Buckeye - Aesculus Parviflora Walter
- Bottlebrush Bulrush - Isolepis Hystrix (Thunb.) Nees
- Bottlebrush - Callistemon R. Br.
- Bottlebrush - Callistemon Rigidus R. Br.
- Bottlebrush Sedge - Carex Hystericina Muhl. ex Willd.
- Bottlebrush Teatree - Melaleuca Squarrosa Donn ex Sm.
- Bottlebrush Threeawn - Aristida Spiciformis Elliott
- Bottomland Aster - Symphyotrichum Ontarionis (Wiegand) G.L. Nesom
- Bottomland Dewberry - Rubus Leviculus L.H. Bailey
- Bottomland Post Oak - Quercus Similis Ashe
- Botão-de-ouro - Jaegeria Hirta (Lag.) Less.
- Bouchea - Bouchea Cham.
- Bouchea Prismatica (L.) Kuntze var. brevirostra Grenz.
- Bouchea Prismatica (L.) Kuntze var. longirostra Grenz.
- Bouchetia Anamola auct. non (Miers) Loes.
- Bouchetia - Bouchetia Dunal
- Bougainvillea - Bougainvillea Comm. ex Juss.
- Bougainvillea - Bougainvillea ×buttiana Holttum & Standl.
- Boulder Mountain Cinquefoil - Potentilla Angelliae N.H. Holmgren
- Boulder Sedge - Carex Orestera Zika
- Bouncingbet - Saponaria Officinalis L.
- Boundary Peak Rockcress - Arabis Pinzliae Rollins
- Bountiful Hawthorn - Crataegus Alma Beadle
- Bouquet Aster - Eurybia Mirabilis (Torr. & A. Gray) G.L. Nesom
- Bouquet False Buttonweed - Spermacoce Densiflora (DC.) Alain
- Bouquet Mudplantain - Heteranthera Multiflora (Griseb.) Horn
- Bourbon Rose - Rosa ×borboniana N.H.F. Desp. (pro sp.)
- Bourgeau's Nutrush - Scleria Bourgeaui Boeckeler
- Bourgeau's Pepperweed - Lepidium Ramosissimum A. Nelson var. bourgeauanum (Thell.) Rollins
- Bourgov's Milkvetch - Astragalus Bourgovii A. Gray
- Bourreria Domingensis auct. non (DC.) Griseb.
- Bourreria Ovata Miers
- Bourreria Revoluta Kunth
- Bourreria Succulenta Jacq. var. revoluta (Kunth) O.E. Schulz
- Boussingaultia Baselloides Kunth
- Boussingaultia Gracilis Miers
- Boussingaultia Gracilis Miers var. pseudobaselloides (Hauman) L.H. Bailey
- Boussingaultia Leptostachys Moq.
- Bouteille's Fellhanera Lichen - Fellhanera Bouteillei (Desmaz.) Vezda
- Bouteloua Arenosa Vasey
- Bouteloua Barbata Lag. var. barbata
- Bouteloua Barbata Lag. var. rothrockii (Vasey) Gould
- Bouteloua Filiformis (Fourn.) Griffiths
- Bouteloua Glandulosa (Cerv.) Swallen
- Bouteloua Gracilis (Willd. ex Kunth) Lag. ex Griffiths var. stricta (Vasey) Hitchc.
- Bouteloua Heterostega (Trin.) Griffiths
- Bouteloua Hirsuta Lag. ssp. pectinata (Featherly) Wipff & S.D. Jones
- Bouteloua Hirsuta Lag. var. glandulosa (Cerv.) Gould
- Bouteloua Oligostachya (Nutt.) Torr. ex A. Gray
- Bouteloua Pectinata Featherly
- Bouvardia - Bouvardia Salisb.
- Bouvardia Glaberrima Engelm.
- Bower Wattle - Acacia Cognata Domin
- Bowl Lichen - Psoroma Hypnorum (Vahl) A. Gray
- Bowl Lichen - Psoroma Michx.
- Bowl Lichen - Psoroma Tenue Henssen
- Bowlesia - Bowlesia Ruiz & Pav.
- Bowlesia Septentrionalis J.M. Coult. & Rose
- Bowltube Iris - Iris Macrosiphon Torr.
- Bowman's Root - Gillenia Trifoliata (L.) Moench
- Bowstring Hemp - Sansevieria Senegambica Baker
- Box Bedstraw - Galium Buxifolium Greene
- Box Honeysuckle - Lonicera Nitida E.H. Wilson
- Box Huckleberry - Gaylussacia Brachycera (Michx.) A. Gray
- Box Knotweed - Polygonum Buxiforme Small
- Box Pussytoes - Antennaria Arcuata Cronquist
- Boxelder - Acer Negundo L.
- Boxelder - Acer Negundo L. var. interius (Britton) Sarg.
- Boxelder - Acer Negundo L. var. negundo
- Boxelder - Acer Negundo L. var. texanum Pax
- Boxelder - Acer Negundo L. var. violaceum (G. Kirchn.) H. Jaeger
- Boxfruit Alani - Melicope Peduncularis (Levl.) T.G. Hartley & B.C. Stone
- Boxleaf Stopper - Eugenia Foetida Pers.
- Boxleaf - Tetrapterys Buxifolia Cav.
- Boxthorn Fiddlewood - Citharexylum Brachyanthum (A. Gray) A. Gray
- Boxwood - Buxus L.
- Boyce Thompson Hedgehog Cactus - Echinocereus Boyce-thompsonii Orcutt
- Boyd's Maiden Fern - Thelypteris Boydiae (D.C. Eaton) K. Iwats.
- Boyden Cave Gilia - Gilia Yorkii Shevock & Day
- Boykin's Clusterpea - Dioclea Multiflora (Torr. & A. Gray) C. Mohr
- Boykin's Lobelia - Lobelia Boykinii Torr. & A. Gray ex A. DC.
- Boykin's Milkwort - Polygala Boykinii Nutt.
- Boykin's Milkwort - Polygala Boykinii Nutt. var. boykinii
- Boykin's Milkwort - Polygala Boykinii Nutt. var. sparsifolia Wheelock
- Boykinia Elata (Nutt.) Greene
- Boykinia Heucheriformis (Rydb.) Rosend.
- Boykinia Jamesii (Torr.) Engl.
- Boykinia Jamesii (Torr.) Engl. var. heucheriformis (Rydb.) Engl.
- Boykinia Major A. Gray var. intermedia Piper
- Boykinia Ranunculifolia (Hook.) A. Gray
- Boykinia Turbinata (Rydb.) Fedde
- Boykinia Vancouverensis (Rydb.) Fedde
- Boynton Sand Post Oak - Quercus Boyntonii Beadle
- Boynton's Dewberry - Rubus Boyntonii Ashe
- Brace's Aster - Symphyotrichum Bracei (Britton ex Small) G.L. Nesom
- Braceletwood - Jacquinia Armillaris Jacq.
- Brachelyma Moss - Brachelyma Schimp. ex Cardot
- Brachelyma Moss - Brachelyma Subulatum (P. Beauv.) Schimp. ex Cardot
- Brachelyma Robustum (Cardot) E. Britton
- Brachiaria Adspersa (Trin.) Parodi
- Brachiaria Arizonica (Scribn. & Merr.) S.T. Blake
- Brachiaria Arrecta (Hack. ex T. Dur. & Schinz) Stent
- Brachiaria Brizantha (Hochst. ex A. Rich.) Stapf
- Brachiaria Ciliatissima (Buckley) Chase
- Brachiaria Decumbens Stapf
- Brachiaria Deflexa (Schumach.) C.E. Hubbard ex Robyns
- Brachiaria Dictyoneura (Fig. & De Not.) Stapf
- Brachiaria Distichophylla (Trin.) Stapf
- Brachiaria Echinulata (Mez) Parodi
- Brachiaria Extensa Chase
- Brachiaria Fasciculata (Sw.) Parodi
- Brachiaria Fasciculata (Sw.) Parodi var. reticulata (Torr.) Beetle
- Brachiaria Humidicola (Rendle) Schweick.
- Brachiaria Mollis (Sw.) Parodi [excluded]
- Brachiaria Mutica (Forssk.) Stapf
- Brachiaria Oligobrachiata (Pilg.) Henr.
- Brachiaria Paspaloides (J. Presl) C.E. Hubb.
- Brachiaria Piligera (F. Muell. ex Benth.) Hughes
- Brachiaria Plantaginea (Link) Hitchc.
- Brachiaria Platyphylla (Munro ex C. Wright) Nash
- Brachiaria Platytaenia Stapf
- Brachiaria Purpurascens (Raddi) Henr.
- Brachiaria Ramosa (L.) Stapf
- Brachiaria Reptans (L.) Gard. & C.E. Hubbard
- Brachiaria Ruziziensis Germ. & Evrard
- Brachiaria Serrata (Thunb.) Stapf
- Brachiaria Subquadripara (Trin.) Hitchc.
- Brachiaria Subquadripara (Trin.) Hitchc. var. piligera (F. Muell. ex Benth.) Reeder
- Brachiaria Texana (Buckley) S.T. Blake
- Brachiaria Xantholeuca (Schinz) Stapf
- Brachionidium Distichophylla (Trin.) Stapf. [excluded]
- Brachionidium Parvum Cogn. [excluded]
- Brachyachne Convergens (F. Muell.) Stapf
- Brachyachne Stapf
- Brachyactis Angusta (Lindl.) Britton
- Brachyactis Ciliata (Ledeb.) Ledeb.
- Brachyactis Ciliata (Ledeb.) Ledeb. ssp. angusta (Lindl.) A.G. Jones
- Brachyactis Frondosa (Nutt.) A. Gray
- Brachychaeta Sphacelata (Raf.) Britton
- Brachychiton - Brachychiton Schott & Endl.
- Brachydontium Moss - Brachydontium Fürnr.
- Brachydontium Moss - Brachydontium Trichodes (F. Weber) Milde
- Brachyelytrum Aristosum (Michx.) Trel. var. glabratum Vasey ex Millsp.
- Brachyelytrum Erectum (Schreb. ex Spreng.) P. Beauv. var. glabratum (Vasey ex Millsp.)
- Brachyelytrum Erectum (Schreb. ex Spreng.) P. Beauv. var. septentrionale Babel
- Brachyelytrum Septentrionale (Babel) G. Tucker
- Brachymenium Macrocarpum Cardot
- Brachymenium Mexicanum Mont.
- Brachymenium Moss - Brachymenium Schwägr.
- Brachymenium Moss - Brachymenium Speciosum (Hook. f. & Wilson) Steere
- Brachymenium Moss - Brachymenium Systylium (Müll. Hal.) A. Jaeger
- Brachyodon Trichodes (F. Weber) Fürnr.
- Brachypodium Caespitosum (Host) Roem. & Schult., orth. var.
- Brachypodium Cespitosum (Host) Roem. & Schult.
- Brachypodium Mucronatum Willk.
- Brachypodium Pinnatum (L.) P. Beauv. ssp. cespitosum (Host) Hack.
- Brachypodium Ramosum (L.) Roem. & Schult.
- Brachypodium Retusum (Pers.) P. Beauv.
- Brachypodium Rupestre (Host) Roem. & Schult. ssp. cespitosum (Host) H. Scholz
- Brachypodum Caespitosum (Host) Roem. & Schult., database artifact
- Brachypterys Ovata (Cav.) Small
- Brachyris Dracunculoides DC.
- Brachyris Microcephala DC.
- Brachythecium Acuminatum (Hedw.) Austin var. rupincola (Hedw.) Rau & Herv.
- Brachythecium Acuminatum (Hedw.) Austin var. setosum (Hedw.) Rau & Herv.
- Brachythecium Albicans (Hedw.) Schimp. var. occidentale Renauld & Cardot
- Brachythecium Asperrimum (Mitt.) Sull.
- Brachythecium Beringianum Cardot & Thér.
- Brachythecium Bestii Grout
- Brachythecium Brandegeei (Austin) H. Rob.
- Brachythecium Cavernosum Kindb.
- Brachythecium Cirrosum (Schwägr.) Schimp.
- Brachythecium Cirrosum (Schwägr.) Schimp. var. coloradense (Austin) Wijk & Margad.
- Brachythecium Collinum (Schleich. ex Müll. Hal.) Schimp. var. idahense (Renauld & Cardo
- Brachythecium Curtum (Lindb.) Limpr.
- Brachythecium Cyrtophyllum Kindb.
- Brachythecium Edentatum R.S. Williams
- Brachythecium Erythrorrhizon Schimp. var. suberythrorrhizon (Renauld & Cardot) Grout
- Brachythecium Fendleri (Sull.) A. Jaeger var. idahense (Renauld & Cardot) Wijk & Margad
- Brachythecium Flagellare (Hedw.) Jenn.
- Brachythecium Flagellare (Hedw.) Jenn. var. homomallum (Schimp.) Jenn.
- Brachythecium Flagellare (Hedw.) Jenn. var. pringlei (R.S. Williams) Grout
- Brachythecium Flagellare (Hedw.) Jenn. var. roellii (Renauld & Cardot) Grout
- Brachythecium Flexicaule Renauld & Cardot
- Brachythecium Gemmascens Müll. Hal. & Kindb.
- Brachythecium Hyalotapetum B.L. Higinb. & N.L. Higinb., database artifact
- Brachythecium Idahense Renauld & Cardot
- Brachythecium Labradoricum (Kindb.) Par.
- Brachythecium Lamprochryseum Müll. Hal. & Kindb.
- Brachythecium Lamprochryseum Müll. Hal. & Kindb. var. giganteum Grout
- Brachythecium Lamprochryseum Müll. Hal. & Kindb. var. solfatarense Grout
- Brachythecium Latifolium Kindb.
- Brachythecium Moss - Brachythecium Albicans (Hedw.) Schimp.
- Brachythecium Moss - Brachythecium Biventrosum (Müll. Hal.) A. Jaeger
- Brachythecium Moss - Brachythecium Campestre (Müll. Hal.) Schimp.
- Brachythecium Moss - Brachythecium Collinum (Schleich. ex Müll. Hal.) Schimp.
- Brachythecium Moss - Brachythecium Digastrum Müll. Hal. & Kindb.
- Brachythecium Moss - Brachythecium Erythrorrhizon Schimp.
- Brachythecium Moss - Brachythecium Hylotapetum B.L. Higinb. & N.L. Higinb.
- Brachythecium Moss - Brachythecium Mildeanum (Schimp.) Schimp. ex Milde
- Brachythecium Moss - Brachythecium Oedipodium (Mitt.) A. Jaeger
- Brachythecium Moss - Brachythecium Oxycladon (Brid.) A. Jaeger
- Brachythecium Moss - Brachythecium Plumosum (Hedw.) Schimp.
- Brachythecium Moss - Brachythecium Populeum (Hedw.) Schimp.
- Brachythecium Moss - Brachythecium Reflexum (Starke) Schimp.
- Brachythecium Moss - Brachythecium Reflexum (Starke) Schimp. var. reflexum
- Brachythecium Moss - Brachythecium Rivulare Schimp.
- Brachythecium Moss - Brachythecium Rotaeanum De Not.
- Brachythecium Moss - Brachythecium Rutabulum (Hedw.) Schimp.
- Brachythecium Moss - Brachythecium Salebrosum (F. Weber & D. Mohr) Schimp.
- Brachythecium Moss - Brachythecium Salebrosum (F. Weber & D. Mohr) Schimp. var. salebrosum
- Brachythecium Moss - Brachythecium Schimp.
- Brachythecium Moss - Brachythecium Stereopoma (Spruce ex Mitt.) A. Jaeger
- Brachythecium Moss - Brachythecium Trachypodium (Brid.) Schimp.
- Brachythecium Moss - Brachythecium Velutinum (Hedw.) Schimp.
- Brachythecium Moss - Brachythecium Velutinum (Hedw.) Schimp. var. velutinum
- Brachythecium Moss - Brachythecium Velutinum (Hedw.) Schimp. var. venustum (De Not.) Arc.
- Brachythecium Novae-angliae (Sull. & Lesq.) A. Jaeger
- Brachythecium Oxycladon (Brid.) A. Jaeger var. dentatum (Lesq. & James) Grout
- Brachythecium Pennellii E.B. Bartram
- Brachythecium Petrophilum R.S. Williams
- Brachythecium Piliferum (Hedw.) Kindb.
- Brachythecium Plumosum (Hedw.) Schimp. var. homomallum Schimp.
- Brachythecium Plumosum (Hedw.) Schimp. var. pringlei (R.S. Williams) Grout
- Brachythecium Plumosum (Hedw.) Schimp. var. roellii (Renauld & Cardot) Grout
- Brachythecium Populeum (Hedw.) Schimp. var. majus Schimp.
- Brachythecium Populeum (Hedw.) Schimp. var. ovatum Grout
- Brachythecium Populeum (Hedw.) Schimp. var. rufescens Schimp.
- Brachythecium Pseudocollinum Kindb.
- Brachythecium Pseudostarkei Renauld & Cardot
- Brachythecium Rivulare Schimp. var. cataractarum Saut.
- Brachythecium Rivulare Schimp. var. lamoillense Grout
- Brachythecium Rivulare Schimp. var. laxum Grout
- Brachythecium Rivulare Schimp. var. noveboracense (Grout) H. Rob.
- Brachythecium Rutabulum (Hedw.) Schimp. var. flavescens Schimp.
- Brachythecium Rutabulum (Hedw.) Schimp. var. turgescens Limpr.
- Brachythecium Salebrosum (F. Weber & D. Mohr) Schimp. var. densum Schimp.
- Brachythecium Serrulatum (Hedw.) H. Rob.
- Brachythecium Splendens Austin
- Brachythecium Starkei (Brid.) Schimp. ssp. oedipodium (Mitt.) Renauld & Cardot
- Brachythecium Starkei (Brid.) Schimp. var. curtum (Lindb.) Warnst.
- Brachythecium Starkei (Brid.) Schimp. var. explanatum (Brid.) Mönk.
- Brachythecium Starkei (Brid.) Schimp. var. pacificum (Renauld & Cardot) E. Lawton
- Brachythecium Subasperrimum Cardot & Thér.
- Brachythecium Suberythrorrhizon Renauld & Cardot
- Brachythecium Tromsoense auct. Amer.
- Brachythecium Utahense James
- Brachythecium Washingtonianum D.C. Eaton
- Brachythecium Wootonii Grout
- Brackenfern - Pteridium Gleditsch ex Scop.
- Brackenridge's Rosemallow - Hibiscus Brackenridgei A. Gray
- Brackenridge's Rosemallow - Hibiscus Brackenridgei A. Gray ssp. brackenridgei
- Brackenridge's Rosemallow - Hibiscus Brackenridgei A. Gray ssp. molokaianus (Rock ex Caum) F.D. Wilson
- Bracketplant - Chlorophytum Capense (L.) Voss
- Bract Gumweed - Grindelia Camporum Greene var. bracteosa (J.T. Howell) M.A. Lane
- Bract Milkweed - Asclepias Brachystephana Engelm. ex Torr.
- Bract Saxifrage - Saxifraga Sibirica L.
- Bracted Alumroot - Heuchera Bracteata (Torr.) Ser.
- Bracted Arrowwood - Viburnum Bracteatum Rehder
- Bracted Bedstraw - Galium Microphyllum A. Gray
- Bracted Blazing Star - Liatris Bracteata Gaiser
- Bracted Colicroot - Aletris Bracteata Northrop
- Bracted Fanpetals - Sida Ciliaris L.
- Bracted Heliotrope - Heliotropium Bracteatum R. Br.
- Bracted Jewelflower - Streptanthus Bracteatus A. Gray
- Bracted Lousewort - Pedicularis Bracteosa Benth.
- Bracted Lousewort - Pedicularis Bracteosa Benth. var. atrosanguinea (Pennell & J.W. Thomp.) Cronquist
- Bracted Lousewort - Pedicularis Bracteosa Benth. var. bracteosa
- Bracted Nutrush - Scleria Bracteata Cav. [excluded]
- Bracted Passionflower - Passiflora Affinis Engelm.
- Bracted Phyllostegia - Phyllostegia Bracteata Sherff
- Bracted Popcornflower - Plagiobothrys Bracteatus (Howell) I.M. Johnst.
- Bracted Popcornflower - Plagiobothrys Bracteatus (Howell) I.M. Johnst. var. aculeolatus (Piper) I.M. Johnst.
- Bracted Popcornflower - Plagiobothrys Bracteatus (Howell) I.M. Johnst. var. bracteatus
- Bracted Strawflower - Bracteantha Bracteata (Vent.) Anderb. & Heagi
- Bracted Sulphur Lichen - Fulgensia Bracteata (Hoffm.) Rasanen
- Bracteolate Alyxia - Alyxia Bracteolosa W. Rich ex A. Gray
- Bractless Blazingstar - Mentzelia Nuda (Pursh) Torr. & A. Gray
- Bractless Blazingstar - Mentzelia Nuda (Pursh) Torr. & A. Gray var. nuda
- Bractless Blazingstar - Mentzelia Nuda (Pursh) Torr. & A. Gray var. stricta (Osterh.) Harrington
- Bractless Hedgehyssop - Gratiola Ebracteata Benth. ex A. DC.
- Bractscale - Atriplex Serenana A. Nelson
- Bractscale - Atriplex Serenana A. Nelson var. serenana
- Bractspike - Yeatesia Small
- Bracyrhamphus Intybaceus (Jacq.) DC.
- Bradburia Hirtella Torr. & A. Gray
- Bradburia Pilosa (Nutt.) Semple
- Bradburya Arenicola Small
- Bradburya Floridana Britton
- Bradburya Plumieri (Turp. ex Pers.) Kuntze
- Bradburya Pubescens (Benth.) Kuntze
- Bradburya Virginiana (L.) Kuntze
- Bradley's Spleenwort - Asplenium Bradleyi D.C. Eaton
- Bradshaw's Desertparsley - Lomatium Bradshawii (Rose ex Mathias) Mathias & Constance
- Brady's Pincushion Cactus - Pediocactus Bradyi L.D. Benson
- Brahea Filamentosa (Fenzi) H. Wendl.
- Brahea Filifera W. Watson, nom. inval.
- Brahea Serrulata (Michx.) H. Wendl.
- Brainerd's Hawthorn - Crataegus Brainerdii Sarg.
- Brainerd's Sedge - Carex Brainerdii Mack.
- Brake Fern - Pteris L.
- Brake Fern - Pteris Tapeinidiifolia H. Ito
- Brake Fern - Pteris ×delchampsii W.H. Wagner & C.E. Nauman
- Brake Fern - Pteris ×hillebrandii Copeland
- Bramble Acacia - Acacia Victoriae Benth.
- Bramblefern - Hypolepis Repens (L.) C. Presl
- Bramia Monnieri (L.) Drake
- Bramia Rotundifolia (Michx.) Britton
- Bran Lichen - Parmeliopsis (stizenb.) Nyl.
- Bran Lichen - Parmeliopsis Hyperopta (Ach.) Arnold
- Bran Lichen - Parmeliopsis Subambigua Gyel.
- Branched Blackberry - Rubus Suus L.H. Bailey
- Branched Blazing Star - Liatris Cymosa (H. Ness) K. Schum.
- Branched Bur-reed - Sparganium Androcladum (Engelm.) Morong
- Branched Centaury - Centaurium Pulchellum (Sw.) Druce
- Branched Cinquefoil - Potentilla Effusa Douglas ex Lehm.
- Branched Draba - Draba Ramosissima Desv.
- Branched False Goldenweed - Oonopsis Multicaulis (Nutt.) Greene
- Branched Fenugreek - Trigonella Ramosa L., nom. inq.
- Branched Foldwing - Dicliptera Brachiata (Pursh) Spreng.
- Branched Hedgehyssop - Gratiola Ramosa Walter
- Branched Indian Clover - Trifolium Dichotomum Hook. & Arn.
- Branched Lagophylla - Lagophylla Ramosissima Nutt.
- Branched Lagophylla - Lagophylla Ramosissima Nutt. ssp. congesta (Greene) D.D. Keck
- Branched Lagophylla - Lagophylla Ramosissima Nutt. ssp. ramosissima
- Branched Noseburn - Tragia Ramosa Torr.
- Branched Pencil Cholla - Cylindropuntia Ramosissima (Engelm.) F.M. Knuth
- Branched Porterweed - Stachytarpheta Australis Moldenke
- Branched Scouringrush - Equisetum Ramosissimum Desf.
- Branched Starviolet - Hedyotis Divaricata (Valeton) Hosok.
- Branched Starviolet - Hedyotis Divaricata (Valeton) Hosok. var. divaricata
- Branched Tearthumb - Polygonum Meisnerianum Cham. & Schltdl.
- Branched Tearthumb - Polygonum Meisnerianum Cham. & Schltdl. var. beyrichianum (Cham. & Schltdl.) Meisn.
- Branching Phacelia - Phacelia Ramosissima Douglas ex Lehm.
- Branching Phacelia - Phacelia Ramosissima Douglas ex Lehm. var. austrolitoralis Munz
- Branching Phacelia - Phacelia Ramosissima Douglas ex Lehm. var. eremophila (Greene) J.F. Macbr.
- Branching Phacelia - Phacelia Ramosissima Douglas ex Lehm. var. latifolia (Torr.) Cronquist
- Branching Phacelia - Phacelia Ramosissima Douglas ex Lehm. var. montereyensis Munz
- Branching Phacelia - Phacelia Ramosissima Douglas ex Lehm. var. ramosissima
- Branching Phacelia - Phacelia Ramosissima Douglas ex Lehm. var. subglabra M. Peck
- Brand's Phacelia - Phacelia Gilioides Brand
- Brandegee's Buckwheat - Eriogonum Brandegeei Rydb.
- Brandegee's Buttercup - Ranunculus Macauleyi A. Gray var. brandegeei L.D. Benson
- Brandegee's Cirriphyllum Moss - Cirriphyllum Brandegeei (Austin) Grout
- Brandegee's Clarkia - Clarkia Biloba (Durand) A. Nelson & J.F. Macbr. ssp. brandegeeae (Jeps.) F.H. L
- Brandegee's Clover - Trifolium Brandegeei S. Watson
- Brandegee's Desertparsley - Lomatium Brandegeei (J.M. Coult. & Rose) J.F. Macbr.
- Brandegee's Four-nerve Daisy - Tetraneuris Brandegeei (Porter ex A. Gray) K.F. Parker
- Brandegee's Fumewort - Corydalis Caseana A. Gray ssp. brandegeei (S. Watson) G.B. Ownbey
- Brandegee's Jacob's-ladder - Polemonium Brandegeei (A. Gray) Greene
- Brandegee's Milkvetch - Astragalus Brandegeei Porter
- Brandegee's Onion - Allium Brandegeei S. Watson
- Brandegee's Penstemon - Penstemon Glaber Pursh var. brandegeei (Porter) Freeman
- Brandegee's Springbeauty - Claytonia Saxosa Brandegee
- Brandegee's Tansyaster - Machaeranthera Coloradoensis (A. Gray) Osterh. var. brandegeei (Rydb.) T.J. Watson ex R.L. Ha
- Brandegee's Woollystar - Eriastrum Brandegeeae H. Mason
- Brant's Oak - Quercus Brantii Lindl.
- Brasenia - Brasenia Schreb.
- Brasenia Peltata Pursh
- Brasiletto - Caesalpinia Violacea Standl.
- Brassaia Actinophylla Endl.
- Brassavola - Brassavola R. Br.
- Brassia - Brassia R. Br.
- Brassia Gireoudiana Rchb. f. & Warsz.
- Brassia Maculata R. Br.
- Brassica Alba Rabenh., non L.
- Brassica Arvensis (L.) Rabenh., non L., nom. illeg.
- Brassica Arvensis L.
- Brassica Campestris L.
- Brassica Campestris L. ssp. napus Duthie & Fuller
- Brassica Campestris L. ssp. rapifera (Metzger) Sinsk.
- Brassica Campestris L. var. dichotoma (Roxb.) G. Watt
- Brassica Campestris L. var. oleifera DC.
- Brassica Campestris L. var. rapa (L.) Hartm.
- Brassica Campestris L. var. sarson Prain
- Brassica Carinata A. Braun [excluded]
- Brassica Caulorapa (DC.) Pasq.
- Brassica Elongata Ehrh. ssp. integrifolia (Boiss.) Breistr.
- Brassica Eruca L.
- Brassica Erucastrum L.
- Brassica Geniculata (Desf.) J. Ball
- Brassica Hirta Moench
- Brassica Incana Ten.
- Brassica Integrifolia (Vahl) O.E.Schulz, non Rupr.
- Brassica Integrifolia Rupr.
- Brassica Japonica Thunb.
- Brassica Juncea (L.) Czern. var. crispifolia L.H. Bailey
- Brassica Juncea (L.) Czern. var. japonica (Thunb.) L.H. Bailey
- Brassica Kaber (DC.) L.C. Wheeler
- Brassica Kaber (DC.) L.C. Wheeler var. orientalis (L.) Scoggan
- Brassica Kaber (DC.) L.C. Wheeler var. pinnatifida (Stokes) L.C. Wheeler
- Brassica Kaber (DC.) L.C. Wheeler var. schkuhriana (Rchb.) L.C. Wheeler
- Brassica Napobrassica (L.) Mill.
- Brassica Napus L. var. annua W.D.J. Koch
- Brassica Napus L. var. napobrassica (L.) Rchb.
- Brassica Napus L. var. oleifera Delile
- Brassica Oleracea L. var. acephala DC.
- Brassica Oleracea L. var. alboglabra (L.H. Bailey) Musil
- Brassica Oleracea L. var. capitata L.
- Brassica Oleracea L. var. caulorapa DC.
- Brassica Oleracea L. var. chinensis (L.) Prain
- Brassica Oleracea L. var. tronchuda L.H. Bailey
- Brassica Orientalis L.
- Brassica Pe-tsai L.H. Bailey
- Brassica Pekinensis (Lour.) Rupr.
- Brassica Rapa L. ssp. campestris (L.) Clapham
- Brassica Rapa L. ssp. olifera DC.
- Brassica Rapa L. ssp. rapa
- Brassica Rapa L. ssp. rapifera Metzger
- Brassica Rapa L. ssp. sarson (Prain) Denford
- Brassica Rapa L. ssp. sylvestris Janchen
- Brassica Rapa L. var. campestris (L.) W.D.J. Koch
- Brassica Rapa L. var. oleifera DC.
- Brassica Rapa L. var. perviridis L.H. Bailey
- Brassica Rapa L. var. septiceps L.H. Bailey
- Brassica Sisymbrioides (Fisch.) Grossh. [excluded]
- Brassica Tournefortii Gouan var. sisymbrioides (Fisch.) Grossh.
- Brassica Trilocularis (Roxb.) Hook. f. & Thomson
- Brassica Willdenowii Boiss.
- Bratt's Orange Lichen - Caloplaca Brattiae W.A. Weber
- Braun's Erigeron - Erigeron Pulchellus Michx. var. brauniae Fernald
- Braun's Hollyfern - Polystichum Braunii (Spenner) Fée
- Braun's Rockcress - Arabis Perstellata E.L. Braun
- Braun's Spikemoss - Selaginella Braunii Baker
- Brauneria Angustifolia (DC.) A. Heller
- Brauneria Pallida (Nutt.) Britton
- Brauneria Purpurea (L.) Britton
- Braunia Californica Lesq.
- Braunia Moss - Braunia Schimp.
- Braunia Moss - Braunia Secunda (Hook.) Schimp.
- Braunton's Milkvetch - Astragalus Brauntonii Parish
- Bravo Acacia - Vachellia Bravoensis (Isely) Seigler & Ebinger
- Braxilia Minor (L.) House
- Braya Alpina Sternb. & Hoppe var. americana (Hook.) S. Watson
- Braya Alpina Sternb. & Hoppe var. glabella (Richardson) S. Watson
- Braya Americana (Hook.) Fernald
- Braya Arctica Hook.
- Braya Bartlettiana Jordal
- Braya Henryae Raup
- Braya Humilis (C.A. Mey.) B.L. Rob.
- Braya Humilis (C.A. Mey.) B.L. Rob. ssp. abbei Böcher
- Braya Humilis (C.A. Mey.) B.L. Rob. ssp. arctica (Böcher) Rollins
- Braya Humilis (C.A. Mey.) B.L. Rob. ssp. ellesmerensis J.G. Harris
- Braya Humilis (C.A. Mey.) B.L. Rob. ssp. maccallae J.G. Harris
- Braya Humilis (C.A. Mey.) B.L. Rob. ssp. porsildii J.G. Harris
- Braya Humilis (C.A. Mey.) B.L. Rob. ssp. richardsonii (Rydb.) Hultén
- Braya Humilis (C.A. Mey.) B.L. Rob. ssp. ventosa Rollins
- Braya Humilis (C.A. Mey.) B.L. Rob. var. abbei (Böcher) B. Boivin
- Braya Humilis (C.A. Mey.) B.L. Rob. var. americana (Hook.) B. Boivin
- Braya Humilis (C.A. Mey.) B.L. Rob. var. arctica (Böcher) B. Boivin
- Braya Humilis (C.A. Mey.) B.L. Rob. var. glabella (Richardson) B. Boivin
- Braya Humilis (C.A. Mey.) B.L. Rob. var. interior (Böcher) B. Boivin
- Braya Humilis (C.A. Mey.) B.L. Rob. var. laurentiana (Böcher) B. Boivin
- Braya Humilis (C.A. Mey.) B.L. Rob. var. leiocarpa (Trautv.) Fernald
- Braya Humilis (C.A. Mey.) B.L. Rob. var. novae-angliae (Rydb.) Fernald
- Braya Humilis (C.A. Mey.) B.L. Rob. var. ventosa (Rollins) B. Boivin
- Braya Intermedia T.J. Sørensen
- Braya Novae-angliae (Rydb.) T.J. Sørensen
- Braya Novae-angliae (Rydb.) T.J. Sørensen var. interior Böcher
- Braya Novae-angliae (Rydb.) T.J. Sørensen var. laurentiana Böcher
- Braya Pilosa Hook. ssp. thorild-wulffii (Ostenf.) V.V. Petrovsky
- Braya Purpurascens (R. Br.) Bunge
- Braya Purpurascens (R. Br.) Bunge ssp. pilosa (Hook.) Hultén
- Braya Purpurascens (R. Br.) Bunge ssp. thorild-wulffii (Ostenf.) Hultén
- Braya Purpurascens (R. Br.) Bunge var. fernaldii (Abbe) B. Boivin
- Braya Purpurascens (R. Br.) Bunge var. longii (Fernald) B. Boivin
- Braya Purpurascens (R. Br.) Bunge var. thorild-wulffii (Ostenf.) B. Boivin
- Braya Richardsonii (Rydb.) Fernald
- Brayulinea Densa (Humb. & Bonpl. ex Schult.) Small
- Brazilian Bayhops - Ipomoea Pes-caprae (L.) R. Br. ssp. brasiliensis (L.) van Ooststr.
- Brazilian Begonia - Begonia Hirtella Link
- Brazilian Bluewood - Condalia Hookeri M.C. Johnst.
- Brazilian Bluewood - Condalia Hookeri M.C. Johnst. var. hookeri
- Brazilian Bristlegrass - Setaria Rariflora Mikan ex Trin.
- Brazilian Cat's Ear - Hypochaeris Brasiliensis (Less.) Benth. & Hook. ex Griseb.
- Brazilian Copperlily - Habranthus Robustus Herb. ex Sweet
- Brazilian Croton - Croton Glandulosus L. var. scordioides (Lam.) Müll. Arg.
- Brazilian Dwarf Morning-glory - Evolvulus Glomeratus Nees & Mart.
- Brazilian Dwarf Morning-glory - Evolvulus Glomeratus Nees & Mart. ssp. grandiflorus (Parodi) van Ooststr.
- Brazilian Firetree - Schizolobium Parahybum (Vell.) S.F. Blake
- Brazilian Firetree - Schizolobium Vogel
- Brazilian Glorytree - Tibouchina Granulosa (Desr.) Cogn.
- Brazilian Gloxinia - Sinningia Speciosa (G. Lodd.) Hiern
- Brazilian Jackbean - Canavalia Brasiliensis Mart. ex Benth.
- Brazilian Joyweed - Alternanthera Brasiliana (L.) Kuntze
- Brazilian Morning-glory - Ipomoea Setosa Ker Gawl.
- Brazilian Nightshade - Solanum Seaforthianum Andrews
- Brazilian Peperomia - Peperomia Urocarpa Fisch. & C.A. Mey.
- Brazilian Peppertree - Schinus Terebinthifolius Raddi
- Brazilian Peppertree - Schinus Terebinthifolius Raddi var. raddianus Engl.
- Brazilian Pricklypear - Brasiliopuntia (k. Schum.) A. Berger
- Brazilian Pricklypear - Brasiliopuntia Brasiliensis (Willd.) A. Berger
- Brazilian Red-cloak - Megaskepasma Erythrochlamys Lindau
- Brazilian Red-cloak - Megaskepasma Lindau
- Brazilian Rosemallow - Hibiscus Phoeniceus Jacq.
- Brazilian Satintail - Imperata Brasiliensis Trin.
- Brazilian Vervain - Verbena Brasiliensis Vell.
- Brazilian Water Hyacinth - Eichhornia Paniculata (Spreng.) Solms
- Brazilian Watergrass - Luziola Bahiensis (Steud.) Hitchc.
- Brazilian Waterhyssop - Bacopa Egensis (Poepp.) Pennell
- Brazilian Watermeal - Wolffia Brasiliensis Weddell
- Brazilian Waterweed - Egeria Densa Planch.
- Brazilian Wild Petunia - Ruellia Devosiana hort. Makoy ex A.E. Murray
- Brazilian-plume - Justicia Carnea Lindl.
- Brazilnut - Bertholletia Excelsa Humb. & Bonpl.
- Brazilwood - Caesalpinia Echinata Lam.
- Brazoria Palmetto - Sabal ×brazoriensis D.H. Goldman, Lockett, & Read
- Brazoria Pulcherrima Lundell
- Brazoria Scutellarioides Engelm. & A. Gray
- Brazos Hawthorn - Crataegus Brazoria Sarg.
- Brazos Milkvetch - Astragalus Brazoensis Buckley
- Brazos River Yucca - Yucca Necopina Shinners
- Brazos Rockcress - Arabis Petiolaris (A. Gray) A. Gray
- Brazos-mint - Brazoria Engelm. & A. Gray
- Brazosmint - Warnockia M.w. Turner
- Bread And Cheese - Paullinia L.
- Bread And Cheese - Paullinia Pinnata L.
- Breadfruit - Artocarpus Altilis (Parkinson) Fosberg
- Breadfruit - Artocarpus J.r. Forst. & G. Forst.
- Breadnut - Brosimum Alicastrum Sw.
- Breakbill - Sideroxylon Obovatum Lam.
- Breea Arvensis (L.) Less.
- Breea Incana (S.G. Gmel.) W.A. Weber, ined.
- Breidleria Arcuata (Molendo) Loeske
- Breidleria Pratensis (Rabenh.) Loeske
- Breitungia Oregana (Nutt.) Á. Löve & D. Löve
- Brenda's Yellow Cryptantha - Cryptantha Flava (A. Nelson) Payson
- Bretonica Peluda - Melochia Spicata (L.) Fryxell
- Bretonica Prieta - Melochia Nodiflora Sw.
- Breutel's Notothylas - Notothylas Breutelii (Gottsche) Gottsche
- Brevoortia Ida-maia Alph. Wood
- Brevoortia Venusta Greene
- Brewer Spruce - Picea Breweriana S. Watson
- Brewer's Angelica - Angelica Breweri A. Gray
- Brewer's Aster - Eucephalus Breweri (A. Gray) G.L. Nesom
- Brewer's Bittercress - Cardamine Breweri S. Watson
- Brewer's Bittercress - Cardamine Breweri S. Watson var. breweri
- Brewer's Bittercress - Cardamine Breweri S. Watson var. orbicularis (Greene) Detling
- Brewer's Cliffbrake - Pellaea Breweri D.C. Eaton
- Brewer's Dwarf-flax - Hesperolinon Breweri (A. Gray) Small
- Brewer's Erigeron - Erigeron Breweri A. Gray var. bisanctus G.L. Nesom
- Brewer's Fleabane - Erigeron Breweri A. Gray
- Brewer's Fleabane - Erigeron Breweri A. Gray var. breweri
- Brewer's Fleabane - Erigeron Breweri A. Gray var. jacinteus (H.M. Hall) Cronquist
- Brewer's Fleabane - Erigeron Breweri A. Gray var. porphyreticus (M.E. Jones) Cronquist
- Brewer's Jewelflower - Streptanthus Breweri A. Gray
- Brewer's Lupine - Lupinus Breweri A. Gray
- Brewer's Lupine - Lupinus Breweri A. Gray var. breweri
- Brewer's Milkvetch - Astragalus Breweri A. Gray
- Brewer's Miterwort - Mitella Breweri A. Gray
- Brewer's Monardella - Monardella Breweri A. Gray
- Brewer's Monkeyflower - Mimulus Breweri (Greene) Coville
- Brewer's Navarretia - Navarretia Breweri (A. Gray) Greene
- Brewer's Phacelia - Phacelia Breweri A. Gray
- Brewer's Ragwort - Packera Breweri (Burtt Davy) W.A. Weber & Á. Löve
- Brewer's Redmaids - Calandrinia Breweri S. Watson
- Brewer's Rockcress - Arabis Breweri S. Watson
- Brewer's Rockcress - Arabis Breweri S. Watson var. austiniae (Greene) Rollins
- Brewer's Rockcress - Arabis Breweri S. Watson var. breweri
- Brewer's Rockcress - Arabis Breweri S. Watson var. pecuniaria Rollins
- Brewer's Rush - Juncus Breweri Engelm.
- Brewer's Sedge - Carex Breweri Boott
- Brewer's Snapdragon - Sairocarpus Breweri (A. Gray) D.A. Sutton
- Brewer's Willow - Salix Breweri Bebb
- Breweria Aquatica (Walter) A. Gray
- Breweria Humistrata (Walter) A. Gray
- Breweria Michauxii Fernald & B.G. Schub.
- Breweria Ovalifolia (Torr.) A. Gray
- Breweria Pickeringii (Torr. ex M.A. Curtis) A. Gray
- Breweria Pickeringii (Torr. ex M.A. Curtis) A. Gray var. caesariensis Fernald & B.G.
- Breweria Pickeringii (Torr. ex M.A. Curtis) A. Gray var. pattersonii Fernald & B.G. S
- Breweria Villosa Nash
- Brewster County Barometerbush - Leucophyllum Candidum I.M. Johnst.
- Breynia - Breynia J.r. Forst. & G. Forst.
- Breynia Nivosa (W. Bull) Small
- Briar Root - Erica Arborea L.
- Brickellbush - Asanthus R.m. King & H. Rob.
- Brickellbush Aster - Eucephalus Brickellioides (Greene) G.L. Nesom
- Brickellbush - Brickellia Elliott
- Brickellbush - Brickelliastrum R.m. King & H. Rob.
- Brickellbush - Flyriella R.m. King & H. Rob.
- Brickellbush Goldenweed - Hazardia Brickellioides (S.F. Blake) W.D. Clark
- Brickellia Atractyloides A. Gray var. arguta (B.L. Rob.) Jeps.
- Brickellia Brachyphylla (A. Gray) A. Gray var. brachyphylla
- Brickellia Brachyphylla (A. Gray) A. Gray var. hinckleyi (Standl.) Flyr
- Brickellia Brachyphylla (A. Gray) A. Gray var. terlinguensis Flyr
- Brickellia Californica (Torr. & A. Gray) A. Gray var. desertorum (Coville) Parish ex H.
- Brickellia Chlorolepis (Wooton & Standl.) Shinners
- Brickellia Diffusa (Vahl) A. Gray [excluded]
- Brickellia Eupatorioides (L.) Shinners var. ozarkana (Shinners) Shinners
- Brickellia Fendleri A. Gray
- Brickellia Grandiflora (Hook.) Nutt. var. petiolaris A. Gray
- Brickellia Lemmonii A. Gray var. nelsonii (B.L. Rob.) B.L. Turner
- Brickellia Leptophylla (Scheele) Shinners
- Brickellia Leptophylla (Scheele) Shinners var. mexicana (Shinners) Shinners
- Brickellia Linifolia D.C. Eaton
- Brickellia Microphylla (Nutt.) A. Gray ssp. scabra (A. Gray) W.A. Weber
- Brickellia Mosieri (Small) Shinners
- Brickellia Multiflora Kellogg
- Brickellia Oblongifolia Nutt. var. typica B.L. Rob.
- Brickellia Rosemarinifolia (Vent.) W.A. Weber var. chlorolepis (Wooton & Standl.) W.A. Webe
- Brickellia Rosemarinifolia (Vent.) W.A. Weber, orth. var.
- Brickellia Rosmarinifolia (Vent.) W.A. Weber
- Brickellia Rosmarinifolia (Vent.) W.A. Weber ssp. chlorolepis (Wooton & Standl.) W.A. Webe
- Brickellia Scabra (A. Gray) A. Nelson ex B.L. Rob.
- Brickellia Shaffneri (A. Gray) Shinners
- Brickellia Shineri M.E. Jones ex Flyr
- Brickellia Squamulosa A. Gray
- Brickellia Viejensis Flyr
- Brickellia Watsonii B.L. Rob.
- Bridal Bouquet - Poranopsis Paniculata (Roxb.) Roberty
- Bridal Broom - Retama Monosperma (L.) Boiss.
- Bridal Broom - Retama Raf.
- Bridalveil - Gibasis Raf.
- Bridalwreath Spirea - Spiraea Prunifolia Siebold & Zucc.
- Bride's Bonnet - Clintonia Uniflora (Menzies ex Schult. & Schult. f.) Kunth
- Bride's Feathers - Aruncus Dioicus (Walter) Fernald
- Bride's Feathers - Aruncus Dioicus (Walter) Fernald var. acuminatus (Rydb.) Rydb. ex H. Hara
- Bride's Feathers - Aruncus Dioicus (Walter) Fernald var. dioicus
- Bride's Feathers - Aruncus Dioicus (Walter) Fernald var. pubescens (Rydb.) Fernald
- Bride's Feathers - Aruncus Dioicus (Walter) Fernald var. vulgaris (Maxim.) H. Hara
- Bridelia Willd.
- Bridge Penstemon - Penstemon Rostriflorus Kellogg
- Bridger Mountain Alumroot - Heuchera Flabellifolia Rydb.
- Bridger Mountain Alumroot - Heuchera Flabellifolia Rydb. var. flabellifolia
- Bridger Mountain Alumroot - Heuchera Flabellifolia Rydb. var. subsecta Rosend., Butters & Lakela
- Bridges' Brodiaea - Triteleia Bridgesii (S. Watson) Greene
- Bridges' Catchfly - Silene Bridgesii Rohrb.
- Bridges' Cliffbrake - Pellaea Bridgesii Hook.
- Bridges' Gilia - Navarretia Leptalea (A. Gray) L.A. Johnson ssp. bicolor (H. Mason & A.D. Grant) L.A.
- Bridges' Gilia - Navarretia Leptalea (A. Gray) L.A. Johnson ssp. leptalea
- Bridges' Pincushionplant - Navarretia Leptalea (A. Gray) L.A. Johnson
- Bridgotree - Chionanthus Compactus Sw.
- Bridle Buckwheat - Eriogonum Meledonum Reveal
- Brigalow Grass - Setaria Brigalow R.D. Webster
- Brigantiaea Lichen - Brigantiaea Fuscolutea (Dicks.) R. Sant.
- Brigantiaea Lichen - Brigantiaea Leucoxantha (Spreng.) R. Sant. & Hafellner
- Brigantiaea Lichen - Brigantiaea Trevis.
- Brigantiaea Purpurata (Zahlbr.) Hafellner & Bellem.
- Brighamia - Brighamia A. Gray
- Brighamia Citrina (Forbes & Lydgate) H. St. John
- Brighamia Citrina (Forbes & Lydgate) H. St. John var. napaliensis H. St. John
- Brighamia Remyi H. St. John
- Bright Copper Homalothecium Moss - Homalothecium Aeneum (Mitt.) E. Lawton
- Bright Green Dudleya - Dudleya Virens (Rose) Moran
- Bright Green Dudleya - Dudleya Virens (Rose) Moran ssp. hassei (Rose) Moran
- Bright Green Dudleya - Dudleya Virens (Rose) Moran ssp. insularis (Rose) Moran
- Bright Green Dudleya - Dudleya Virens (Rose) Moran ssp. virens
- Bright Green Spikerush - Eleocharis Olivacea Torr.
- Bright Green Spikerush - Eleocharis Olivacea Torr. var. olivacea
- Bright Green Spikerush - Eleocharis Olivacea Torr. var. reductiseta (Schuyler & Ferren) Schuyler & Ferren
- Bright Navarretia - Navarretia Paradoxiclara L.A. Johnson & D. Gowen
- Brightblue Speedwell - Veronica Serpyllifolia L. ssp. humifusa (Dicks.) Syme
- Brighteyes - Reichardia Roth
- Brightgreen Spleenwort - Asplenium Trichomanes-ramosum L.
- Brightwhite - Prenanthella Exigua (A. Gray) Rydb.
- Brilliant Campion - Lychnis Fulgens Fisch. ex Sims
- Brilliant Red Dung Moss - Splachnum Rubrum Hedw.
- Brintonia Discoidea (Elliott) Greene
- Brisselet - Erythroxylum Brevipes DC.
- Bristle Bent - Agrostis Curtisii Kerguelen
- Bristle Berry - Rubus Notatus L.H. Bailey
- Bristle Fern - Trichomanes Javanicum Blume
- Bristle Fern - Trichomanes Javanicum Blume var. boryanum (Kuntze) Fosberg
- Bristle Fern - Trichomanes L.
- Bristle Flax - Linum Aristatum Engelm.
- Bristle Nailwort - Paronychia Setacea Torr. & A. Gray
- Bristle Nailwort - Paronychia Setacea Torr. & A. Gray var. longibracteata Chaudhri
- Bristle Nailwort - Paronychia Setacea Torr. & A. Gray var. setacea
- Bristlecone Cryptantha - Cryptantha Roosiorum Munz
- Bristlecone Fir - Abies Bracteata (D. Don) D. Don ex Poit.
- Bristlecone Pine - Pinus Aristata Engelm.
- Bristlecup Sandmat - Chamaesyce Chaetocalyx (Boiss.) Wooton & Standl.
- Bristlecup Sandmat - Chamaesyce Chaetocalyx (Boiss.) Wooton & Standl. var. chaetocalyx
- Bristlecup Sandmat - Chamaesyce Chaetocalyx (Boiss.) Wooton & Standl. var. triligulata (L.C. Wheeler) Mayfie
- Bristleflower Collomia - Collomia Macrocalyx Leiberg ex Brand
- Bristlefruit Hedgeparsley - Torilis Leptophylla (L.) Rchb. f.
- Bristlegrass - Setaria P. Beauv.
- Bristlehead - Carphochaete A. Gray
- Bristleleaf Bulrush - Isolepis Setacea (L.) R. Br.
- Bristleleaf Chaffhead - Carphephorus Pseudoliatris Cass.
- Bristleleaf Lovegrass - Eragrostis Chaetophylla Steud.
- Bristleleaf Pricklyleaf - Thymophylla Tenuiloba (DC.) Small
- Bristleleaf Pricklyleaf - Thymophylla Tenuiloba (DC.) Small var. tenuiloba
- Bristleleaf Sedge - Carex Eburnea Boott
- Bristlemallow - Modiola Moench
- Bristleseed Sandspurry - Spergularia Echinosperma (Celak.) Asch. & Graebn.
- Bristletips - Oxyspora Paniculata (D. Don) DC.
- Bristleweed - Hazardia Greene
- Bristly Bedstraw - Galium Uncinulatum DC.
- Bristly Bristle Fern - Trichomanes Setigerum Backh. ex T. Moore
- Bristly Buttercup - Ranunculus Hispidus Michx.
- Bristly Buttercup - Ranunculus Hispidus Michx. var. caricetorum (Greene) T. Duncan
- Bristly Buttercup - Ranunculus Hispidus Michx. var. hispidus
- Bristly Buttercup - Ranunculus Hispidus Michx. var. nitidus (Chapm.) T. Duncan
- Bristly Cryptantha - Cryptantha Setosissima (A. Gray) Payson
- Bristly Dewberry - Rubus Hispidus L.
- Bristly Dogstail Grass - Cynosurus Echinatus L.
- Bristly Fiddleneck - Amsinckia Tessellata A. Gray
- Bristly Fiddleneck - Amsinckia Tessellata A. Gray var. gloriosa (Eastw. ex Suksd.) Hoover
- Bristly Fiddleneck - Amsinckia Tessellata A. Gray var. tessellata
- Bristly Flatsedge - Cyperus Hystricinus Fernald
- Bristly Gentian - Gentiana Plurisetosa C.T. Mason
- Bristly Greenbrier - Smilax Tamnoides L.
- Bristly Hawkbit - Leontodon Hispidus L.
- Bristly Hawkbit - Leontodon Hispidus L. ssp. danubialis (Jacq.) Simonkai
- Bristly Hawkbit - Leontodon Hispidus L. ssp. hispidus
- Bristly Hawksbeard - Crepis Setosa Haller f.
- Bristly Jewelflower - Streptanthus Glandulosus Hook.
- Bristly Jewelflower - Streptanthus Glandulosus Hook. ssp. glandulosus
- Bristly Linanthus - Leptosiphon Acicularis (Greene) Jeps.
- Bristly Locust - Robinia Hispida L.
- Bristly Locust - Robinia Hispida L. var. fertilis (Ashe) R.T. Clausen
- Bristly Locust - Robinia Hispida L. var. hispida
- Bristly Locust - Robinia Hispida L. var. nana (Elliott) DC.
- Bristly Locust - Robinia Hispida L. var. rosea Pursh
- Bristly Lovegrass - Cladoraphis Cyperoides (Thunb.) S.M. Phillips
- Bristly Lovegrass - Cladoraphis Franch.
- Bristly Matilija Poppy - Romneya Trichocalyx Eastw.
- Bristly Mousetail - Myosurus Apetalus C. Gay
- Bristly Mousetail - Myosurus Apetalus C. Gay var. borealis Whittemore
- Bristly Mousetail - Myosurus Apetalus C. Gay var. montanus (G.R. Campb.) Whitemore
- Bristly Nama - Nama Hispidum A. Gray
- Bristly Nootka Rose - Rosa Nutkana C. Presl var. hispida Fernald
- Bristly Oswego Blackberry - Rubus Dissimilis L.H. Bailey
- Bristly Oxtongue - Picris Echioides L.
- Bristly Sarsaparilla - Aralia Hispida Vent.
- Bristly Scaleseed - Spermolepis Echinata (Nutt. ex DC.) A. Heller
- Bristly Smartweed - Polygonum Hispidum Kunth
- Bristly Speargrass - Piptochaetium Fuscum (Steud.) Barkworh, Ciald. & Gandhi
- Bristly Stickseed - Hackelia Setosa (Piper) I.M. Johnst.
- Bristly Stingingbush - Malpighia Setosa Spreng.
- Bristly Wolfstail - Lycurus Setosus (Nutt.) C.G. Reeder
- Bristlyleaf Rockcress - Arabis Rectissima Greene
- Bristlyleaf Rockcress - Arabis Rectissima Greene var. rectissima
- Bristlyleaf Rockcress - Arabis Rectissima Greene var. simulans Rollins
- Bristlystalked Sedge - Carex Leptalea Wahlenb.
- Bristlystalked Sedge - Carex Leptalea Wahlenb. ssp. leptalea
- Bristlystem Checkerbloom - Sidalcea Hirtipes C.L. Hitchc.
- British Alkaligrass - Puccinellia Rupestris (With.) Fernald & Weath.
- British Columbia Wildginger - Asarum Caudatum Lindl.
- British Felt Lichen - Peltigera Britannica (Gyel.) Holt.-Hartw. & Tonsb.
- British Soldier Lichen - Cladonia Cristatella Tuck.
- British Timothy - Phleum Paniculatum Huds.
- British Yellowhead - Inula Britannica L.
- Brittle Bladderfern - Cystopteris Fragilis (L.) Bernh.
- Brittle Lichen - Cornicularia (schreb.) Hoffm.
- Brittle Lichen - Cornicularia Normoerica (Gunnerus) Du Rietz
- Brittle Pricklypear - Opuntia Fragilis (Nutt.) Haw.
- Brittle Sandwort - Minuartia Nuttallii (Pax) Briq. ssp. fragilis (Maguire & A.H. Holmgren) McNeill
- Brittle Sandwort - Minuartia Nuttallii (Pax) Briq. ssp. gracilis (B.L. Rob.) McNeill
- Brittle Sandwort - Minuartia Nuttallii (Pax) Briq. ssp. gregaria (A. Heller) McNeill
- Brittle Spineflower - Chorizanthe Brevicornu Torr.
- Brittle Spineflower - Chorizanthe Brevicornu Torr. var. brevicornu
- Brittle Spineflower - Chorizanthe Brevicornu Torr. var. spathulata (Small ex Rydb.) C.L. Hitchc.
- Brittle Waternymph - Najas Minor All.
- Brittlebush - Encelia Adans.
- Brittlebush - Encelia Farinosa A. Gray ex Torr.
- Brittled Gum - Eucalyptus Mannifera Mudie ssp. maculosa (R.T. Baker) L.A.S. Johnson
- Brittleleaf - Gonocalyx Planch. & Linden
- Brittleleaf Manzanita - Arctostaphylos Tomentosa (Pursh) Lindl. ssp. crustacea (Eastw.) P.V. Wells
- Brittlescale - Atriplex Depressa Jeps.
- Brittlestem Hempnettle - Galeopsis Tetrahit L.
- Brittlestem Hempnettle - Galeopsis Tetrahit L. var. arvensis Schltdl.
- Brittlestem Hempnettle - Galeopsis Tetrahit L. var. tetrahit
- Brittlestem - Mabrya Acerifolia (Pennell) Elisens
- Britton's Beargrass - Nolina Brittoniana Nash
- Britton's Centaury - Centaurium Quitense (Kunth) B.L. Rob.
- Britton's Dry Rock Moss - Grimmia Brittoniae R.S. Williams
- Britton's Maiden Fern - Thelypteris Brittonae (Slosson ex Maxon) Alain
- Britton's Phlox - Phlox Subulata L. ssp. brittonii (Small) Wherry
- Britton's Sedge - Carex Tetrastachya Scheele
- Britton's Shadow Witch - Ponthieva Brittoniae Ames
- Britton's Skullcap - Scutellaria Brittonii Porter
- Britton's Spikerush - Eleocharis Brittonii Svens. ex Small
- Britton's Wild Petunia - Ruellia Caerulea Morong
- Briza Australis Prokudin
- Briza Elatior Sm.
- Briza Fusca (Parodi) Parodi
- Briza Lamarckiana Nees
- Briza Media L. ssp. elatior (Sm.) Rohlena
- Briza Spicata Sm.
- Briza Stricta (Hook. & Arn.) Steud.
- Briza Subaristata Lam.
- Briza Triloba Nees
- Briza Uniolae (Nees) Steud.
- Brizopyrum Obtusiflorum Fourn.
- Broad Beechfern - Phegopteris Hexagonoptera (Michx.) Fée
- Broad Fleabane - Erigeron Latus (A. Nelson & J.F. Macbr.) Cronquist
- Broad Halberd Fern - Tectaria Heracleifolia (Willd.) Underw.
- Broad Looseflower Sedge - Carex Laxiflora Lam.
- Broad Looseflower Sedge - Carex Laxiflora Lam. var. laxiflora
- Broad Looseflower Sedge - Carex Laxiflora Lam. var. serrulata F.J. Herm.
- Broad Stalkgrass - Pharus Latifolius L.
- Broad-leaf Gilia - Aliciella Latifolia (S. Watson) J.M. Porter
- Broad-leaf Mullein - Verbascum Pulverulentum Vill.
- Broad-leaf Sweetleaf - Symplocos Latifolia Krug & Urb.
- Broad-leaf Yellow Loosestrife - Lysimachia Pendens Marr
- Broadbeaked Mustard - Brassica Narinosa L.H. Bailey
- Broadbeard Beardtongue - Penstemon Angustifolius Nutt. ex Pursh
- Broadbeard Beardtongue - Penstemon Angustifolius Nutt. ex Pursh var. angustifolius
- Broadbeard Beardtongue - Penstemon Angustifolius Nutt. ex Pursh var. caudatus (A. Heller) Rydb.
- Broadbeard Beardtongue - Penstemon Angustifolius Nutt. ex Pursh var. dulcis Neese
- Broadbeard Beardtongue - Penstemon Angustifolius Nutt. ex Pursh var. venosus (D.D. Keck) N.H. Holmgren
- Broadbeard Beardtongue - Penstemon Angustifolius Nutt. ex Pursh var. vernalensis N.H. Holmgren
- Broadfruit Bur-reed - Sparganium Eurycarpum Engelm.
- Broadfruit Combseed - Pectocarya Platycarpa (Munz & I.M. Johnst.) Munz & I.M. Johnst.
- Broadfruit Horned Beaksedge - Rhynchospora Careyana Fernald
- Broadfruit Mariposa Lily - Calochortus Nitidus Douglas
- Broadkeel Milkvetch - Astragalus Platytropis A. Gray
- Broadleaf Aiea - Nothocestrum Latifolium A. Gray
- Broadleaf Arnica - Arnica Latifolia Bong.
- Broadleaf Arrowhead - Sagittaria Latifolia Willd.
- Broadleaf Bamboo - Sasa Makino & Shib.
- Broadleaf Bamboo - Sasa Palmata (hort. ex Burb.) E.G. Camas
- Broadleaf Barbara's Buttons - Marshallia Trinervia (Walter) Trel.
- Broadleaf Beardtongue - Penstemon Platyphyllus Rydb.
- Broadleaf Bluebells - Mertensia Platyphylla A. Heller
- Broadleaf Bluebells - Mertensia Platyphylla A. Heller var. platyphylla
- Broadleaf Bluebells - Mertensia Platyphylla A. Heller var. subcordata (Greene) L.O. Williams
- Broadleaf Bluegrass - Poa Chaixii Vill.
- Broadleaf Caper - Capparis Hastata Jacq.
- Broadleaf Carpetgrass - Axonopus Compressus (Sw.) P. Beauv.
- Broadleaf Cattail - Typha Latifolia L.
- Broadleaf Cottonrose - Filago Pyramidata L.
- Broadleaf Enchanter's Nightshade - Circaea Lutetiana L.
- Broadleaf Enchanter's Nightshade - Circaea Lutetiana L. ssp. canadensis (L.) Asch. & Magnus
- Broadleaf False Buttonweed - Spermacoce Ovalifolia (M. Martens & Galeotti) Hemsl.
- Broadleaf False Carrot - Turgenia Latifolia (L.) Hoffm.
- Broadleaf Forget-me-not - Myosotis Latifolia Poir.
- Broadleaf Four O'clock - Mirabilis Decipiens (Standl.) Standl.
- Broadleaf Gilia - Aliciella Latifolia (S. Watson) J.M. Porter ssp. imperialis (S.L. Welsh) J.M. Porter
- Broadleaf Gilia - Aliciella Latifolia (S. Watson) J.M. Porter ssp. latifolia
- Broadleaf Glandweed - Parentucellia Latifolia (L.) Caruel
- Broadleaf Groundcherry - Physalis Latiphysa Waterf.
- Broadleaf Hawthorn - Crataegus Dilatata Sarg.
- Broadleaf Helleborine - Epipactis Helleborine (L.) Crantz
- Broadleaf Ironweed - Vernonia Glauca (L.) Willd.
- Broadleaf Knotweed - Polygonum Minimum S. Watson
- Broadleaf Lancepod - Lonchocarpus Heptaphyllus (Poir.) DC.
- Broadleaf Lupine - Lupinus Latifolius Lindl. ex J. Agardh
- Broadleaf Lupine - Lupinus Latifolius Lindl. ex J. Agardh ssp. dudleyi (Rydb.) Kenney & D. Dunn
- Broadleaf Lupine - Lupinus Latifolius Lindl. ex J. Agardh ssp. latifolius
- Broadleaf Lupine - Lupinus Latifolius Lindl. ex J. Agardh ssp. leucanthus (Rydb.) Kenney & D. Dunn
- Broadleaf Lupine - Lupinus Latifolius Lindl. ex J. Agardh ssp. longipes (Greene) Kenney & D. Dunn
- Broadleaf Lupine - Lupinus Latifolius Lindl. ex J. Agardh ssp. parishii (C.P. Sm.) Kenney & D. Dunn
- Broadleaf Lupine - Lupinus Latifolius Lindl. ex J. Agardh ssp. viridifolius (A. Heller) Kenney & D. Du
- Broadleaf Lupine - Lupinus Latifolius Lindl. ex J. Agardh ssp. viridifolius (A. Heller) Kenney & D. Du
- Broadleaf Lupine - Lupinus Latifolius Lindl. ex J. Agardh ssp. viridifolius (A. Heller) Kenney & D. Du
- Broadleaf Maiden Fern - Thelypteris Angustifolia (Willd.) Proctor
- Broadleaf Maidenhair - Adiantum Latifolium Lam.
- Broadleaf Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. chartaceus M.E. Jones
- Broadleaf Milkweed - Asclepias Latifolia (Torr.) Raf.
- Broadleaf Monkeyflower - Mimulus Latifolius A. Gray
- Broadleaf Noddingcaps - Triphora Amazonica Schltr.
- Broadleaf Panicum - Panicum Deustum Thunb.
- Broadleaf Papala - Charpentiera Obovata Gaudich.
- Broadleaf Peppermint Gum - Eucalyptus Dives Schauer
- Broadleaf Pondweed - Stuckenia Striata (Ruiz & Pav.) Holub
- Broadleaf Rice - Oryza Latifolia Desv.
- Broadleaf Rosette Grass - Dichanthelium Latifolium (L.) Gould & C.A. Clark
- Broadleaf Rush - Juncus Planifolius R. Br.
- Broadleaf Sedge - Carex Platyphylla Carey
- Broadleaf Signalgrass - Urochloa Platyphylla (Munro ex C. Wright) R.D. Webster
- Broadleaf Solomon's Seal - Polygonatum Hirsutum (Bosc ex Poir.) Pursh
- Broadleaf Speedwell - Veronica Austriaca L.
- Broadleaf Speedwell - Veronica Austriaca L. ssp. teucrium (L.) D.A. Webb
- Broadleaf Spurge - Euphorbia Platyphyllos L.
- Broadleaf Starflower - Trientalis Borealis Raf. ssp. latifolia (Hook.) Hultén
- Broadleaf Stonecrop - Sedum Spathulifolium Hook.
- Broadleaf Stonecrop - Sedum Spathulifolium Hook. ssp. pruinosum (Britton) R.T. Clausen & Uhl
- Broadleaf Stonecrop - Sedum Spathulifolium Hook. ssp. spathulifolium
- Broadleaf Tickseed - Coreopsis Latifolia Michx.
- Broadleaf Tonguefern - Elaphoglossum Latifolium (Sw.) J. Sm.
- Broadleaf Wild Leek - Allium Ampeloprasum L.
- Broadleaf Wild Leek - Allium Atroviolaceum Boiss.
- Broadleaf Woodsorrel - Oxalis Latifolia Kunth
- Broadleaved Lavender - Lavandula Latifolia Medikus
- Broadleaved Pepperweed - Lepidium Latifolium L.
- Broadlipped Twayblade - Listera Convallarioides (Sw.) Nutt. ex Elliott
- Broadlobe Phacelia - Phacelia Platyloba A. Gray
- Broadnineleaf Biscuitroot - Lomatium Triternatum (Pursh) J.M. Coult. & Rose var. anomalum (M.E. Jones ex J.M. Cou
- Broadpetal Gentian - Gentiana Platypetala Griseb.
- Broadpod Draba - Draba Platycarpa Torr. & A. Gray
- Broadpod Jewelflower - Streptanthus Platycarpus A. Gray
- Broadpod Nicker - Pomaria Brachycarpa (A. Gray) B. Simpson
- Broadscale Sedge - Carex Platylepis Mack.
- Broadsepal Saxifrage - Saxifraga Platysepala (Trautv.) Tolm.
- Broadsepal Yellowhood - Nissolia Platycalyx S. Watson
- Broadsheath Desertparsley - Lomatium Vaginatum J.M. Coult. & Rose
- Broadstemmed Onion - Allium Platycaule S. Watson
- Broadtooth Hedgenettle - Stachys Latidens Small ex Britton
- Broadtooth Lady's Mantle - Alchemilla Subcrenata Buser
- Broadtooth Monkeyflower - Mimulus Latidens (A. Gray) Greene
- Broadvein Sedge - Carex Lativena S.D. Jones & G.D. Jones
- Broadwing Sedge - Carex Alata Torr.
- Broccoli - Brassica Oleracea L. var. botrytis L.
- Brodiaea Bridgesii S. Watson
- Brodiaea - Brodiaea Sm.
- Brodiaea Californica Lindl. var. californica
- Brodiaea Californica Lindl. var. leptandra (Greene) Hoover
- Brodiaea Capitata Benth.
- Brodiaea Clementina (Hoover) Munz
- Brodiaea Congesta Sm.
- Brodiaea Coronaria (Salisb.) Engl. var. kernensis Hoover
- Brodiaea Coronaria (Salisb.) Engl. var. macropoda (Torr.) Hoover
- Brodiaea Coronaria (Salisb.) Engl. var. rosea (Greene) Hoover
- Brodiaea Crocea (Alph. Wood) S. Watson
- Brodiaea Crocea (Alph. Wood) S. Watson var. modesta (H.M. Hall) Munz
- Brodiaea Dissimulata M. Peck
- Brodiaea Douglasii S. Watson
- Brodiaea Douglasii S. Watson var. howellii (S. Watson) M. Peck
- Brodiaea Dudleyi (Hoover) Munz
- Brodiaea Elegans Hoover var. australis Hoover
- Brodiaea Elegans Hoover var. mundula (Jeps.) Hoover
- Brodiaea Gracilis S. Watson
- Brodiaea Grandiflora (Lindl.) J.F. Macbr.
- Brodiaea Grandiflora (Lindl.) J.F. Macbr. var. minor Benth.
- Brodiaea Hendersonii (Greene) S. Watson
- Brodiaea Hendersonii (Greene) S. Watson var. galeae M. Peck
- Brodiaea Howellii S. Watson
- Brodiaea Hyacinthina (Lindl.) Baker
- Brodiaea Hyacinthina (Lindl.) Baker var. greenei (Hoover) Munz
- Brodiaea Hyacinthina (Lindl.) Baker var. lactea Baker
- Brodiaea Ida-maia (Alph. Wood) Greene
- Brodiaea Laxa (Benth.) S. Watson
- Brodiaea Laxa (Benth.) S. Watson var. candida (Greene) Jeps.
- Brodiaea Laxa (Benth.) S. Watson var. nimia Jeps.
- Brodiaea Laxa (Benth.) S. Watson var. tracyi Jeps.
- Brodiaea Leachiae M. Peck
- Brodiaea Lemmoniae S. Watson
- Brodiaea Leptandra (Greene) Baker
- Brodiaea Lugens (Greene) Baker
- Brodiaea Lutea (Lindl.) Morton
- Brodiaea Lutea (Lindl.) Morton var. anilina (Greene) Munz
- Brodiaea Lutea (Lindl.) Morton var. cookii (Hoover) Munz
- Brodiaea Lutea (Lindl.) Morton var. scabra (Greene) Munz
- Brodiaea Minor (Benth.) S. Watson var. nana (Hoover) Hoover
- Brodiaea Multiflora Benth.
- Brodiaea Palmeri S. Watson
- Brodiaea Peduncularis (Lindl.) S. Watson
- Brodiaea Pulchella (Salisb.) Greene
- Brodiaea Pulchella (Salisb.) Greene var. pauciflora (Torr.) Morton
- Brodiaea Purdyi Eastw.
- Brodiaea Rosea (Greene) Baker
- Brodiaea Scabra (Greene) Baker
- Brodiaea Scabra (Greene) Baker var. anilina (Greene) M. Peck
- Brodiaea Synandra Jeps. var. insignis Jeps.
- Brodiaea Uniflora (Lindl.) Engl.
- Brodiaea Venusta (Greene) Greene
- Brodiaea Versicolor (Hoover) Munz
- Brodiaea Volubilis (Kellogg) Baker
- Brodoa Intestiniformis (Vill.) Goward
- Brodoa Lichen - Brodoa Goward
- Brome - Bromus L.
- Brome Fescue - Vulpia Bromoides (L.) Gray
- Brome-like Sedge - Carex Bromoides Schkuhr ex Willd.
- Brome-like Sedge - Carex Bromoides Schkuhr ex Willd. ssp. bromoides
- Brome-like Sedge - Carex Bromoides Schkuhr ex Willd. ssp. montana Naczi
- Bromelia Balansae Mez [excluded]
- Bromelia - Bromelia L.
- Bromelia Comosa L.
- Bromelia Plumieri (E. Morren) L.B. Sm. [excluded]
- Bromelica Bulbosa (Geyer ex Porter & J.M. Coult.) W.A. Weber
- Bromelica Smithii (Porter ex A. Gray) Farw.
- Bromelica Spectabilis (Scribn.) W.A. Weber
- Bromelica Subulata (Griseb.) Farw.
- Bromopsis Anomala (Rupr. ex Fourn.) Holub
- Bromopsis Biebersteinii (Roem. & Schult.) Holub
- Bromopsis Canadensis (Michx.) Holub
- Bromopsis Canadensis (Michx.) Holub ssp. richardsonii (Link) Tzvelev
- Bromopsis Ciliata (L.) Holub
- Bromopsis Dicksonii (Mitchell & Wilton) Á. Löve & D. Löve
- Bromopsis Erecta (Huds.) Fourr.
- Bromopsis Frondosa (Shear) Holub
- Bromopsis Grandis (Shear) Holub
- Bromopsis Inermis (Leyss.) Holub
- Bromopsis Inermis (Leyss.) Holub ssp. pumpelliana (Scribn.) W.A. Weber
- Bromopsis Kalmii (A. Gray) Holub
- Bromopsis Lanatipes (Shear) Holub
- Bromopsis Mucroglumis (Wagnon) Holub
- Bromopsis Nottowayana (Fernald) Holub
- Bromopsis Orcuttiana (Vasey) Holub
- Bromopsis Pacifica (Shear) Holub
- Bromopsis Porteri J.M. Coult.
- Bromopsis Pseudolaevipes (Wagnon) Holub
- Bromopsis Pubescens (Muhl. ex Willd.) Holub
- Bromopsis Pumpelliana (Scribn.) Holub
- Bromopsis Pumpelliana (Scribn.) Holub ssp. arctica (Shear ex Scribn. & Merr.) Á. Löve
- Bromopsis Ramosa (Huds.) Holub
- Bromopsis Richardsonii (Link) Holub
- Bromopsis Suksdorfii (Vasey) Holub
- Bromopsis Texensis (Shear) Holub
- Bromopsis Vulgaris (Hook.) Holub
- Bromus Adoensis Hochst. ex Steud.
- Bromus Altissimus Pursh
- Bromus Anatolicus Boiss. & Heldr.
- Bromus Anomalus Rupr. ex Fourn. var. lanatipes (Shear) Hitchc.
- Bromus Anomalus auct. non Rupr. ex Fourn.
- Bromus Arduennensis Dumort.
- Bromus Asper Murray
- Bromus Auleticus Trin. ex Nees
- Bromus Barcensis Simonk.
- Bromus Benekenii (Lange) Trimen
- Bromus Berterianus Colla, orth. var.
- Bromus Brachyanthera Döll
- Bromus Brachyanthera Döll ssp. uruguayensis (Arechav.) Roseng., B.R. Arrill. & Izag.
- Bromus Brachystachys Hornung
- Bromus Breviaristatus Buckley
- Bromus Brevis Nees ex Steud.
- Bromus Brizaeformis Fisch. & C.A. Mey., orth. var.
- Bromus Bromoideus (Lej.) Crép.
- Bromus Canadensis Michx.
- Bromus Cappadocicus Boiss. & Balansa
- Bromus Carinatus Hook. & Arn. var. californicus (Nutt. ex Buckley) Shear
- Bromus Carinatus Hook. & Arn. var. carinatus
- Bromus Carinatus Hook. & Arn. var. hookerianus (Thurb.) Shear
- Bromus Carinatus Hook. & Arn. var. linearis Shear
- Bromus Carinatus Hook. & Arn. var. marginatus (Nees ex Steud.) Barkworth & Andert
- Bromus Carinatus Hook. & Arn. var. maritimus (Piper) C.L. Hitchc.
- Bromus Ciliatus L. var. coloradensis Vasey ex Beal
- Bromus Ciliatus L. var. genuinus Fernald
- Bromus Ciliatus L. var. intonsus Fernald
- Bromus Ciliatus L. var. laeviglumis Scribn. ex Shear
- Bromus Commutatus Schrad.
- Bromus Commutatus Schrad. var. apricorum Simonkai
- Bromus Dertonensis All.
- Bromus Diandrus Roth var. rigidus (Roth) Sales
- Bromus Distachyos L.
- Bromus Dudleyi Fernald
- Bromus Erectus Huds. var. hackelii Borbas
- Bromus Erectus Huds. var. vernalis Pancic
- Bromus Ferronii Mabille
- Bromus Giganteus L.
- Bromus Gussonei Parl.
- Bromus Haenkeanus (J. Presl) Kunth
- Bromus Hordeaceus L. ssp. ferronii (Mabille) P.M. Sm.
- Bromus Hordeaceus L. ssp. molliformis (Lloyd) Maire & Weiller
- Bromus Inermis Leyss. var. aristatus Schur ex Scribn. & Merr.
- Bromus Inermis Leyss. var. purpurascens (Hook.) Wagnon
- Bromus Inermis Leyss. var. tweedyi (Scribn. ex Beal) C.L. Hitchc.
- Bromus Intermedius Guss.
- Bromus Interruptus (Hack.) Druce
- Bromus Japonicus Thunb.
- Bromus Japonicus Thunb. ssp. anatolicus (Boiss. & Heldr.) Penzes
- Bromus Japonicus Thunb. var. porrectus Hack.
- Bromus Laciniatus Beal
- Bromus Lanceolatus Roth var. lanuginosus (Poir.) Dinsm.
- Bromus Luzonensis J. Presl
- Bromus Macranthos E. Desv.
- Bromus Macrostachys Desf.
- Bromus Macrostachys Desf. var. lanuginosus (Poir.) Coss. & Durieu
- Bromus Madritensis L. ssp. madritensis
- Bromus Madritensis L. ssp. rubens (L.) Duvin
- Bromus Marginatus Nees ex Steud. var. breviaristatus (Buckley) Beetle
- Bromus Marginatus Nees ex Steud. var. latior Shear
- Bromus Marginatus Nees ex Steud. var. seminudus Shear
- Bromus Matritensis L. ssp. rubens (L.) Duvin, orth. var.
- Bromus Matritensis L., orth. var.
- Bromus Maximus Desf., non Gilib.
- Bromus Molliformis Lloyd
- Bromus Mollis L. var. leiostachys Hartm.
- Bromus Mollis auct. non L.
- Bromus Orcuttianus Vasey var. hallii Hitchc.
- Bromus Oxyodon Schrenk
- Bromus Paniculatus (Shear) Rydb.
- Bromus Pannonicus Kumm. & Sendtn.
- Bromus Patulus Mert. & W.D.J. Koch
- Bromus Pectinatus Thunb.
- Bromus Popovii Drobow
- Bromus Porteri (J.M. Coult.) Nash var. lanatipes Shear
- Bromus Pseudodanthoniae Drobow
- Bromus Pseudothominii P.M. Sm. (pro hybr.)
- Bromus Pubescens Muhl. ex Willd. var. laeviglumis (Scribn. ex Shear) Swallen
- Bromus Pumpellianus Scribn.
- Bromus Pumpellianus Scribn. ssp. dicksonii Mitchell & Wilton
- Bromus Pumpellianus Scribn. var. arcticus (Shear ex Scribn. & Merr.) A.E. Porsild
- Bromus Pumpellianus Scribn. var. tweedyi Scribn. ex Beal
- Bromus Pumpellianus Scribn. var. villosissimus Hultén
- Bromus Purgans L. var. laeviglumis (Scribn. ex Shear) Swallen
- Bromus Purgans L., nom. utique rej.
- Bromus Purgans auct. non L.
- Bromus Ramosus Huds. ssp. benekenii (Lange) Lindb.
- Bromus Richardsonii Link
- Bromus Richardsonii Link var. pallidus (Hook.) Shear
- Bromus Rigidus Roth
- Bromus Rigidus Roth var. gussonei (Parl.) Coss. & Durieu
- Bromus Secalinus L. ssp. grossus (Desf. ex DC.) Domin
- Bromus Secalinus L. var. grossus (Desf. ex DC.) Neilr.
- Bromus Secalinus L. var. hirsutus Kindb.
- Bromus Secalinus L. var. hirtus (F.W. Schultz) Hegi
- Bromus Secalinus L. var. velutinus (Schrad.) W.D.J. Koch
- Bromus Secundus J. Presl
- Bromus Setifolius J. Presl
- Bromus Setifolius J. Presl var. brevifolius Nees
- Bromus Sibiricus Drobow
- Bromus Sitchensis Trin. var. aleutensis (Trin. ex Griseb.) Hultén
- Bromus Sitchensis Trin. var. marginatus (Nees ex Steud.) B. Boivin
- Bromus Spicatus Nees
- Bromus Squarrosus L. var. villosus (C.C. Gmel.) Rchb. [excluded]
- Bromus Stenostachyus Boiss.
- Bromus Syriacus Boiss. & Blanche
- Bromus Tectorum L. var. glabratus Spenner
- Bromus Tectorum L. var. hirsutus Regel
- Bromus Tectorum L. var. nudus Klett & Richt.
- Bromus Thominei Hardham ex Nyman
- Bromus Tomentellus Boiss.
- Bromus Tomentosus Trin.
- Bromus Trinii Desv.
- Bromus Trinii Desv. var. excelsus Shear
- Bromus Unioloides Kunth
- Bromus Uruguayensis Arechav.
- Bromus Valdivianus Phil.
- Bromus Variegatus M. Bieb.
- Bromus Vernalis Pancic ex Hack.
- Bromus Villosus Forssk., non Scop.
- Bromus Vulgaris (Hook.) Shear var. eximius Shear
- Bromus Vulgaris (Hook.) Shear var. robustus Shear
- Bromus Willdenowii Kunth
- Brook Cinquefoil - Potentilla Rivalis Nutt.
- Brook Crowngrass - Paspalum Acuminatum Raddi
- Brook Saxifrage - Saxifraga Odontoloma Piper
- Brook Wakerobin - Trillium Rivale S. Watson
- Brookfoam - Boykinia Nutt.
- Brookfoam - Telesonix Raf.
- Brooks' Alsophila - Alsophila Brooksii (Maxon) R. Tryon
- Brookweed - Samolus L.
- Broom Bamboo - Phyllostachys Nidularia Munro
- Broom Brome - Bromus Scoparius L.
- Broom Crowberry - Corema Conradii (Torr.) Torr. ex Loudon
- Broom Cupflower - Nierembergia Scoparia Sendtn.
- Broom - Cytisus Desf.
- Broom - Cytisus ×dallimorei Rolfe
- Broom Dalea - Psorothamnus Scoparius (A. Gray) Rydb.
- Broom - Genista L.
- Broom Honeymyrtle - Melaleuca Uncinata R. Br.
- Broom Milkwort - Polygala Scoparioides Chod.
- Broom Sedge - Carex Scoparia Schkuhr ex Willd.
- Broom Sedge - Carex Scoparia Schkuhr ex Willd. var. scoparia
- Broom Sedge - Carex Scoparia Schkuhr ex Willd. var. tessellata Fernald & Wiegand
- Broom Silverbush - Argythamnia Fasciculata (Vahl ex A. Juss.) Müll. Arg.
- Broom Snakeweed - Gutierrezia Sarothrae (Pursh) Britton & Rusby
- Broom - Spartium L.
- Broom Teatree - Leptospermum Scoparium J.R. Forst. & G. Forst.
- Broom Wattle - Acacia Calamifolia Sweet ex Lindl.
- Broom-like Ragwort - Senecio Spartioides Torr. & A. Gray
- Broom-like Ragwort - Senecio Spartioides Torr. & A. Gray var. multicapitatus (Greenm. ex Rydb.) S.L. Wels
- Broom-like Ragwort - Senecio Spartioides Torr. & A. Gray var. spartioides
- Broombush False Willow - Baccharis Dioica Vahl
- Broomcorn Millet - Panicum Miliaceum L. ssp. miliaceum
- Broomcorn Millet - Panicum Miliaceum L. ssp. ruderale (Kitagawa) Tzvelev
- Broomleaf Toadflax - Linaria Genistifolia (L.) Mill.
- Broomrape - Orobanche L.
- Broomsage - Lepidospartum (a. Gray) A. Gray
- Broomsedge Bluestem - Andropogon Virginicus L.
- Broomsedge Bluestem - Andropogon Virginicus L. var. decipiens C.S. Campbell
- Broomsedge Bluestem - Andropogon Virginicus L. var. virginicus
- Broomstick - Trichilia Hirta L.
- Broomweed - Amphiachyris (a. DC.) Nutt.
- Broomwort - Scoparia Montevidensis (Spreng.) R.E. Fries
- Broomwort - Scoparia Montevidensis (Spreng.) R.E. Fries var. glandulifera (Fritsch) R.E. Fries
- Brosimum Aubletii Poeppig & Endl.
- Brosimum - Brosimum Sw.
- Brosimum Spurium Sw.
- Brosimum Uleanum Mildbr.
- Brothera Moss - Brothera Leana (Sull.) Müll. Hal.
- Brothera Moss - Brothera Müll. Hal.
- Brotherella Delicatula (James) Fleisch.
- Brotherella Moss - Brotherella Loeske ex Fleisch.
- Brotherella Tenuirostris (Bruch & Schimp.) Broth.
- Brouard's Dotted Lichen - Bacidia Brouardii (de Lesd.) Zahlbr.
- Brouard's Rim Lichen - Lecanora Brouardii (de Lesd.) ?, ined.?
- Brouard's Rinodina Lichen - Rinodina Brouardii de Lesd.
- Broughtonia - Broughtonia R. Br.
- Broussaisia Arguta Gaudich. var. pellucida (Gaudich.) Fosberg
- Broussaisia - Broussaisia Gaudich.
- Broussonetia - Broussonetia L'hér. ex Vent.
- Broussonetia Kazinoki Siebold
- Browallia - Browallia L.
- Browallia Texana Torr.
- Browallia Viscosa auct. non Kunth
- Brown Barrel - Eucalyptus Fastigata H. Deane & Maiden
- Brown Beaksedge - Rhynchospora Fusca (L.) W.T. Aiton
- Brown Bentgrass - Agrostis Vinealis Schreb.
- Brown Bentgrass - Agrostis Vinealis Schreb. ssp. vinealis
- Brown Dogwood - Cornus Glabrata Benth.
- Brown Flatsedge - Cyperus Fuscus L.
- Brown Fritillary - Fritillaria Micrantha A. Heller
- Brown Indianhemp - Hibiscus Cannabinus L.
- Brown Kurrajong - Commersonia Bartramia (L.) Merr.
- Brown Mallet - Eucalyptus Astringens (Maiden) Maiden
- Brown Moor Clover - Trifolium Spadiceum L.
- Brown Mustard - Brassica Juncea (L.) Czern.
- Brown Nicker - Caesalpinia Portoricensis (Britton & P. Wilson) Alain
- Brown Sedge - Carex Subfusca W. Boott
- Brown Stringybark - Eucalyptus Baxteri (Benth.) Maiden & Blakely ex J.M. Black
- Brown Stringybark - Eucalyptus Capitellata Sm.
- Brown Widelip Orchid - Liparis Liliifolia (L.) Rich. ex Ker Gawl.
- Brown's Amaranth - Amaranthus Brownii Christoph. & Caum
- Brown's Indian Rosewood - Dalbergia Brownei (Jacq.) Schinz
- Brown's Lovegrass - Eragrostis Brownii (Kunth) Nees
- Brown's Pea - Lathyrus Lanszwertii Kellogg var. brownii (Eastw.) Jeps.
- Brown's Peony - Paeonia Brownii Douglas ex Hook.
- Brown's Tetrodontium Moss - Tetrodontium Brownianum (Dicks.) Schwägr.
- Brown's Waterleaf - Hydrophyllum Brownei Kral & V.M. Bates
- Brown's Yellowtops - Flaveria Brownii A. Powell
- Brown-flower Butterfly Orchid - Epidendrum Anceps Jacq.
- Brown-woolly Fig - Ficus Drupacea Thunb.
- Brownbeard Rice - Oryza Rufipogon Griffiths
- Browne's Blechum - Ruellia Blechum L.
- Browne's Dock - Rumex Brownei Campd.
- Browne's Poisonwood - Metopium Brownei (Jacq.) Urb.
- Browne's Savory - Clinopodium Brownei (Sw.) Kuntze
- Browne's Wild Coffee - Psychotria Brownei Spreng.
- Browneyed Susan - Rudbeckia Triloba L.
- Browneyed Susan - Rudbeckia Triloba L. var. pinnatiloba Torr. & A. Gray
- Browneyed Susan - Rudbeckia Triloba L. var. rupestris (Chickering) A. Gray
- Browneyed Susan - Rudbeckia Triloba L. var. triloba
- Browneyes - Camissonia Claviformis (Torr. & Frém.) P.H. Raven
- Browneyes - Camissonia Claviformis (Torr. & Frém.) P.H. Raven ssp. aurantiaca (Munz) P.H. Raven
- Browneyes - Camissonia Claviformis (Torr. & Frém.) P.H. Raven ssp. claviformis
- Browneyes - Camissonia Claviformis (Torr. & Frém.) P.H. Raven ssp. cruciformis (Kellogg) P.H. Raven
- Browneyes - Camissonia Claviformis (Torr. & Frém.) P.H. Raven ssp. funerea (P.H. Raven) P.H. Raven
- Browneyes - Camissonia Claviformis (Torr. & Frém.) P.H. Raven ssp. integrior (P.H. Raven) P.H. Rave
- Browneyes - Camissonia Claviformis (Torr. & Frém.) P.H. Raven ssp. rubescens (P.H. Raven) P.H. Rave
- Brownfoot - Acourtia Wrightii (A. Gray) Reveal & R.M. King
- Brownfruit Rush - Juncus Pelocarpus E. Mey.
- Brownhair Lacefern - Ctenitis Submarginalis (Langsd. & Fisch.) Ching
- Brownhair Snoutbean - Rhynchosia Cinerea Nash
- Brownhead Rush - Juncus Phaeocephalus Engelm.
- Brownhead Rush - Juncus Phaeocephalus Engelm. var. paniculatus Engelm.
- Brownhead Rush - Juncus Phaeocephalus Engelm. var. phaeocephalus
- Brownies - Mimulus Douglasii (Benth.) A. Gray
- Brownish Beaksedge - Rhynchospora Capitellata (Michx.) Vahl
- Brownish Sedge - Carex Brunnescens (Pers.) Poir.
- Brownish Sedge - Carex Brunnescens (Pers.) Poir. ssp. brunnescens
- Brownish Sedge - Carex Brunnescens (Pers.) Poir. ssp. sphaerostachya (Tuck.) Kalela
- Brownmargin Buckwheat - Eriogonum Ovalifolium Nutt. var. eximium (Tidestr.) J.T. Howell
- Brownplume Wirelettuce - Stephanomeria Pauciflora (Torr.) A. Nelson
- Brownray Knapweed - Centaurea Jacea L.
- Brownseed Paspalum - Paspalum Plicatulum Michx.
- Brownspine Hedgehog Cactus - Echinocereus Russanthus D. Weniger
- Brownspined Pricklypear - Cylindropuntia Californica (Torr. & A. Gray) F.M. Knuth var. parkeri (J.M. Coult.) J. Rebma
- Brownstem Spleenwort - Asplenium Laetum Sw.
- Browntop - Microstegium Nees
- Browntop Millet - Urochloa Ramosa (L.) Nguyen
- Browntop Signalgrass - Urochloa Fusca (Sw.) B.F. Hansen & Wunderlin
- Brownturbans - Malperia Tenuis S. Watson
- Browse Milkvetch - Astragalus Cibarius Sheldon
- Brucea - Brucea J.f. Mill.
- Bruchia Donnellii Austin
- Bruchia Longicollis D.C. Eaton
- Bruchia Moss - Bruchia Flexuosa (Sw. ex Schwägr.) Müll. Hal.
- Bruchia Moss - Bruchia Fusca E. Britton
- Bruchia Moss - Bruchia Schwägr.
- Bruchia Moss - Bruchia Vogesiaca Nestl. ex Schwägr.
- Bruchia Sullivantii Austin
- Brugmansia Arborea auct. non (L.) Steud.
- Brugmansia - Brugmansia Pers.
- Brugmansia Candida Pers., database artifact
- Bruguiera - Bruguiera Savigny
- Bruguiera Gymnorhiza auct. non (L.) Savigny
- Bruguiera Gymnorrhiza (L.) Savigny, orth. var.
- Bruguiera Gymnorrhiza auct. non (L.) Savigny, orth. var.
- Bruised Lichen - Toninia A. Massal.
- Bruised Lichen - Toninia Alutacea (Anzi) Jatta
- Bruised Lichen - Toninia Bullata (G. Mey. & Flotow) Zahlbr.
- Bruised Lichen - Toninia Candida (Weber) Th. Fr.
- Bruised Lichen - Toninia Cinereovirens (Schaerer) A. Massal.
- Bruised Lichen - Toninia Massata (Tuck.) Herre
- Bruised Lichen - Toninia Ruginosa (Tuck.) Herre
- Bruised Lichen - Toninia Tristis (Th. Fr.) Th. Fr.
- Bruneau Mariposa Lily - Calochortus Bruneaunis A. Nelson & J.F. Macbr.
- Bruneau Milkvetch - Astragalus Camptopus Barneby
- Brunellia - Brunellia Ruiz & Pav.
- Brunfelsia - Brunfelsia Chiricaspi Plowman
- Brunfelsia Hopeana (Hook.) Benth.
- Brunfelsia Pauciflora (Cham. & Schltdl.) Benth.
- Brunfelsia Pauciflora (Cham. & Schltdl.) Benth. var. calycina (Benth.) J.A. Schmidt
- Brunfelsia Undulata auct. non Sw.
- Bruniera Columbiana (Karst.) Nieuwl.
- Bruniera Punctata (Griseb.) Nieuwl.
- Brunnera - Brunnera C. Steven
- Brunnichia Cirrhosa Gaertn.
- Brunsfeld's Desertparsley - Lomatium Brunsfeldianum Kemper & R.P. McNeill
- Brunswickgrass - Paspalum Nicorae Parodi
- Brush Cherry - Syzygium Paniculatum Gaertn.
- Brush Noseburn - Tragia Glanduligera Pax & K. Hoffm.
- Brushholly - Xylosma Flexuosa (Kunth) Hemsl.
- Brushland Shrubverbena - Lantana Achyranthifolia Desf.
- Brushpea - Genistidium Dumosum I.M. Johnst.
- Brushpea - Genistidium I.m. Johnst.
- Brushy Mountain St. Johnswort - Hypericum Radfordiorum Weakley ex J.R. Allison
- Brussels Sprouts - Brassica Oleracea L. var. gemmifera DC.
- Bryan's Flatsedge - Cyperus Pennatiformis Kük. var. bryanii Kük.
- Bryant's Beardtongue - Penstemon Bryantiae D.D. Keck
- Bryce Canyon Indian Paintbrush - Castilleja Revealii N.H. Holmgren
- Bryhnia Bolanderi (Lesq.) Broth.
- Bryhnia Brittoniae (Grout) H. Rob.
- Bryhnia Graminicolor (Brid.) Grout var. holzingeri (Renauld & Cardot) Grout
- Bryhnia Moss - Bryhnia Graminicolor (Brid.) Grout
- Bryhnia Moss - Bryhnia Kaur.
- Bryhnia Novae-angliae (Sull. & Lesq.) Grout var. fontinalis Grout
- Bryhnia Oregana (Sull.) H. Rob.
- Bryhnia Stokesii (Turner) H. Rob.
- Bryoandersonia Moss - Bryoandersonia H. Rob.
- Bryoandersonia Moss - Bryoandersonia Illecebra (Hedw.) H. Rob.
- Bryobrittonia Moss - Bryobrittonia Longipes (R.S. Williams) Horton
- Bryobrittonia Moss - Bryobrittonia R.s. Williams
- Bryobrittonia Pellucida R.S. Williams
- Bryocaulon Lichen - Bryocaulon Divergens (Ach.) Karnefelt
- Bryocaulon Lichen - Bryocaulon Karnefelt
- Bryocaulon Lichen - Bryocaulon Pseudosatoanum (Asah.) Karnefelt
- Bryocles Ventricosa Salisb.
- Bryocrumia Andersonii (E.B. Bartram) L.E. Anderson
- Bryocrumia Moss - Bryocrumia L.e. Anderson
- Bryocrumia Moss - Bryocrumia Vivicolor (Dix.) W.R. Buck
- Bryoerythrophyllum Alpigenum (Vent.) Chen
- Bryoerythrophyllum Moss - Bryoerythrophyllum Chen
- Bryoerythrophyllum Moss - Bryoerythrophyllum Ferruginascens (Stirt.) Giac.
- Bryoerythrophyllum Moss - Bryoerythrophyllum Recurvirostre (Hedw.) Chen
- Bryoerythrophyllum Recurvifolium (Taylor) R.H. Zander
- Bryoerythrophyllum Recurvirostre (Hedw.) Chen var. dentatum (Schimp.) H.A. Crum, Steere & L.E. An
- Bryohaplocladium Moss - Bryohaplocladium Angustifolium (Hampe & Müll. Hal.) R. Watan. & Z. Iwats.
- Bryohaplocladium Moss - Bryohaplocladium Microphyllum (Hedw.) R. Watan. & Z. Iwats.
- Bryohaplocladium Moss - Bryohaplocladium R. Watan. & Z. Iwats.
- Bryohaplocladium Praelongum (Schimp. ex Besch.) H.A. Crum
- Bryoid Fissidens Moss - Fissidens Bryoides Hedw.
- Bryolawtonia Vancouveriensis (Kindb.) Enroth & Norris
- Bryonia Cretica L. ssp. dioica (Jacq.) Tutin
- Bryonia Grandis L.
- Bryonora Lichen - Bryonora Castanea (Hepp) Poelt
- Bryonora Lichen - Bryonora Curvescens (Mudd) Poelt
- Bryonora Lichen - Bryonora Poelt
- Bryonora Pruinosa (Th. Fr.) Holt.-Hartw.
- Bryonora Septentrionalis Holt.-Hartw.
- Bryony - Bryonia L.
- Bryophyllum Crenatum Baker
- Bryophyllum Daigremontianum (Raym.-Hamet & H. Perrier) A. Berger
- Bryophyllum Fedtschenkoi (Raym.-Hamet & H. Perrier) Lauz.-March.
- Bryophyllum Pinnatum (Lam.) Oken
- Bryophyllum Tubiflorum Harv.
- Bryopogon Negativus Gyel.
- Bryopogon Pacificus Gyel.
- Bryoria Abbreviata (Müll. Arg.) Brodo & D. Hawksw.
- Bryoria Glabra (Mot.) Brodo & D. Hawksw.
- Bryoria Oregana (Tuck.) Brodo & D. Hawksw.
- Bryoria Subdivergens (E. Dahl) Brodo & D. Hawksw.
- Bryoxiphium Moss - Bryoxiphium Mitt.
- Bryson's Sedge - Carex Brysonii Naczi
- Bryum Acutiforme Limpr.
- Bryum Acutum Lindb.
- Bryum Affine Lindb. & Arnell
- Bryum Affine Lindb. & Arnell var. cirrhatum (Hüb.) Braithw.
- Bryum Alaskanum Kindb.
- Bryum Andicola Hook.
- Bryum Angustirete Kindb.
- Bryum Archangelicum sensu Andrews
- Bryum Argenteum Hedw. var. lanatum (P. Beauv.) Hampe
- Bryum Argenteum Hedw. var. majus Schwägr.
- Bryum Atropurpureum Bruch & Schimp.
- Bryum Atropurpureum Wahlenb.
- Bryum Bicolor Dicks.
- Bryum Biddlecomiae Austin
- Bryum Bimum (Brid.) Turner
- Bryum Capillare Hedw. ssp. erythroloma Kindb.
- Bryum Capillare Hedw. var. flaccidum (Brid.) Bruch & Schimp.
- Bryum Capillare Hedw. var. torquescens (Bruch ex De Not.) Husn.
- Bryum Cernuum (Hedw.) Bruch & Schimp.
- Bryum Cirrhatum Hoppe & Hornsch.
- Bryum Crassirameum Renauld & Cardot
- Bryum Creberrimum Taylor
- Bryum Crispulum Hampe
- Bryum Cruegeri Hampe
- Bryum Cryophilum Martensson
- Bryum Cuspidatum (Bruch & Schimp.) Schimp.
- Bryum Dawsonense R.S. Williams
- Bryum Elegans Nees
- Bryum Fallax Milde
- Bryum Filiforme Dicks.
- Bryum Inclinatum (Brid.) Bland.
- Bryum Intermedium auct. Eur. & Amer.
- Bryum Lacustre (F. Weber & D. Mohr) Bland.
- Bryum Laevifilum Syed
- Bryum Lanatum (P. Beauv.) Brid.
- Bryum Lapponicum sensu Perss.
- Bryum Laurentianum Cardot & Thér.
- Bryum Microerythrocarpum Müll. Hal. & Kindb.
- Bryum Moss - Bryum Aeneum Blytt ex Bruch & Schimp.
- Bryum Moss - Bryum Algovicum Sendtn. ex Müll. Hal.
- Bryum Moss - Bryum Algovicum Sendtn. ex Müll. Hal. var. algovicum
- Bryum Moss - Bryum Algovicum Sendtn. ex Müll. Hal. var. rutheanum (Warnst.) Crundw.
- Bryum Moss - Bryum Amblyodon Müll. Hal.
- Bryum Moss - Bryum Brachyneuron Kindb.
- Bryum Moss - Bryum Calobryoides Spence
- Bryum Moss - Bryum Calophyllum R. Br.
- Bryum Moss - Bryum Capillare Hedw.
- Bryum Moss - Bryum Capillare Hedw. var. barbatum (C.E.O. Jensen) Podp.
- Bryum Moss - Bryum Capillare Hedw. var. capillare
- Bryum Moss - Bryum Coronatum Schwägr.
- Bryum Moss - Bryum Curvatum Kaur. & Arnell
- Bryum Moss - Bryum Cyclophyllum (Schwägr.) Bruch & Schimp.
- Bryum Moss - Bryum Dichotomum Hedw.
- Bryum Moss - Bryum Erythroloma (Kindb.) Syed
- Bryum Moss - Bryum Flaccidum Brid.
- Bryum Moss - Bryum Gemmascens Kindb.
- Bryum Moss - Bryum Gemmilucens Wilcz. & Dem.
- Bryum Moss - Bryum Gemmiparum De Not.
- Bryum Moss - Bryum Hedw.
- Bryum Moss - Bryum Incrassatolimbatum Cardot
- Bryum Moss - Bryum Lisae De Not.
- Bryum Moss - Bryum Lisae De Not. var. cuspidatum (Bruch & Schimp.) Margad.
- Bryum Moss - Bryum Lonchocaulon Müll. Hal.
- Bryum Moss - Bryum Longisetum Bland. ex Schwägr.
- Bryum Moss - Bryum Longisetum Bland. ex Schwägr. var. longisetum
- Bryum Moss - Bryum Meesioides Kindb.
- Bryum Moss - Bryum Microchaeton Hampe
- Bryum Moss - Bryum Nitidulum Lindb.
- Bryum Moss - Bryum Pallens (Brid.) Sw.
- Bryum Moss - Bryum Pallescens Schleich. ex Schwägr.
- Bryum Moss - Bryum Pseudocapillare Besch.
- Bryum Moss - Bryum Purpurascens (R. Br.) Bruch & Schimp.
- Bryum Moss - Bryum Pyriferum Crundw. & H. Whitehouse
- Bryum Moss - Bryum Radiculosum Brid.
- Bryum Moss - Bryum Rubens Mitt.
- Bryum Moss - Bryum Ruderale Crundw. & Nyholm
- Bryum Moss - Bryum Rutilans Brid.
- Bryum Moss - Bryum Salinum I. Hagen ex Limpr.
- Bryum Moss - Bryum Subapiculatum Hampe
- Bryum Moss - Bryum Subneodamense Kindb.
- Bryum Moss - Bryum Tenuisetum Limpr.
- Bryum Moss - Bryum Teres Lindb.
- Bryum Moss - Bryum Turbinatum (Hedw.) Turner
- Bryum Moss - Bryum Uliginosum (Brid.) Bruch & Schimp.
- Bryum Moss - Bryum Violaceum Crundw. & Nyholm
- Bryum Moss - Bryum Warneum (Röhl.) Bland. ex Brid.
- Bryum Neodamense Itzig
- Bryum Neodamense Itzig var. ovatum Lindb. & Arnell
- Bryum Nitens Hook.
- Bryum Obtusifolium Lindb.
- Bryum Oeneum Blytt ex Bruch & Schimp.
- Bryum Ovatum Jur.
- Bryum Pallens (Brid.) Sw. var. fallax Jur.
- Bryum Pendulum (Hornsch.) Schimp.
- Bryum Percurrentinerve Kindb.
- Bryum Pseudostirtonii Philib. ex Cardot & Thér.
- Bryum Pseudotriquetrum (Hedw.) G. Gaertn., B. Mey. & Scherb. var. bimum (Brid.) Lilj.
- Bryum Pseudotriquetrum (Hedw.) G. Gaertn., B. Mey. & Scherb. var. crassirameum (Renauld
- Bryum Roellii Philib.
- Bryum Sandbergii Holz.
- Bryum Sawyeri Renauld & Cardot
- Bryum Speciosum (Hook. f. & Wilson) Mitt.
- Bryum Stenotrichum Müll. Hal.
- Bryum Stenotrichum Müll. Hal. var. biddlecomiae (Austin) E. Lawton
- Bryum Submuticum Philib.
- Bryum Torquescens Bruch ex De Not.
- Bryum Tortifolium Funck
- Bryum Truncorum auct. Amer.
- Btachesked - Calophyllum Inophyllum L. var. wakamatsui (Kaneh.) Fosberg & Sachet
- Buart - Juglans ×bixbyi Rehder
- Bucayo - Erythrina Fusca Lour.
- Bucegia Radian
- Bucegia Romanica Radian
- Bucephalon Racemosum L.
- Buchanania - Buchanania Spreng.
- Buchenavia - Buchenavia Eichl.
- Buchenavia Capitata (Vahl) Eichl.
- Buchloe Dactyloides (Nutt.) Engelm.
- Buchnera Arizonica (A. Gray) Pennell
- Buchnera Breviflora Pennell
- Buchnera Elongata Sw.
- Buchnera Floridana Gandog.
- Buchu - Agathosma Betulina (Bergius) Pill.
- Buchu - Agathosma Crenulata (L.) Pill.
- Bucida - Bucida L.
- Bucida Capitata Vahl
- Bucida Spinosa Jennings
- Buck-horn Cholla - Cylindropuntia Acanthocarpa (Engelm. & J.M. Bigelow) F.M. Knuth
- Buckbean - Menyanthes L.
- Buckbean - Menyanthes Trifoliata L.
- Buckbrush - Ceanothus Cuneatus (Hook.) Nutt.
- Buckbrush - Ceanothus Cuneatus (Hook.) Nutt. var. cuneatus
- Buckeye - Aesculus L.
- Buckeye - Aesculus ×bushii C.K. Schneid. (pro sp.)
- Buckeye - Aesculus ×hybrida DC. (pro sp.)
- Buckeye - Aesculus ×marylandica J.R. Booth ex G. Kirchn.
- Buckeye - Aesculus ×mutabilis (Spach) Scheele
- Buckeye - Aesculus ×neglecta Lindl. (pro sp.)
- Buckeye - Aesculus ×worlitzensis Koehne (pro sp.)
- Buckhorn Cholla - Cylindropuntia Acanthocarpa (Engelm. & J.M. Bigelow) F.M. Knuth var. acanthocarpa
- Buckhorn Cholla - Cylindropuntia Acanthocarpa (Engelm. & J.M. Bigelow) F.M. Knuth var. major (Engelm. & J.M. B
- Buckhorn Plantain - Plantago Coronopus L.
- Buckley's Beardtongue - Penstemon Buckleyi Pennell
- Buckley's Dropseed - Sporobolus Buckleyi Vasey
- Buckley's Fluffgrass - Tridens Buckleyanus (L.H. Dewey) Nash
- Buckley's Goldenrod - Solidago Buckleyi Torr. & A. Gray
- Buckley's Spiderwort - Tradescantia Buckleyi (I.M. Johnst.) D.R. Hunt
- Buckley's St. Johnswort - Hypericum Buckleii M.A. Curtis
- Buckley's Yucca - Yucca Constricta Buckley
- Buckleya - Buckleya Torr.
- Buckroot - Pediomelum Canescens (Michx.) Rydb.
- Buckthorn Bully - Sideroxylon Lycioides L.
- Buckthorn - Frangula Mill.
- Buckthorn - Rhamnus L.
- Buckwheat - Eriogonum Michx.
- Buckwheat - Eriogonum ×blissianum H. Mason
- Buckwheat - Eriogonum ×duchesnense Reveal (pro sp.)
- Buckwheat - Eriogonum ×nebraskense Rydb. (pro sp.)
- Buckwheat - Fagopyrum Esculentum Moench
- Buckwheat - Fagopyrum Mill.
- Buckwheat Milkvetch - Astragalus Caricinus (M.E. Jones) Barneby
- Buckwheat - Stenogonum Nutt.
- Buckwheat Tree - Cliftonia Monophylla (Lam.) Britton ex Sarg.
- Buckwheat Vine - Brunnichia Banks ex Gaertn.
- Bud Sagebrush - Picrothamnus Desertorum Nutt.
- Bud Sagebrush - Picrothamnus Nutt.
- Bud Saxifrage - Saxifraga Bryophora A. Gray
- Bud Saxifrage - Saxifraga Bryophora A. Gray var. bryophora
- Buddleja Racemosa Torr. var. incana Torr.
- Buddlejaleaf Viburnum - Viburnum Buddleifolium C. Wright
- Buek's Groundsel - Packera Subnuda (DC.) D.K. Trock & T.M. Barkley
- Buell Park Phacelia - Phacelia Buell-vivariensis N.D. Atwood
- Buellia Adjuncta Th. Fr.
- Buellia Aethalioides (Nyl.) H. Olivier
- Buellia Alboatra (Hoffm.) Th. Fr.
- Buellia Ambigua (Ach.) Malme
- Buellia Atrata (Sm.) Anzi
- Buellia Badioatra (Flörke ex Spreng.) Körb.
- Buellia Bahiana Malme
- Buellia Blasteniospora Zahlbr.
- Buellia Blumeri Zahlbr.
- Buellia Callispora (C. Knight) J. Steiner
- Buellia Canescens (Dicks.) De Not.
- Buellia Chlorophaea (Hepp ex Leight.) Lettau
- Buellia Colludens (Nyl.) Arnold
- Buellia Coniops (Wahlenb.) Th. Fr.
- Buellia Conspirans (Nyl.) Vain.
- Buellia Contermina Arnold
- Buellia Coracina (Nyl.) Körb.
- Buellia Crystallifera (Vain.) Hav.
- Buellia Dispersa A. Massal.
- Buellia Epipolia (Ach.) Mong.
- Buellia Glaucomarioides Willey ex Tuck.
- Buellia Glauziouana (Krempelh.) Müll. Arg.
- Buellia Hassei Imshaug
- Buellia Imshaugiana R.C. Harris
- Buellia Inquilina Tuck.
- Buellia Leucomela Imshaug
- Buellia Malmei Lynge
- Buellia Moriopsis (A. Massal.) Th. Fr.
- Buellia Myriocarpa (DC.) De Not.
- Buellia Nivalis (Bagl. & Carestia) Hertel
- Buellia Parasema (Ach.) De Not.
- Buellia Penichra (Tuck.) Hasse
- Buellia Pertusariicola Willey ex Tuck.
- Buellia Polyspora (Willey) Vain.
- Buellia Pruinella Imshaug
- Buellia Pueblae de Lesd.
- Buellia Pulchella (Schrad.) Tuck.
- Buellia Pullata Tuck.
- Buellia Punctata (Hoffm.) A. Massal.
- Buellia Punctata (Hoffm.) A. Massal. var. polyspora (Willey) Fink
- Buellia Radiata Tuck.
- Buellia Rappii Imshaug ex R.C. Harris
- Buellia Rinodinospora Riddle
- Buellia Scabrosa (Ach.) A. Massal.
- Buellia Tergestina J. Steiner & Zahlbr.
- Buellia Thomae (Tuck.) Imshaug
- Buellia Tucsonensis Zahlbr.
- Buellia Turgescentoides Fink
- Buellia Venusta (Körb.) Lettau
- Buellia Verruculosa (Sm.) Mudd
- Buellia Verruculosa auct.
- Buellia Wahlenbergii (Ach.) Sheard
- Buellia Zahlbruckneri J. Steiner
- Buelliella Inquilina (Tuck.) Fink
- Buelliella Lichen - Buelliella Fink
- Buelliella Lichen - Buelliella Minimula (Tuck.) Fink
- Buelliella Nuttallii (Calk. & Nyl.) Fink
- Buelliella Parmeliarum (Sommerf.) Fink
- Buelliella Physciicola Poelt & Hafellner
- Buelliella Saxatilis (Schaerer) Fink
- Buelliopsis Papillata (Sommerf.) Fink
- Buelliopsis Vernicoma (Tuck.) A. Schneid.
- Buff Fleabane - Erigeron Ochroleucus Nutt.
- Buffalo Clover - Trifolium Reflexum L.
- Buffalo Hawthorn - Crataegus Xanthophylla Sarg.
- Buffalo Nut - Pyrularia Pubera Michx.
- Buffalo-spinach - Enydra Fluctuans Lour.
- Buffaloberry - Shepherdia Nutt.
- Buffalobur Nightshade - Solanum Rostratum Dunal
- Buffalograss - Bouteloua Dactyloides (Nutt.) J.T. Columbus
- Buffelgrass - Pennisetum Ciliare (L.) Link
- Buffpetal - Rhynchosida Physocalyx (A. Gray) Fryxell
- Bugbane - Trautvetteria Fisch. & C.A. Mey.
- Bugheal - Trichocoronis A. Gray
- Bugle - Ajuga L.
- Bugle Hedgenettle - Stachys Ajugoides Benth.
- Bugle-lily - Watsonia Mill.
- Bugloss - Anchusa L.
- Buglossoides - Buglossoides Moench
- Buglossum Barrelieri All.
- Bugseed - Corispermum Hyssopifolium L.
- Bugseed - Corispermum L.
- Bukhara Fleeceflower - Polygonum Baldschuanicum Regel
- Bukitang - Taeniophyllum Palawense Schltr.
- Bukitang - Taeniophyllum Petrophilum Schltr.
- Buko - Gnetum Gnemon L.
- Bulangan - Gmelina Elliptica Sm.
- Bulb Panicgrass - Panicum Bulbosum Kunth
- Bulbil Bugle-lily - Watsonia Meriana (L.) Mill.
- Bulbil Onion - Allium Geyeri S. Watson var. tenerum M.E. Jones
- Bulbilis Dactyloides (Nutt.) Raf. ex Kuntze
- Bulbine Semibarbata (R. Br.) Haw.
- Bulbine Wolf
- Bulblet Bladderfern - Cystopteris Bulbifera (L.) Bernh.
- Bulblet-bearing Water Hemlock - Cicuta Bulbifera L.
- Bulbocastanum Linnaei Schur
- Bulbocodium Serotinum L.
- Bulbophyllum - Bulbophyllum Thouars
- Bulbophyllum Desmanthum Tuyama
- Bulbostylis Annua Nutt.
- Bulbostylis Californica Torr. & A. Gray
- Bulbostylis Capillaris (L.) Kunth ex C.B. Clarke ssp. antillana (Britton) T. Koyama
- Bulbostylis Capillaris (L.) Kunth ex C.B. Clarke ssp. insulana M.T. Strong
- Bulbostylis Capillaris (L.) Kunth ex C.B. Clarke var. crebra Fernald
- Bulbostylis Capillaris (L.) Kunth ex C.B. Clarke var. isopoda Fernald
- Bulbostylis Coarctata (Elliott) Fernald
- Bulbostylis Fendleri C.B. Clarke
- Bulbostylis Junciformis auct. non (Kunth) C.B. Clarke
- Bulbostylis Juncoides (Vahl) Kük. var. ampliceps Kük.
- Bulbostylis Papillosa Kük.
- Bulbostylis Subaphylla C.B. Clarke
- Bulbothrix Lichen - Bulbothrix Hale
- Bulbothrix Lichen - Bulbothrix Isidiza (Nyl.) Hale
- Bulbothrix Lichen - Bulbothrix Laevigatula (Nyl.) Hale
- Bulbous Adderstongue - Ophioglossum Crotalophoroides Walter
- Bulbous Adderstongue - Ophioglossum Crotalophoroides Walter var. crotalophoroides
- Bulbous Adderstongue - Ophioglossum Crotalophoroides Walter var. nanum Osten ex J.S. Licht.
- Bulbous Airplant - Tillandsia Bulbosa Hook.
- Bulbous Barley - Hordeum Bulbosum L.
- Bulbous Bittercress - Cardamine Bulbosa (Schreb. ex Muhl.) Britton, Sterns & Poggenb.
- Bulbous Bluegrass - Poa Bulbosa L.
- Bulbous Canarygrass - Phalaris Aquatica L.
- Bulbous Rush - Juncus Bulbosus L.
- Bulbous Springparsley - Cymopterus Bulbosus A. Nelson
- Bulbous Woodland-star - Lithophragma Glabrum Nutt.
- Bulbous Woodrush - Luzula Bulbosa (Alph. Wood) Smyth & Smyth
- Bulbous Yam - Dioscorea Pilosiuscula Bertero ex Spreng.
- Bull Clover - Trifolium Fucatum Lindl.
- Bull Cottonthistle - Onopordum Tauricum Willd.
- Bull Crowngrass - Paspalum Boscianum Flueggé
- Bull Horn Acacia - Vachellia Collinsii (Saff.) Seigler & Ebinger
- Bull Mallee - Eucalyptus Behriana F. Muell.
- Bull Mallow - Malva Nicaeensis All.
- Bull Mountain Buckwheat - Eriogonum Cronquistii Reveal
- Bull Thistle - Cirsium Vulgare (Savi) Ten.
- Bull Withe - Heteropterys Purpurea (L.) Kunth
- Bull's Coraldrops - Besseya Bullii (Eaton) Rydb.
- Bull's Eye - Euryops Chrysanthemoides (DC.) B. Nord.
- Bull-oak - Allocasuarina Luehmannii (R.T. Baker) L.A.S. Johnson
- Bullatina Lichen - Bullatina Aspidota (Vain.) Vezda & Poelt
- Bullatina Lichen - Bullatina Vezda & Poelt
- Bulletwood - Manilkara Bidentata (A. DC.) A. Chev
- Bullfrog Mountain Pea - Lathyrus Hitchcockianus Barneby & Reveal
- Bullgrass - Muhlenbergia Emersleyi Vasey
- Bullhorn Wattle - Vachellia Cornigera (L.) Seigler & Ebinger
- Bulliarda Aquatica (L.) DC.
- Bullich - Eucalyptus Megacarpa F. Muell.
- Bullseye Lichen - Placopsis (nyl.) Lindsay
- Bullseye Lichen - Placopsis Cribellans (Nyl.) Rasanen
- Bullseye Lichen - Placopsis Gelida (L.) Lindsay
- Bullsuckers - Opuntia ×cubensis Britton & Rose
- Bulltongue Arrowhead - Sagittaria Lancifolia L.
- Bulltongue Arrowhead - Sagittaria Lancifolia L. ssp. lancifolia
- Bulltongue Arrowhead - Sagittaria Lancifolia L. ssp. media (Micheli) Bogin
- Bullwood - Sloanea Berteriana Choisy ex DC.
- Bullwood - Sloanea L.
- Bully - Sideroxylon L.
- Bullytree - Pouteria Multiflora (A. DC.) Eyma
- Bulrush - Blysmus Panzer ex Schult.
- Bulrush - Bolboschoenus (asch.) Palla
- Bulrush - Isolepis R. Br.
- Bulrush - Oxycaryum Nees
- Bulrush - Schoenoplectiella Lye
- Bulrush - Schoenoplectus (rchb.) Palla
- Bulrush - Schoenoplectus Subulatus (Vahl) Lye
- Bulrush - Schoenoplectus ×carinatus (Sm.) Palla
- Bulrush - Schoenoplectus ×contortus (Eames) S.G. Sm.
- Bulrush - Schoenoplectus ×oblongus (T. Koyama) Soják
- Bulrush - Schoenoplectus ×steinmetzii (Fernald) S.G. Sm.
- Bulrush - Scirpoides Ség.
- Bulrush - Scirpus L.
- Bulrush - Scirpus ×peckii Britton (pro sp.)
- Bulrush - Trichophorum Pers.
- Bumelia Americana (Mill.) Stearn
- Bumelia Angustifolia Nutt.
- Bumelia Anomala (Sarg.) R.B. Clark
- Bumelia Bellonis (Urb.) Stearn
- Bumelia Cassinifolia Small
- Bumelia Celastrina Kunth
- Bumelia Celastrina Kunth var. angustifolia (Nutt.) R.W. Long
- Bumelia Cubensis Griseb.
- Bumelia Krugii Pierre
- Bumelia Lacuum Small
- Bumelia Lanuginosa (Michx.) Pers.
- Bumelia Lanuginosa (Michx.) Pers. ssp. oblongifolia (Nutt.) Cronquist
- Bumelia Lanuginosa (Michx.) Pers. ssp. rigida (A. Gray) Cronquist
- Bumelia Lanuginosa (Michx.) Pers. var. albicans Sarg.
- Bumelia Lanuginosa (Michx.) Pers. var. oblongifolia (Nutt.) R.B. Clark
- Bumelia Lanuginosa (Michx.) Pers. var. rigida A. Gray
- Bumelia Lanuginosa (Michx.) Pers. var. texana (Buckley) Cronquist
- Bumelia Lycioides (L.) Pers.
- Bumelia Lycioides (L.) Pers. var. ellipsoidalis R.B. Clark
- Bumelia Lycioides (L.) Pers. var. virginiana Fernald
- Bumelia Megacocca Small
- Bumelia Microcarpa Small
- Bumelia Monticola Buckley
- Bumelia Navassana Urb. & Ekman
- Bumelia Oblongifolia Nutt.
- Bumelia Obovata (Lam.) A. DC.
- Bumelia Obovata (Lam.) A. DC. var. krugii (Pierre) Cronquist
- Bumelia Reclinata (Michx.) Vent.
- Bumelia Reclinata (Michx.) Vent. var. austrofloridensis Whetstone
- Bumelia Reclinata (Michx.) Vent. var. rufotomentosa (Small) Cronquist
- Bumelia Rigida (A. Gray) Small
- Bumelia Rufa Raf.
- Bumelia Rufotomentosa Small
- Bumelia Salicifolia (L.) Sw.
- Bumelia Smallii R.B. Clark
- Bumelia Tenax (L.) Willd.
- Bumelia Texana Buckley
- Bumelia Thornei Cronquist
- Bumpy Jointtail Grass - Coelorachis Tuberculosa (Nash) Nash
- Bunch Cutgrass - Leersia Monandra Sw.
- Bunch Kerosene Grass - Aristida Contorta F. Muell.
- Bunchberry Dogwood - Cornus Canadensis L.
- Bunched Arrowhead - Sagittaria Fasciculata E.O. Beal
- Bunched Beaksedge - Rhynchospora Cephalantha A. Gray
- Bunchleaf Penstemon - Penstemon Heterophyllus Lindl.
- Bunchleaf Penstemon - Penstemon Heterophyllus Lindl. ssp. heterophyllus
- Bunchosia Nitida auct. non (Jacq.) DC.
- Bundleflower - Desmanthus Willd.
- Bungaruau - Schefflera Elliptica (Blume) Harms
- Bunge's Hackberry - Celtis Bungeana Blume
- Bunge's Pine - Pinus Bungeana Zucc. ex Endl.
- Bunge's Smartweed - Polygonum Bungeanum Turcz.
- Bunias Edentula Bigelow
- Bunodophoron A. Massal.
- Bunodophoron Melanocarpum (Sw.) Wedin
- Bunya Bunya - Araucaria Bidwillii Hook.
- Buphthalmum Arborescens L.
- Bupleurum - Bupleurum L.
- Bupleurum Fontanesii Guss. ex Caruel
- Bupleurum Protractum Hoffm. & Link
- Bupleurum Ranunculoides L.
- Bupleurum Subovatum Link ex Spreng.
- Bupleurum Triradiatum J.E. Adams ex Hoffm. ssp. arcticum (Regel) Hultén
- Bupleurum-leaved Alysicarpus - Alysicarpus Bupleurifolius (L.) DC.
- Bur Bristlegrass - Setaria Adhaerens (Forssk.) Chiov.
- Bur Chervil - Anthriscus Caucalis M. Bieb.
- Bur Cucumber - Sicyos L.
- Bur Grass - Tragus Haller
- Bur Mallow - Urena Sinuata L.
- Bur Oak - Quercus Macrocarpa Michx.
- Bur Oak - Quercus Macrocarpa Michx. var. depressa (Nutt.) Engelm.
- Bur Oak - Quercus Macrocarpa Michx. var. macrocarpa
- Bur Parsley - Caucalis L.
- Bur Pincushionplant - Navarretia Prolifera Greene
- Bur Pincushionplant - Navarretia Prolifera Greene ssp. prolifera
- Bur-reed Sedge - Carex Sparganioides Muhl. ex Willd.
- Bur-reed - Sparganium L.
- Burahol - Stelechocarpus Burahol (Blume) Hook. f. & Thomson
- Burbark - Triumfetta L.
- Burchell's Clover - Trifolium Burchellianum Ser.
- Burclover - Medicago Polymorpha L.
- Burdock - Arctium L.
- Burdock Clover - Trifolium Lappaceum L.
- Burgan - Kunzea Ericoides (A. Rich.) J. Thomp.
- Burgess' Broomsage - Lepidospartum Burgessii B.L. Turner
- Burgess' Skin Lichen - Leptogium Burgessii (L.) Mont.
- Burhead - Echinodorus Rich. ex Engelm.
- Burk's Smooth Rockcress - Arabis Laevigata (Muhl. ex Willd.) Poir. var. burkii Porter
- Burke's Baeria - Lasthenia Burkei (Greene) Greene
- Burlew's Onion - Allium Burlewii Davidson
- Burma Padauk - Pterocarpus Macrocarpus Kurz
- Burmann's Basketgrass - Oplismenus Burmannii (Retz.) P. Beauv.
- Burmese Fishtail Palm - Caryota Mitis Lour.
- Burmese Lacquer - Melanorrhoea Usitata Wall.
- Burn Nose - Daphnopsis Americana (Mill.) J.R. Johnst.
- Burnet Oak - Quercus ×burnetensis Little
- Burnet Ragwort - Packera Sanguisorboides (Rydb.) W.A. Weber & Á. Löve
- Burnet - Sanguisorba L.
- Burnet Saxifrage - Pimpinella L.
- Burnet's Skin Lichen - Leptogium Burnetiae C.W. Dodge
- Burnham's Blackberry - Rubus Burnhamii L.H. Bailey
- Burningbush - Bassia Scoparia (L.) A.J. Scott
- Burningbush - Euonymus Alatus (Thunb.) Siebold
- Burningbush - Euonymus Alatus (Thunb.) Siebold var. alatus
- Burningbush - Euonymus Atropurpureus Jacq.
- Burnweed - Erechtites Raf.
- Burr Daisytree - Fitchia Speciosa Cheeseman
- Burr Sedge - Lagenocarpus Guianensis Lindl. & Nees
- Burrawong - Macrozamia Communis L.A.S. Johnson
- Burrdock - Arctium ×mixtum Nyman
- Burrdock - Arctium ×nothum (Ruhmer) J. Weiss
- Burridge's Greenthread - Thelesperma Burridgeanum (Regel, Korn. & Rach.) S.F. Blake
- Burro Blanco - Capparis Amplissima Lam.
- Burrobrush - Hymenoclea Salsola Torr. & A. Gray
- Burrobrush - Hymenoclea Salsola Torr. & A. Gray var. fasciculata (A. Nelson) K.M. Peterson & Pay
- Burrobrush - Hymenoclea Salsola Torr. & A. Gray var. pentalepis (Rydb.) L.D. Benson
- Burrobrush - Hymenoclea Salsola Torr. & A. Gray var. salsola
- Burrobrush - Hymenoclea Torr. & A. Gray ex A. Gray
- Burrobush - Ambrosia Dumosa (A. Gray) Payne
- Burrograss - Scleropogon Brevifolius Phil.
- Burrograss - Scleropogon Phil.
- Burroweed - Isocoma Tenuisecta Greene
- Burrowing Four O'clock - Okenia Hypogaea Schltdl. & Cham.
- Burrweed - Gymnostyles Juss.
- Burrweed - Soliva Ruiz & Pav.
- Bursa Bursa-pastoris (L.) Britton
- Bursa Bursa-pastoris (L.) Britton var. bifida Crép.
- Bursa Gracilis Gren.
- Bursera - Bursera Jacq. ex L.
- Bursera Odorata auct. non Brandegee
- Burshia Humilis Raf.
- Bursting-heart - Euonymus Americanus L.
- Buryseed Umbrellagrass - Enteropogon Chlorideus (J. Presl) W.D. Clayton
- Bush Allamanda - Allamanda Schottii Pohl
- Bush Arrowleaf - Pleurocoronis Pluriseta (A. Gray) R.M. King & H. Rob.
- Bush Beardtongue - Keckiella Breviflora (Lindl.) Straw
- Bush Beardtongue - Keckiella Breviflora (Lindl.) Straw ssp. breviflora
- Bush Beardtongue - Keckiella Breviflora (Lindl.) Straw ssp. glabrisepala (D.D. Keck) Straw
- Bush Chinquapin - Chrysolepis Sempervirens (Kellogg) Hjelmqvist
- Bush Clockvine - Thunbergia Erecta (Benth.) T. Anderson
- Bush Croton - Croton Fruticulosus Engelm. ex Torr.
- Bush Honeysuckle - Diervilla Mill.
- Bush Monkeyflower - Diplacus Nutt.
- Bush Morning-glory - Ipomoea Leptophylla Torr.
- Bush Muhly - Muhlenbergia Porteri Scribn. ex Beal
- Bush Nightfighter - Dracaena Steudneri Schweinf. ex Engl.
- Bush Oak - Quercus ×bushii Sarg.
- Bush Pea - Lathyrus Brachycalyx Rydb. ssp. zionis (C.L. Hitchc.) S.L. Welsh
- Bush Penstemon - Penstemon Fruticosus (Pursh) Greene
- Bush Penstemon - Penstemon Fruticosus (Pursh) Greene var. fruticosus
- Bush Rue - Cneoridium Dumosum (Nutt.) Hook. f. ex Baill.
- Bush Vetch - Vicia Sepium L.
- Bush Vetch - Vicia Sepium L. var. montana W.D.J. Koch
- Bush Vetch - Vicia Sepium L. var. sepium
- Bush Vetchling - Lathyrus Eucosmus Butters & H. St. John
- Bush Yam - Dioscorea Praehensilis Benth.
- Bush's Blackberry - Rubus Bushii L.H. Bailey
- Bush's Fissidens Moss - Fissidens Bushii (Cardot & Thér.) Cardot & Thér.
- Bush's Goosefoot - Chenopodium Berlandieri Moq. var. bushianum (Aellen) Cronquist
- Bush's Poppymallow - Callirhoe Bushii Fernald
- Bush's Purple Coneflower - Echinacea Paradoxa (J.B.S. Norton) Britton
- Bush's Purple Coneflower - Echinacea Paradoxa (J.B.S. Norton) Britton var. neglecta R.L. McGregor
- Bush's Purple Coneflower - Echinacea Paradoxa (J.B.S. Norton) Britton var. paradoxa
- Bush's Sedge - Carex Bushii Mack.
- Bush's Skullcap - Scutellaria Bushii Britton
- Bush's Umbrella-sedge - Fuirena Bushii Kral
- Bush-violet - Browallia Eludens R.K. Van Devender & P.D. Jenkins
- Bushbean - Macroptilium (benth.) Urb.
- Bushclover Dodder - Cuscuta Pentagona Engelm. var. glabrior (Engelm.) Gandhi, R.D. Thomas & S.L. Hatch
- Bushclover Dodder - Cuscuta Pentagona Engelm. var. pubescens (Engelm.) Yunck.
- Bushkiller - Cayratia Japonica (Thunb.) Gagnep.
- Bushloving Cryptantha - Cryptantha Dumetorum (Greene ex A. Gray) Greene
- Bushmallow - Malacothamnus Greene
- Bushmint - Hyptis Jacq.
- Bushsunflower - Simsia Pers.
- Bushweed - Flueggea Willd.
- Bushy Bedstraw - Galium Matthewsii A. Gray
- Bushy Bird's Beak - Cordylanthus Ramosus Nutt. ex Benth.
- Bushy Blazingstar - Mentzelia Dispersa S. Watson
- Bushy Blazingstar - Mentzelia Dispersa S. Watson var. dispersa
- Bushy Blazingstar - Mentzelia Dispersa S. Watson var. latifolia (Rydb.) J.F. Macbr.
- Bushy Bluestem - Andropogon Glomeratus (Walter) Britton, Sterns & Poggenb.
- Bushy Bluestem - Andropogon Glomeratus (Walter) Britton, Sterns & Poggenb. var. glomeratus
- Bushy Bluestem - Andropogon Glomeratus (Walter) Britton, Sterns & Poggenb. var. hirsutior (Hack.) C. Mo
- Bushy Bluestem - Andropogon Glomeratus (Walter) Britton, Sterns & Poggenb. var. pumilus Vasey ex L.H. D
- Bushy Buckwheat - Eriogonum Suffruticosum S. Watson
- Bushy Cryptantha - Cryptantha Racemosa (S. Watson) Greene
- Bushy Frostweed - Helianthemum Dumosum (E.P. Bicknell) Fernald
- Bushy Goldentop - Euthamia Leptocephala (Torr. & A. Gray) Greene ex Porter & Britton
- Bushy Heliotrope - Heliotropium Ternatum Vahl
- Bushy Knotweed - Polygonum Ramosissimum Michx.
- Bushy Knotweed - Polygonum Ramosissimum Michx. var. prolificum Small
- Bushy Knotweed - Polygonum Ramosissimum Michx. var. ramosissimum
- Bushy Lippia - Lippia Alba (Mill.) N.E. Br. ex Britton & P. Wilson
- Bushy Seaside Tansy - Borrichia Frutescens (L.) DC.
- Bushy Spikemoss - Selaginella Bigelovii Underw.
- Bushy St. Johnswort - Hypericum Densiflorum Pursh
- Bushy Yate - Eucalyptus Lehmannii (Schauer) Benth.
- Butea - Butea Roxb. ex Willd.
- Butler's Sandparsley - Ammoselinum Butleri (Engelm. ex S. Watson) J.M. Coult. & Rose
- Butomus - Butomus L.
- Butte County Checkerbloom - Sidalcea Robusta A. Heller ex Roush
- Butte County Fritillary - Fritillaria Eastwoodiae Macfarlane
- Butte County Western Rosinweed - Calycadenia Oppositifolia (Greene) Greene
- Butte Desertparsley - Lomatium Marginatum (Benth.) J.M. Coult. & Rose
- Butte Desertparsley - Lomatium Marginatum (Benth.) J.M. Coult. & Rose var. marginatum
- Butte Desertparsley - Lomatium Marginatum (Benth.) J.M. Coult. & Rose var. purpureum Jeps.
- Buttecandle - Cryptantha Celosioides (Eastw.) Payson
- Butter And Eggs - Linaria Vulgaris Mill.
- Butter Tree - Pentadesma Butyracea Sabine
- Butterbough - Exothea Paniculata (Juss.) Radlk.
- Butterbur - Petasites Mill.
- Buttercup - Ranunculus L.
- Buttercup Suksdorfia - Suksdorfia Ranunculifolia (Hook.) Engl.
- Butterfly Mariposa Lily - Calochortus Venustus Douglas ex Benth.
- Butterfly Milkweed - Asclepias Tuberosa L.
- Butterfly Milkweed - Asclepias Tuberosa L. ssp. interior Woodson
- Butterfly Milkweed - Asclepias Tuberosa L. ssp. tuberosa
- Butterfly Orchid - Encyclia Hook.
- Butterfly Orchid - Psychopsis Papilio (Lindl.) H.G. Jones
- Butterfly Orchid - Psychopsis Raf.
- Butterfly Palm - Dypsis Noronha ex Mart.
- Butterfly Pea - Centrosema (dc.) Benth.
- Butterfly Tree - Bauhinia Purpurea L.
- Butterfly Violet - Viola Psychodes Greene
- Butterflybush - Buddleja L.
- Butternut - Juglans Cinerea L.
- Butterweed - Packera Glabella (Poir.) C. Jeffrey
- Butterweed - Sinosenecio B. Nord.
- Butterwick's Starviolet - Stenaria Butterwickiae (Terrell) Terrell
- Butterwort - Pinguicula L.
- Butterworth's Buckwheat - Eriogonum Butterworthianum J.T. Howell
- Button Brittlebush - Encelia Frutescens (A. Gray) A. Gray
- Button Brittlebush - Encelia Resinifera C. Clark ssp. resinifera
- Button Burrweed - Gymnostyles Anthemifolia Juss.
- Button Eryngo - Eryngium Yuccifolium Michx.
- Button Eryngo - Eryngium Yuccifolium Michx. var. synchaetum A. Gray ex J.M. Coult. & Rose
- Button Eryngo - Eryngium Yuccifolium Michx. var. yuccifolium
- Button Fern - Tectaria Cicutaria (L.) Copeland
- Button Mangrove - Conocarpus Erectus L.
- Button Sedge - Carex Bullata Schkuhr ex Willd.
- Buttonbush - Cephalanthus L.
- Buttonbush Dodder - Cuscuta Cephalanthi Engelm.
- Buttonbush Flatsedge - Cyperus Cephalanthus Torr. & Hook.
- Buttongrass - Dactyloctenium Radulans (R. Br.) P. Beauv.
- Buttonia - Buttonia Mcken ex Benth.
- Buttonia Hildebrandtii Engl.
- Buttonsage - Lantana Involucrata L.
- Buttonsage - Lantana Involucrata L. var. involucrata
- Buttonweed - Diodia L.
- Butyrospermum Paradoxum (C.F. Gaertn.) Hepper ssp. parkii (G. Don) Hepper
- Butyrospermum Parkii (G. Don) Kotschy
- Buxbaum's Sedge - Carex Buxbaumii Wahlenb.
- Buxbaumia Indusiata Brid.
- Buxbaumia Moss - Buxbaumia Aphylla Hedw.
- Buxbaumia Moss - Buxbaumia Hedw.
- Buxbaumia Moss - Buxbaumia Minakatae Okam.
- Buxbaumia Moss - Buxbaumia Viridis (DC.) Moug. & Nestl.
- Buxbaumia Subcylindrica Grout
- Buxella Brachycera (Michx.) Small
- Buxus Balearica Lam.
- Buxus Chinensis Link
- Buxus Citrifolia (Willd.) Spreng.
- Buxus Harlandii Hance
- Buxus Laevigata (Sw.) Spreng. [excluded]
- Buzzy Lizzy - Impatiens Walleriana Hook. f.
- Byron Larkspur - Delphinium Recurvatum Greene
- Byrsonima - Byrsonima Rich. ex Kunth
- Byrsonima Coriacea (Sw.) DC.
- Byrsonima Cuneata (Turcz.) P. Wilson
- Byrsonima Horneana Britton & Small
- Byrsonima Ophiticola Small ex Britton
- Byssoloma Lichen - Byssoloma Leucoblepharum (Nyl.) Vain.
- Byssoloma Lichen - Byssoloma Subdiscordans (Nyl.) P. James
- Byssoloma Lichen - Byssoloma Trevis.
- Byssoloma Lichen - Byssoloma Tricholomum (Mont.) Zahlbr.
- Byssoloma Marginatum (Arnold) Serus.
- Byssoloma Meadii (Tuck.) S. Ekman
- Byssoloma Pubescens Vezda ex R.C. Harris
- Byssoloma Rotulifomre (Müll. Arg.) R. Sant.
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