VegeWorx Plant Index - Letter F
- Faba Vulgaris Moench
- Fabiana - Fabiana Ruiz & Pav.
- Fabronia Ciliaris (Brid.) Brid. var. bartramii (Grout) Grout
- Fabronia Ciliaris (Brid.) Brid. var. ovata (Grout) Grout
- Fabronia Donnellii Austin
- Fabronia Gymnostoma Sull. & Lesq.
- Fabronia Imperfecta Sharp
- Fabronia Iowensis Cav.
- Fabronia Moss - Fabronia Ciliaris (Brid.) Brid.
- Fabronia Moss - Fabronia Ciliaris (Brid.) Brid. var. ciliaris
- Fabronia Moss - Fabronia Ciliaris (Brid.) Brid. var. polycarpa (Hook.) W.R. Buck
- Fabronia Moss - Fabronia Pusilla Raddi
- Fabronia Moss - Fabronia Raddi
- Fabronia Ravenelii Sull.
- Fabronia Wrightii Sull.
- Fabronia Wrightii Sull. var. intermedia Grout
- Facelis Apiculata Cass.
- Fadyen's Silktassel - Garrya Fadyenia Hook.
- Fagonbush - Fagonia L.
- Fagonia Californica Benth. [excluded]
- Fagonia Californica Benth. ssp. laevis (Standl.) Wiggins
- Fagonia Californica Benth. var. glutinosa Vail
- Fagonia Californica Benth. var. laevis (Standl.) L.D. Benson
- Fagonia Californica Benth. var. longipes (Standl.) L.D. Benson
- Fagonia Longipes Standl.
- Fagopyrum Fagopyrum (L.) Karst., nom. inval.
- Fagopyrum Sagittatum Gilib.
- Fagopyrum Vulgare Hill
- Fagraea Berteriana A. Gray ex Benth. var. galilai (Gilg & Gilg-Ben.) Fosberg, orth.
- Fagraea Berteriana A. Gray ex Benth., orth. var.
- Fagraea Berteroana A. Gray ex Benth.
- Fagraea Thunb.
- Fagus Americana Sweet
- Fagus Ferruginea Aiton
- Fagus Grandifolia Ehrh. ssp. heterophylla Camp
- Fagus Grandifolia Ehrh. var. caroliniana (Loudon) Fernald & Rehder
- Fagus Sylvatica L. var. atropunicea Weston
- Fahkahatchee Bluethread - Burmannia Flava Mart.
- Fairbanks Annual Indian Paintbrush - Castilleja Annua Pennell
- Fairfield Milkvetch - Astragalus Atratus S. Watson var. inseptus Barneby
- Fairy Beaksedge - Rhynchospora Pusilla Chapm. ex M.A. Curtis
- Fairy Bentspur Orchid - Campylocentrum Micranthum (Lindl.) Maury
- Fairy Fans - Clarkia Breweri (A. Gray) Greene
- Fairy Flax - Linum Catharticum L.
- Fairy Orchid - Nidema Ottonis (Rchb. f.) Britton & Millsp.
- Fairy Orchid - Oberonia Lindl.
- Fairy Slipper - Calypso Bulbosa (L.) Oakes
- Fairy Slipper - Calypso Bulbosa (L.) Oakes var. americana (R. Br.) Luer
- Fairy Slipper - Calypso Bulbosa (L.) Oakes var. occidentalis (Holz.) B. Boivin
- Fairy Slipper - Calypso Salisb.
- Fairybells - Prosartes D. Don
- Fairybit Maiden Fern - Thelypteris Abrupta (Desv.) Proctor
- Fairyduster - Calliandra Eriophylla Benth.
- Fairypoppy - Meconella Nutt.
- Fairyswords - Cheilanthes Lindheimeri Hook.
- Fairywand - Chamaelirium Luteum (L.) A. Gray
- Falcaria - Falcaria Fabr.
- Falcaria Sioides (Wibel) Asch.
- Falcata Comosa (L.) Kuntze
- Falcata Pitcheri (Torr. & A. Gray) Kuntze
- Falcate Rush - Juncus Falcatus E. Mey.
- Falcate Rush - Juncus Falcatus E. Mey. ssp. falcatus
- Falfurrias Milkvine - Matelea Radiata Correll
- Fall Buttercup - Ranunculus Aestivalis (L.D. Benson) Van Buren & Harper
- Fall Dandelion - Leontodon Autumnalis L.
- Fall Dandelion - Leontodon Autumnalis L. ssp. autumnalis
- Fall Dandelion - Leontodon Autumnalis L. ssp. pratensis (Link) Arcang.
- Fall Goldenrod - Solidago Simulans Fernald
- Fall Panicgrass - Panicum Dichotomiflorum Michx.
- Fall Panicgrass - Panicum Dichotomiflorum Michx. var. bartowense (Scribn. & Merr.) Fernald
- Fall Panicgrass - Panicum Dichotomiflorum Michx. var. dichotomiflorum
- Fall Panicgrass - Panicum Dichotomiflorum Michx. var. puritanorum Svens.
- Fall Phlox - Phlox Paniculata L.
- Fall Rosette Grass - Dichanthelium Wilcoxianum (Vasey) Freckmann
- Fall Sneezeweed - Helenium Autumnale L. var. grandiflorum (Nutt.) Torr. & A. Gray
- Fall Tansyaster - Machaeranthera Asteroides (Torr.) Greene
- Fall Tansyaster - Machaeranthera Asteroides (Torr.) Greene var. asteroides
- Fall Tansyaster - Machaeranthera Asteroides (Torr.) Greene var. glandulosa B.L. Turner
- Fall Tansyaster - Machaeranthera Asteroides (Torr.) Greene var. lagunensis (D.D. Keck) B.L. Turner
- Fall Witchgrass - Digitaria Cognata (Schult.) Pilg.
- Fallflowering Pleatleaf - Nemastylis Floridana Small
- Falling Dewberry - Rubus Apogaeus L.H. Bailey
- Fallopia Aubertii (Henry) Holub
- Fallopia Baldschuanica (Regel) Holub
- Fallopia Cilinodis (Michx.) Holub
- Fallopia Convolvulus (L.) Á. Löve
- Fallopia Cristata (Engelm. & A. Gray) Holub
- Fallopia Dumetorum (L.) Holub
- Fallopia Japonica (Houtt.) Ronse Decr.
- Fallopia Sachalinensis (F. Schmidt ex Maxim.) Ronse Decr.
- Fallopia Scandens (L.) Holub
- Fallopia ×bohemica (Chrtek & Chrtková) J.P. Bailey
- False 'ohe - Munroidendron Racemosum (Forbes) Sherff
- False Agoseris - Agoseris Glauca (Pursh) Raf. var. laciniata (D.C. Eaton) Smiley
- False Aloe - Manfreda Virginica (L.) Salisb. ex Rose
- False Amaranth - Digera Forssk.
- False Amaranth - Digera Muricata (L.) Mart.
- False Asphodel - Triantha (nutt.) Baker
- False Baby's Breath - Galium Mollugo L.
- False Babystars - Leptosiphon Androsaceus Benth.
- False Beardgrass - Chrysopogon Trin.
- False Beech Fern - Pseudophegopteris Keraudreniana (Gaudich.) Holttum
- False Bindweed - Calystegia R. Br.
- False Bird Of Paradise - Heliconia Platystachys Baker
- False Bird Of Paradise - Heliconia Rostrata Ruiz & Pav.
- False Bluet - Lucya Tetrandra (L.) K. Schum.
- False Boneset - Brickellia Eupatorioides (L.) Shinners
- False Boneset - Brickellia Eupatorioides (L.) Shinners var. chlorolepis (Wooton & Standl.) B.L. Turner
- False Boneset - Brickellia Eupatorioides (L.) Shinners var. corymbulosa (Torr. & A. Gray) Shinners
- False Boneset - Brickellia Eupatorioides (L.) Shinners var. eupatorioides
- False Boneset - Brickellia Eupatorioides (L.) Shinners var. floridana (R.W. Long) B.L. Turner
- False Boneset - Brickellia Eupatorioides (L.) Shinners var. gracillima (A. Gray) B.L. Turner
- False Boneset - Brickellia Eupatorioides (L.) Shinners var. texana (Shinners) Shinners
- False Box - Gyminda Sarg.
- False Breadnut - Pseudolmedia Spuria (Sw.) Griseb.
- False Brittlegrass - Dissochondrus (hillebr.) Kuntze
- False Brome - Brachypodium P. Beauv.
- False Brome - Brachypodium Rupestre (Host) Roem. & Schult.
- False Brome - Brachypodium Rupestre (Host) Roem. & Schult. ssp. caespitosum (Host) H. Scholz, orth.
- False Broomweed - Haploesthes A. Gray
- False Broomweed - Haploesthes Greggii A. Gray
- False Buffalograss - Munroa Squarrosa (Nutt.) Torr.
- False Buffalograss - Munroa Torr., orth. cons.
- False Buttercup - Kumlienia Greene
- False Buttonweed - Spermacoce L.
- False Calico - Loeselia L.
- False Candytuft - Smelowskia Borealis (Greene) Drury & Rollins
- False Carrot - Turgenia Hoffm.
- False Carrot - Yabea Microcarpa (Hook. & Arn.) Koso-Pol.
- False Chaff Flower - Chamissoa Altissima (Jacq.) Kunth
- False Chicken-sage - Vesicarpa Potentilloides (A. Gray) Rydb.
- False Chiggergrape - Coccoloba Venosa L.
- False Christmas Cactus - Schlumbergera Truncata (Haw.) Moran
- False Clapdaisy - Pseudoclappia Rydb.
- False Cloak Fern - Argyrochosma (sm.) Windham
- False Coffee - Faramea Aubl.
- False Coffee - Faramea Occidentalis (L.) A. Rich.
- False Coolwort - Bolandra A. Gray
- False Croton - Caperonia A. St.-Hil.
- False Daisy - Eclipta Prostrata (L.) L.
- False Daisyleaf Moonwort - Botrychium Pseudopinnatum W.H. Wagner
- False Dandelion - Nothocalais (a. Gray) Greene
- False Diamondflower - Ionopsidium Acaule (Desf.) Rchb.
- False Dogfennel - Dysodiopsis Tagetoides (Torr. & A. Gray) Rydb.
- False Evans' Reindeer Lichen - Cladina Pseudoevansii (Asah.) Hale & W.L. Culb.
- False Fanpetals - Billieturnera Fryxell
- False Fennel - Eupatorium Leptophyllum DC.
- False Fiddleleaf - Hydrolea L.
- False Flax - Camelina Crantz
- False Flax - Camelina Sativa (L.) Crantz
- False Fleabane - Pulicaria Gaertn.
- False Flowering Spurge - Euphorbia Pubentissima Michx.
- False Foxglove - Agalinis Raf.
- False Foxglove - Aureolaria Raf.
- False Freesia - Freesia Laxa (Thunb.) Goldblatt & J.C. Manning
- False Garlic - Nothoscordum Kunth
- False Gaura - Stenosiphon Linifolius (Nutt. ex James) Heynh.
- False Gilyflower - Allophyllum (nutt.) A.D. Grant & V.E. Grant
- False Goat's Beard - Astilbe Buch.-ham. ex D. Don
- False Golden Polypody - Phlebodium Pseudoaureum (Cav.) Lellinger
- False Goldenaster - Heterotheca Cass.
- False Goldeneye - Heliomeris Nutt.
- False Goldenweed - Oonopsis (nutt.) Greene
- False Grama - Cathestecum Erectum Vasey & Hack.
- False Grama - Cathestecum J. Presl
- False Hair Sedge - Carex Bulbostylis Mack.
- False Heather - Cuphea Hyssopifolia Kunth
- False Hellebore - Veratrum L.
- False Hellebore - Veratrum Nigrum L.
- False Helmetorchid - Erythrodes Blume
- False Himalayan Berry - Rubus Geniculatus Kaltenb.
- False Holly - Jaltomata Schltdl.
- False Hollyfern - Arachniodes Chaerophylloides (Poir.) Proctor
- False Hop Sedge - Carex Lupuliformis Sartwell ex Dewey
- False Horkelia - Horkeliella Rydb.
- False Indian Plantain - Hasteola Raf.
- False Indian Plantain - Hasteola Suaveolens (L.) Pojark.
- False Indianmallow - Allowissadula D.m. Bates
- False Indigo - Amorpha L.
- False Indigo - Amorpha ×notha Palmer
- False Indigo Bush - Amorpha Fruticosa L.
- False Ironwort - Hyptis Capitata Jacq.
- False Jagged-ckickweed - Lepyrodiclis Fenzl
- False Jagged-ckickweed - Lepyrodiclis Holosteoides (C.A. Mey.) Fenzl ex Fisch. & C.A. Mey.
- False Junco - Eleocharis Pachystyla (C. Wright) C.B. Clarke
- False Leopardbane - Doronicum L.
- False Lily Of The Valley - Maianthemum Dilatatum (Alph. Wood) A. Nelson & J.F. Macbr.
- False Lobelia - Trematolobelia Zahlbr. ex Rock
- False Locust - Hebestigma Cubense (Kunth) Urb.
- False Locust - Hebestigma Cubense (Kunth) Urb. var. cubense
- False Locust - Hebestigma Urb.
- False Madwort - Berteroa Dc.
- False Mallow - Malvastrum A. Gray
- False Mallow - Malvastrum Corchorifolium (Desv.) Britton ex Small
- False Mannagrass - Torreyochloa Church
- False Mastic - Sideroxylon Foetidissimum Jacq.
- False Mayweed - Tripleurospermum Maritimum (L.) W.D.J. Koch
- False Mayweed - Tripleurospermum Maritimum (L.) W.D.J. Koch ssp. maritimum
- False Mayweed - Tripleurospermum Maritimum (L.) W.D.J. Koch ssp. phaeocephalum (Rupr.) Hämet-Ahti
- False Meadowbeauty - Pterolepis Glomerata (Rottb.) Miq.
- False Melic - Schizachne Hack.
- False Melic - Schizachne Purpurascens (Torr.) Swallen
- False Mermaidweed - Floerkea Proserpinacoides Willd.
- False Monkeyflower - Mimetanthe Pilosa (Benth.) Greene
- False Mountain Willow - Salix Pseudomonticola C.R. Ball
- False Naked Buckwheat - Eriogonum Novonudum M. Peck
- False Needlegrass - Ptilagrostis Griseb.
- False Neststraw - Ancistrocarphus Filagineus A. Gray
- False Nettle - Boehmeria Jacq.
- False Ohelo - Wikstroemia Endl.
- False Oxtongue - Blumea Dc.
- False Pak Choi - Brassica Parachinensis L.H. Bailey
- False Pawpaw - Deeringothamnus Small
- False Pennyroyal - Hedeoma Pers.
- False Philippine Violet - Barleriola Solanifolia (L.) Oerst. ex Lindau
- False Pimpernel - Lindernia All.
- False Poison Sumac - Rhus Michauxii Sarg.
- False Prairie-clover - Marina Liebm.
- False Rhodes Grass - Trichloris Crinita (Lag.) Parodi
- False Rhodes Grass - Trichloris Fourn. ex Benth.
- False Rosemary - Conradina A. Gray
- False Rosemary - Conradina Canescens (Torr. & A. Gray ex Benth.) A. Gray
- False Rosinweed - Osmadenia Tenella Nutt.
- False Rubber Tree - Holarrhena Floribunda (G. Don) Durand & Schinz
- False Rue Anemone - Enemion Raf.
- False Russell's Fishscale Lichen - Psora Pseudorussellii Timdal
- False Sand Post Oak - Quercus ×pseudomargaretta Trel. (pro sp.)
- False Seaonion - Ornithogalum Caudatum Aiton
- False Semaphoregrass - Pleuropogon Sabinei R. Br.
- False Serviceberry - Malacomeles (decne.) Engelm.
- False Sesame - Ceratotheca Sesamoides Endl.
- False Shieldfern - Lastreopsis Effusa (Sw.) Tindale
- False Sicklepod - Senna Multijuga (Rich.) Irwin & Barneby
- False Silverback - Rainiera Stricta (Greene) Greene
- False Sisal - Agave Decipiens Baker
- False Snowparsley - Tilingia Ajanensis Regel & Tiling
- False Sowthistle - Reichardia Tingitana (L.) Roth
- False Spikeflower - Hollisteria Lanata S. Watson
- False Spiraea - Sorbaria (ser. ex DC.) A. Braun
- False Spiraea - Sorbaria Sorbifolia (L.) A. Braun
- False Spleenwort - Deparia Cataracticola M. Kato
- False Spleenwort - Deparia Hook. & Grev.
- False Spotted St. Johnswort - Hypericum Pseudomaculatum Bush
- False Springparsley - Pseudocymopterus J.m. Coult. & Rose
- False Sun-rose - Halimium (dunal) Spach
- False Sunflower - Phoebanthus S.f. Blake
- False Tamarind - Lysiloma Benth.
- False Tamarind - Lysiloma Latisiliquum (L.) Benth.
- False Tamarisk - Myrciaria Borinquena Alain
- False Threadleaf - Schkuhria Roth
- False Tick Trefoil - Codariocalyx Gyroides (Roxb. ex Link) Hassk.
- False Tiger Orchid - Elleanthus Cordidactylus Ackerman
- False Toadflax - Geocaulon Fernald
- False Toadflax - Geocaulon Lividum (Richardson) Fernald
- False Tungoiltree - Garcia Nutans Vahl [excluded]
- False Venus' Looking Glass - Legenere Limosa (Greene) McVaugh
- False Venus' Looking Glass - Legenere Mcvaugh
- False Watermeal - Uncinia Brevicaulis Thouars
- False Waterwillow - Andrographis Echioides (L.) Nees
- False Waterwillow - Andrographis Wall. ex Nees
- False Wheatgrass - Eremopyrum (ledeb.) Jaubert & Spach
- False Yam - Icacina Senegalensis A. Juss.
- False Yellowhead - Dittrichia Viscosa (L.) Greuter
- False Yucca - Hesperaloe Engelm.
- Falsegold Groundsel - Packera Pseudaurea (Rydb.) W.A. Weber & Á. Löve
- Falsegold Groundsel - Packera Pseudaurea (Rydb.) W.A. Weber & Á. Löve var. flavula (Greene) D.K. Trock &
- Falsegold Groundsel - Packera Pseudaurea (Rydb.) W.A. Weber & Á. Löve var. pseudaurea
- Falsegold Groundsel - Packera Pseudaurea (Rydb.) W.A. Weber & Á. Löve var. semicordata (Mack. & Bush) D.K
- Falsenerved Bristle Fern - Trichomanes Falsinervulosum (M. Nishida) Fosberg
- Falseteeth - Capparis Flexuosa (L.) L.
- Falseteeth Skullcap - Scutellaria Pseudoserrata Epling
- Fameflower - Talinum Adans.
- Fan Clubmoss - Lycopodium Digitatum Dill. ex A. Braun
- Fan Columbine - Aquilegia Flabellata Siebold & Zucc.
- Fan Maidenhair - Adiantum Tenerum Sw.
- Fan Palm - Chamaerops L.
- Fan Palm - Washingtonia H. Wendl.
- Fan Spikemoss - Selaginella Flabellata (L.) Spring [excluded]
- Fancy Nightshade - Solanum Tenuipes Bartlett
- Fancy Nightshade - Solanum Tenuipes Bartlett var. latisectum M.D. Whalen
- Fancy Nightshade - Solanum Tenuipes Bartlett var. tenuipes
- Fanleaf Crinklemat - Tiquilia Plicata (Torr.) A.T. Richardson
- Fanleaf Dwarf Polypody - Melpomense Flabelliformis (Poir.) A.R. Sm. & C.R. Moran
- Fanleaf - Fioria Mattei
- Fanleaf Fleabane - Erigeron Flabellifolius Rydb.
- Fanleaf Geranium - Geranium Divaricatum Ehrh.
- Fanleaf Hawthorn - Crataegus Flabellata (Bosc ex Spach) K. Koch
- Fanleaf Vervain - Verbena Plicata Greene
- Fanleaf Yam - Dioscorea Flabellifolia Prain & Burkill
- Fanmustard - Nerisyrenia Greene
- Fanpetals - Sida L.
- Fanshape Orchid - Cochleanthes Flabelliformis (Sw.) R.E. Schult. & Garay
- Fanwort - Cabomba Aubl.
- Far-eastern Smartweed - Polygonum Extremiorientale Vorosch.
- Faradaya F. Muell.
- Faradaya Powellii Seem. ex Powell
- Farewell To Spring - Clarkia Amoena (Lehm.) A. Nelson & J.F. Macbr.
- Farewell To Spring - Clarkia Amoena (Lehm.) A. Nelson & J.F. Macbr. ssp. amoena
- Farewell To Spring - Clarkia Amoena (Lehm.) A. Nelson & J.F. Macbr. ssp. caurina (Abrams ex Piper) F
- Farewell To Spring - Clarkia Amoena (Lehm.) A. Nelson & J.F. Macbr. ssp. huntiana (Jeps.) F.H. Lewis
- Farinose Cartilage Lichen - Ramalina Farinacea (L.) Ach.
- Farinose Crabseye Lichen - Ochrolechia Farinacea Howard
- Farinose Cup Lichen - Cladonia Farinacea (Vain.) A. Evans
- Farkleberry - Vaccinium Arboreum Marshall
- Farlow's Petractis - Petractis Farlowii (Tuck. ex Nyl.) Vezda
- Farnoldia Hypocrita (A. Massal.) Froberg
- Farnoldia Lichen - Farnoldia Hertel
- Farnoldia Lichen - Farnoldia Jurana (Schaerer) Hertel
- Farnoldia Lichen - Farnoldia Micropsis (A. Massal.) Hertel
- Farnsworth's Jewelflower - Streptanthus Farnsworthianus J.T. Howell
- Farr's Willow - Salix Farriae C.R. Ball
- Farwell's Blue-eyed Grass - Sisyrinchium Farwellii E.P. Bicknell
- Farwell's Watermilfoil - Myriophyllum Farwellii Morong
- Fascicled Beaksedge - Rhynchospora Fascicularis (Michx.) Vahl
- Fascicled Beaksedge - Rhynchospora Fascicularis (Michx.) Vahl var. distans (Michx.) Chapm.
- Fascicled Beaksedge - Rhynchospora Fascicularis (Michx.) Vahl var. fascicularis
- Fassett's Juniper - Juniperus ×fassettii B. Boivin
- Fassett's Water-starwort - Callitriche Fassettii Schotsman
- Fastigiate Mouse-ear Chickweed - Cerastium Fastigiatum Greene
- Father-and-child Plant - Euchiton Japonicus (Thunb.) Anderb.
- Fatoua - Fatoua Gaudich.
- Fatpork - Chione Venosa (Sw.) Urb.
- Fatsia - Fatsia Decne. & Planch.
- Fatsia Horrida (Sm.) Benth. & Hook. f. ex W.H. Brewer & S. Watson
- Fauria Crista-galli (Menzies ex Hook.) Makino
- Faurie's Club - Cheirodendron Fauriei Hochr.
- Faurie's Cyanea - Cyanea Fauriei Levl.
- Faurie's Hypopterygium Moss - Hypopterygium Fauriei Besch.
- Faurie's Panicgrass - Panicum Fauriei Hitchc.
- Faurie's Panicgrass - Panicum Fauriei Hitchc. var. carteri (Hosaka) Davidse
- Faurie's Panicgrass - Panicum Fauriei Hitchc. var. fauriei
- Faurie's Panicgrass - Panicum Fauriei Hitchc. var. latius (H. St. John) Davidse
- Faux Persil - Cardiospermum Corindum L.
- Fava Bean - Vicia Faba L.
- Fawnlily - Erythronium L.
- Fawnlily - Erythronium Quinaultense Allen
- Fayette Wart Lichen - Verrucaria Fayettensis Servit
- Fayodia Leucophylla (A. Gillet) M.T. Lange
- Fayodia Lichen - Fayodia Kuhner
- Fayodia Lichen - Fayodia Striatula (Kuhner) Singer
- Fe'i Banana - Musa Troglodytarum L.
- Feather Fingergrass - Chloris Virgata Sw.
- Feather Pappusgrass - Enneapogon Desv. ex P. Beauv.
- Feather Reed Grass - Calamagrostis ×acutiflora (Schrad.) Rchb.
- Feather River Monardella - Monardella Stebbinsii Hardham & Bartel
- Feather River Stonecrop - Sedum Albomarginatum R.T. Clausen
- Feather-head Knapweed - Centaurea Trichocephala M. Bieb. ex Willd.
- Featherbells - Stenanthium (a. Gray) Kunth
- Featherbristle Beaksedge - Rhynchospora Oligantha A. Gray
- Feathered Mosquitofern - Azolla Pinnata R. Br.
- Feathered Mosquitofern - Azolla Pinnata R. Br. ssp. asiatica R.M.K. Saunders & K. Fowler
- Feathered Mosquitofern - Azolla Pinnata R. Br. ssp. pinnata
- Feathered Pink - Dianthus Plumarius L.
- Featherleaf Cinquefoil - Potentilla Multisecta (S. Watson) Rydb.
- Featherleaf Desertpeony - Acourtia Runcinata (Lag. ex D. Don) B.L. Turner
- Featherleaf Fleabane - Erigeron Pinnatisectus (A. Gray) A. Nelson
- Featherleaf Kittentails - Synthyris Pinnatifida S. Watson
- Featherleaf Kittentails - Synthyris Pinnatifida S. Watson var. lanuginosa (Piper) Cronquist
- Featherleaf Kittentails - Synthyris Pinnatifida S. Watson var. pinnatifida
- Featherleaf Pepperweed - Lepidium Pinnatifidum Ledeb.
- Featherleaf Springparsley - Cymopterus Beckii S.L. Welsh & Goodrich
- Featherplume - Dalea Formosa Torr.
- Feathershank - Schoenocaulon A. Gray
- Featherstem Clubmoss - Lycopodiella Prostrata (Harper) Cranfill
- Feathertop - Pennisetum Villosum R. Br. ex Fresen.
- Featherweed - Gamochaeta Ustulata (Nutt.) G.L. Nesom
- Feathery False Lily Of The Valley - Maianthemum Racemosum (L.) Link
- Feathery False Lily Of The Valley - Maianthemum Racemosum (L.) Link ssp. amplexicaule (Nutt.) LaFrankie
- Feathery False Lily Of The Valley - Maianthemum Racemosum (L.) Link ssp. racemosum
- Feay's Palafox - Palafoxia Feayi A. Gray
- Feay's Prairie Clover - Dalea Feayi (Chapm.) Barneby
- Fecund Jelly Lichen - Collema Fecundum Degel.
- Fecund Schadonia Lichen - Schadonia Fecunda (Th. Fr.) Vezda & Poelt
- Fee's Spleenwort - Asplenium Feei Kunze ex Fée
- Feefee - Centrosema Plumieri (Turp. ex Pers.) Benth.
- Feijoa - Feijoa O. Berg
- Feijoa - Feijoa Sellowiana (O. Berg) O. Berg
- Felicia Amoena (Sch. Bip.) Levyns
- Felicia Cass.
- Felicia Fruticosa (L.) G. Nicholson
- Felicia Uliginosa (J.M. Wood & M.S. Evans) Grau
- Fellfield Whitlowgrass - Draba Arctogena (E. Ekman) E. Ekman
- Fellhanera Floridana (Tuck.) S. Ekman
- Fellhanera Lichen - Fellhanera Aurantiaca (Vezda) Vezda
- Fellhanera Lichen - Fellhanera Vezda
- Fellhanera Subtilis (Vezda) Diederich & Serusiaux
- Felt Lichen - Peltigera Aphthosa (L.) Willd.
- Felt Lichen - Peltigera Canina (L.) Willd.
- Felt Lichen - Peltigera Collina (Ach.) Schrad.
- Felt Lichen - Peltigera Didactyla (With.) J.R. Laundon
- Felt Lichen - Peltigera Lepidophora (Vain.) Bitter
- Felt Lichen - Peltigera Leucophlebia (Nyl.) Gyel.
- Felt Lichen - Peltigera Malacea (Ach.) Funck
- Felt Lichen - Peltigera Neopolydactyla (Gyel.) Gyel.
- Felt Lichen - Peltigera Polydactylon (Neck.) Hoffm.
- Felt Lichen - Peltigera Ponojensis Gyel.
- Felt Lichen - Peltigera Praetextata (Flörke ex Sommerf.) Zopf
- Felt Lichen - Peltigera Retifoveata Vitik.
- Felt Lichen - Peltigera Rufescens (Weiss) Humb.
- Felt Lichen - Peltigera Scabrosa Th. Fr.
- Felt Lichen - Peltigera Venosa (L.) Hoffm.
- Felt Lichen - Peltigera Willd.
- Feltleaf Bluestar - Amsonia Tharpii Woodson
- Feltleaf Ceanothus - Ceanothus Arboreus Greene
- Feltleaf Monardella - Monardella Hypoleuca A. Gray ssp. lanata (Abrams) Munz
- Feltleaf Violet - Viola Tomentosa M.S. Baker & J.C. Clausen
- Feltleaf Willow - Salix Alaxensis (Andersson) Coville
- Feltleaf Willow - Salix Alaxensis (Andersson) Coville var. alaxensis
- Feltleaf Willow - Salix Alaxensis (Andersson) Coville var. longistylis (Rydb.) C.K. Schneid.
- Felwort - Swertia L.
- Felwort - Swertia Perennis L.
- Female Karata - Furcraea Tuberosa (Mill.) W.T. Aiton
- Fen Bedstraw - Galium Uliginosum L.
- Fen Grass Of Parnassus - Parnassia Glauca Raf.
- Fence Morning-glory - Ipomoea Ochracea (Lindl.) G. Don
- Fenceline Dewberry - Rubus Exsularis L.H. Bailey
- Fendler Threeawn - Aristida Purpurea Nutt. var. longiseta (Steud.) Vasey
- Fendler's Aster - Symphyotrichum Fendleri (A. Gray) G.L. Nesom
- Fendler's Bedstraw - Galium Fendleri A. Gray
- Fendler's Bladderpod - Lesquerella Fendleri (A. Gray) S. Watson
- Fendler's Brachythecium Moss - Brachythecium Fendleri (Sull.) A. Jaeger
- Fendler's Brickellbush - Brickelliastrum Fendleri (A. Gray) R.M. King & H. Rob.
- Fendler's Ceanothus - Ceanothus Fendleri A. Gray
- Fendler's Cowbane - Oxypolis Fendleri (A. Gray) A. Heller
- Fendler's Desertdandelion - Malacothrix Fendleri A. Gray
- Fendler's Drymary - Drymaria Glandulosa C. Presl
- Fendler's False Cloak Fern - Argyrochosma Fendleri (Kunze) Windham
- Fendler's Flatsedge - Cyperus Fendlerianus Boeckeler
- Fendler's Globemallow - Sphaeralcea Fendleri A. Gray
- Fendler's Globemallow - Sphaeralcea Fendleri A. Gray ssp. fendleri
- Fendler's Groundcherry - Physalis Hederifolia A. Gray var. fendleri (A. Gray) Cronquist
- Fendler's Horsenettle - Solanum Fendleri A. Gray ex Torr.
- Fendler's Horsenettle - Solanum Fendleri A. Gray ex Torr. var. fendleri
- Fendler's Lipfern - Cheilanthes Fendleri Hook.
- Fendler's Meadow-rue - Thalictrum Fendleri Engelm. ex A. Gray
- Fendler's Meadow-rue - Thalictrum Fendleri Engelm. ex A. Gray var. fendleri
- Fendler's Meadow-rue - Thalictrum Fendleri Engelm. ex A. Gray var. polycarpum Torr.
- Fendler's Pennycress - Noccaea Fendleri (A. Gray) Holub
- Fendler's Pennycress - Noccaea Fendleri (A. Gray) Holub ssp. fendleri
- Fendler's Penstemon - Penstemon Fendleri Torr. & A. Gray
- Fendler's Ragwort - Packera Fendleri (A. Gray) W.A. Weber & Á. Löve
- Fendler's Rockcress - Arabis Fendleri (S. Watson) Greene
- Fendler's Rockcress - Arabis Fendleri (S. Watson) Greene var. fendleri
- Fendler's Sandmat - Chamaesyce Fendleri (Torr. & A. Gray) Small
- Fendler's Sandwort - Arenaria Fendleri A. Gray
- Fendler's Sandwort - Arenaria Fendleri A. Gray var. brevifolia (Maguire) Maguire
- Fendler's Sandwort - Arenaria Fendleri A. Gray var. fendleri
- Fendler's Springparsley - Cymopterus Acaulis (Pursh) Raf. var. fendleri (A. Gray) Goodrich
- Fendler's Threeawn - Aristida Purpurea Nutt. var. fendleriana (Steud.) Vasey
- Fendler's Townsend Daisy - Townsendia Fendleri A. Gray
- Fendler's Tuckermannopsis Lichen - Tuckermannopsis Fendleri (Nyl.) Hale
- Fendler's Waterleaf - Hydrophyllum Fendleri (A. Gray) A. Heller
- Fendler's Waterleaf - Hydrophyllum Fendleri (A. Gray) A. Heller var. fendleri
- Fendlera Linearis auct. non Rehder
- Fendlera Rupicola A. Gray var. falcata (Thornb.) Rehder
- Fendlera Rupicola A. Gray var. wrightii A. Gray
- Fendlerbush - Fendlera Engelm. & A. Gray
- Fendlerbush - Fendlerella (greene) A. Heller
- Fennel - Foeniculum Mill.
- Fenugreek - Trigonella L.
- Fenzl's False Spleenwort - Deparia Fenzliana (Luerss.) M. Kato
- Ferchel's Bryum Moss - Bryum Capillare Hedw. var. ferchelii (Brid.) Bruch & Schimp.
- Fern Flatsedge - Cyperus Filicinus Vahl
- Fern-leaf Acacia - Vachellia Pennatula (Schltdl. & Cham.) Seigler & Ebinger
- Fern-leaf Catalina Ironwood - Lyonothamnus Floribundus A. Gray ssp. aspleniifolius (Greene) P.H. Raven
- Fern-leaved Monkeyflower - Mimulus Filicifolius Sexton, K.G. Ferris & Schoenig
- Fern-leaved Tamarind - Tristiropsis Acutangula Radlk.
- Fernald's Beaksedge - Rhynchospora Fernaldii Gale
- Fernald's Bluegrass - Poa Laxa Haenke ssp. fernaldiana (Nannf.) Hyl.
- Fernald's False Mannagrass - Torreyochloa Pallida (Torr.) Church var. fernaldii (Hitchc.) Dore ex Koyama & Kawano
- Fernald's Iris - Iris Fernaldii R.C. Foster
- Fernald's Milkvetch - Astragalus Robbinsii (Oakes) A. Gray var. fernaldii (Rydb.) Barneby
- Fernald's Northern Rockcress - Braya Fernaldii Abbe
- Fernald's Sedge - Carex Merritt-fernaldii Mack.
- Fernald's Ticktrefoil - Desmodium Fernaldii B.G. Schub.
- Fernald's Yellowcress - Rorippa Palustris (L.) Besser ssp. fernaldiana (Butters & Abbe) Jonsell
- Fernaldia - Fernaldia Brachypharynx Woodson
- Fernaldia - Fernaldia Woodson
- Ferngrass - Catapodium Link
- Ferngrass - Catapodium Rigidum (L.) C.E. Hubbard ex Dony
- Fernleaf Biscuitroot - Lomatium Dissectum (Nutt.) Mathias & Constance
- Fernleaf Biscuitroot - Lomatium Dissectum (Nutt.) Mathias & Constance var. dissectum
- Fernleaf False Candytuft - Smelowskia Calycina (Stephan ex Willd.) C.A. Mey. var. integrifolia (Seem.) Rollins
- Fernleaf False Candytuft - Smelowskia Media (Drury & Rollins) G. Mulligan
- Fernleaf Goldthread - Coptis Aspleniifolia Salisb.
- Fernleaf Licorice-root - Ligusticum Filicinum S. Watson
- Fernleaf Phacelia - Phacelia Bipinnatifida Michx.
- Fernleaf Yarrow - Achillea Filipendulina Lam.
- Fernleaf Yellow False Foxglove - Aureolaria Pedicularia (L.) Raf.
- Fernleaf Yellow False Foxglove - Aureolaria Pedicularia (L.) Raf. var. ambigens (Fernald) Farw.
- Fernleaf Yellow False Foxglove - Aureolaria Pedicularia (L.) Raf. var. austromontana Pennell
- Fernleaf Yellow False Foxglove - Aureolaria Pedicularia (L.) Raf. var. intercedens Pennell
- Fernleaf Yellow False Foxglove - Aureolaria Pedicularia (L.) Raf. var. pedicularia
- Fernleaved Pedicularis - Pedicularis Cystopteridifolia Rydb.
- Fernow Oak - Quercus ×fernowii Trel.
- Ferntree - Filicium Decipiens (Wight & Arn.) Thwaites
- Ferntree - Filicium Thwaites
- Ferocactus Acanthodes (Lem.) Britton & Rose
- Ferocactus Acanthodes (Lem.) Britton & Rose var. eastwoodiae L.D. Benson
- Ferocactus Acanthodes (Lem.) Britton & Rose var. lecontei (Engelm.) Lindsay
- Ferocactus Covillei Britton & Rose
- Ferocactus Cylindraceus (Engelm.) Orcutt ssp. lecontei (Engelm.) N.P. Taylor
- Ferocactus Cylindraceus (Engelm.) Orcutt var. eastwoodiae (L.D. Benson) N.P. Taylor
- Ferocactus Hamatacanthus (Muehlenpf.) Britton & Rose ssp. sinuatus (A. Dietr.) N.P. Taylo
- Ferocactus Lecontei (Engelm.) Britton & Rose
- Ferocactus Setispinus (Engelm.) L.D. Benson
- Ferocactus Uncinatus (Galeotti) Britton & Rose var. wrightii (Engelm.) N.P. Taylor
- Feronia Limonia (L.) Swingle
- Ferris' Goldfields - Lasthenia Ferrisiae Ornduff
- Ferris' Milkvetch - Astragalus Tener A. Gray var. ferrisiae A. Liston
- Ferris' Sandwort - Arenaria Macradenia S. Watson ssp. ferrisiae Abrams
- Ferron's Milkvetch - Astragalus Musiniensis M.E. Jones
- Ferruginous Clerodendrum - Clerodendrum Trichotomum Thunb. var. ferrugineum Nakai
- Ferula - Ferula L.
- Ferula - Ferula Narthex Boiss.
- Ferula Foetida (Bunge) Regel
- Ferula Galbaniflua Boiss. & Buhse
- Ferula Macrocarpa Hook. & Arn.
- Fescue Airplant - Tillandsia Borinquensis Cedeño-Mald. & Proctor
- Fescue - Festuca Edlundiae S. Aiken, Consaul & Lefkovitch
- Fescue - Festuca L.
- Fescue - Festuca Pseudovivipara (Pavlick) Pavlick
- Fescue - Festuca ×villosa-vivipara (Rosenv.) E.B. Alexeev
- Fescue Ryegrass - ×schedolium Holub
- Fescue Ryegrass - ×schedolium Loliaceum (Huds.) Holub
- Fescue Sandwort - Arenaria Capillaris Poir. ssp. americana Maguire
- Fescue - Schedonorus P. Beauv.
- Fescue - Schedonorus ×aschersonianus (Dörfl.) Holub
- Fescue Sedge - Carex Festucacea Schkuhr ex Willd.
- Fescue - Vulpia C.c. Gmel.
- Festuca Altaica Trin. ssp. hallii (Vasey) V.L. Harms
- Festuca Altaica Trin. ssp. scabrella (Torr. ex Hook.) Hultén
- Festuca Altaica Trin. subvar. hallii (Vasey) St.-Yves
- Festuca Altaica Trin. var. major (Vasey) Gleason
- Festuca Altaica Trin. var. scabrella (Torr. ex Hook.) Breitung
- Festuca Altissima All.
- Festuca Amethystina L. [excluded]
- Festuca Ampla Hack.
- Festuca Arenaria Osbeck, non Lam.
- Festuca Arida Elmer
- Festuca Arundinacea Schreb.
- Festuca Aucta Krecz. & Bobr.
- Festuca Barbata Loefl. ex L.
- Festuca Beckeri (Hack.) Trautv.
- Festuca Beckeri (Hack.) Trautv. ssp. polesica (Zapal.) Tzvelev
- Festuca Brachyphylla Schult. ex Schult. & Schult. f. ssp. breviculmis Frederiksen
- Festuca Brachyphylla Schult. ex Schult. & Schult. f. var. brachyphylla
- Festuca Brachyphylla Schult. ex Schult. & Schult. f. var. coloradensis (Frederiksen)
- Festuca Brachyphylla Schult. ex Schult. & Schult. f. var. endotera (St.-Yves) Litard.
- Festuca Brachyphylla Schult. ex Schult. & Schult. f. var. groenlandica Schol.
- Festuca Brachyphylla Schult. ex Schult. & Schult. f. var. rydbergii (St.-Yves) Cronqu
- Festuca Brevifolia R. Br. subvar. genuina St.-Yves
- Festuca Brevifolia R. Br. var. utahensis St.-Yves
- Festuca Brevifolia R. Br., non Muhl.
- Festuca Bromoides L.
- Festuca Burnatii St.-Yves
- Festuca Caerulescens Desf.
- Festuca Californica Vasey var. parishii (Piper) Hitchc.
- Festuca Capillata Lam.
- Festuca Ciliata auct. non Danthoine ex Lam. & DC., non Gouan nec Link
- Festuca Cinerea auct. non Vill.
- Festuca Confinis Vasey
- Festuca Confusa Piper
- Festuca Cretacea T.N. Popova & Proskor.
- Festuca Cristata L.
- Festuca Danthonii auct. non Asch. & Graebn.
- Festuca Decumbens L.
- Festuca Densiuscula (Hack. ex Piper) Alexeev
- Festuca Dertonensis (All.) Asch. & Graebn.
- Festuca Diffusa Dumort.
- Festuca Diffusa Dumort. var. multiflora (Hoffm.) Asch. & Graebn.
- Festuca Dimorpha Guss.
- Festuca Drymeia Mert. & W.D.J. Koch, orth. var.
- Festuca Drymeja Mert. & W.D.J. Koch
- Festuca Durandoi Clauson
- Festuca Duriuscula L. var. cinerea auct. non (Vill.) Krajina
- Festuca Duriuscula auct. non L.
- Festuca Eastwoodiae Piper
- Festuca Elatior L. ssp. arundinacea (Schreb.) Hack.
- Festuca Elatior L. var. arundinacea (Schreb.) Wimm.
- Festuca Elatior L., nom. utique rej.
- Festuca Elegans Boiss.
- Festuca Elmeri Scribn. & Merr. ssp. luxurians Piper
- Festuca Elmeri Scribn. & Merr. var. conferta (Hack. ex Beal) Hitchc.
- Festuca Eskia Ramond ex DC.
- Festuca Extremiorientalis Ohwi
- Festuca Fallax Thuill.
- Festuca Fenas Lag.
- Festuca Filiformis Lam.
- Festuca Fluitans L.
- Festuca Geniculata L.
- Festuca Gigantea (L.) Vill.
- Festuca Glauca Lam., non Vill.
- Festuca Gracilenta Buckley
- Festuca Grayi Piper
- Festuca Hervieri Patzke
- Festuca Hitchcockianus Alexeev
- Festuca Howellii Hack. ex Beal
- Festuca Idahoensis Elmer var. oregona (Hack. ex Beal) C.L. Hitchc.
- Festuca Idahoensis Elmer var. roemeri Pavlick
- Festuca Ingrata (Hack. ex Beal) Rydb.
- Festuca Kingii (S. Watson) Cassidy
- Festuca Kitaibeliana Schult. [excluded]
- Festuca Longifolia auct. non Thuill.
- Festuca Mairei St.-Yves
- Festuca Mariettana Alexeev
- Festuca Megalura Nutt.
- Festuca Megalura Nutt. var. hirsuta (Hack.) Asch. & Graebn.
- Festuca Michiganica Alexeev
- Festuca Microstachys Nutt.
- Festuca Microstachys Nutt. var. ciliata Beal
- Festuca Microstachys Nutt. var. pauciflora Scribn. ex Beal
- Festuca Microstachys Nutt. var. simulans (Hoover) Hoover
- Festuca Montana M. Bieb.
- Festuca Multiflora Hoffm.
- Festuca Myuros L.
- Festuca Nigrescens Lam.
- Festuca Novae-zelandiae (Hack.) Cockayne
- Festuca Nutans Biehler
- Festuca Obtusa Biehler
- Festuca Occidentalis Hook. var. ingrata (Hack. ex Beal) B. Boivin
- Festuca Occidentalis Hook. var. oregona (Hack.) B. Boivin
- Festuca Octoflora Walter
- Festuca Octoflora Walter ssp. hirtella Piper
- Festuca Octoflora Walter var. aristulata Torr. ex L.H. Dewey
- Festuca Octoflora Walter var. glauca (Nutt.) Fernald
- Festuca Octoflora Walter var. hirtella (Piper) Piper ex Hitchc.
- Festuca Octoflora Walter var. tenella (Willd.) Fernald
- Festuca Oregona Vasey
- Festuca Ovina L. ssp. alaskana Holmen
- Festuca Ovina L. ssp. beckeri Hack.
- Festuca Ovina L. ssp. brevifolia (S. Watson) Hack. p.p.
- Festuca Ovina L. ssp. novae-zelandiae Hack.
- Festuca Ovina L. ssp. tenuifolia (Sibth.) Peterm.
- Festuca Ovina L. var. alaskana (Holmen) S.L. Welsh
- Festuca Ovina L. var. alpina (Gaudin) W.D.J. Koch
- Festuca Ovina L. var. arizonica (Vasey) Hack. ex Veal
- Festuca Ovina L. var. borealis Lange
- Festuca Ovina L. var. brachyphylla (Schult. ex Schult. & Schult. f.) Piper ex
- Festuca Ovina L. var. brevifolia S. Watson p.p.
- Festuca Ovina L. var. brevifolia auct. p.p.
- Festuca Ovina L. var. capillata (Lam.) Alef.
- Festuca Ovina L. var. columbiana Beal
- Festuca Ovina L. var. duriuscula auct. non (L.) W.D.J. Koch
- Festuca Ovina L. var. gallica (Hack.) St.-Yves ex Litard.
- Festuca Ovina L. var. glauca (Lam.) W.D.J. Koch
- Festuca Ovina L. var. ingrata Hack. ex Beal
- Festuca Ovina L. var. minutiflora (Rydb.) J.T. Howell
- Festuca Ovina L. var. oregona Hack. ex Beal
- Festuca Ovina L. var. polyphylla Vasey ex Beal
- Festuca Ovina L. var. purpusiana St.-Yves
- Festuca Ovina L. var. rydbergii St.-Yves
- Festuca Ovina L. var. saximontana (Rydb.) Gleason
- Festuca Ovina L. var. supina (Schur) Hack.
- Festuca Ovina L. var. tenuifolia (Sibth.) Sm.
- Festuca Ovina L. var. vivipara L.
- Festuca Ovina auct. non L.
- Festuca Pacifica Piper
- Festuca Pacifica Piper var. simulans Hoover
- Festuca Pallens Host
- Festuca Pallescens (St.-Yves) Parodi
- Festuca Picturata Pils
- Festuca Polesica Zapal.
- Festuca Porcii Hack.
- Festuca Pratensis Huds.
- Festuca Prolifera (Piper) Fernald
- Festuca Prolifera (Piper) Fernald var. lasiolepis Fernald
- Festuca Psammophila (Hack. ex Celak.) Fritsch
- Festuca Pseudodalmatica Krajina ex Domin
- Festuca Reflexa Buckley
- Festuca Richardsonii Hook.
- Festuca Richardsonii Hook. ssp. cryophila (Krecz. & Bobr.) Á. Löve & D. Löve
- Festuca Rigescens (J. Presl) Kunth [excluded]
- Festuca Rivularis Boiss.
- Festuca Roemeri (Pavlick) Alexeev
- Festuca Rubra L. ssp. arctica auct. non (Hack.) Govor.
- Festuca Rubra L. ssp. arenicola Alexeev
- Festuca Rubra L. ssp. bartherei (Timb.-Lagr.) P. Fourn.
- Festuca Rubra L. ssp. commutata Gaudin
- Festuca Rubra L. ssp. cryophila (Krecz. & Bobr.) Hultén
- Festuca Rubra L. ssp. densiuscula Hack. ex Piper
- Festuca Rubra L. ssp. falax (Thuill.) Nyman, database artifact
- Festuca Rubra L. ssp. juncea (Hack.) Soó
- Festuca Rubra L. ssp. megastachys Gaudin
- Festuca Rubra L. ssp. megastachys sensu Piper p.p., non Gaudin
- Festuca Rubra L. ssp. richardsonii (Hook.) Hultén
- Festuca Rubra L. ssp. rubra var. planifolia Hack.
- Festuca Rubra L. ssp. vulgaris (Gaudin) Hayek
- Festuca Rubra L. var. arenaria (Osbeck) Fr.
- Festuca Rubra L. var. commutata Gaudin
- Festuca Rubra L. var. grandiflora Hack.
- Festuca Rubra L. var. heterophylla (Lam.) Mutel
- Festuca Rubra L. var. juncea (Hack.) K. Richt.
- Festuca Rubra L. var. lanuginosa Mert. & W.D.J. Koch
- Festuca Rubra L. var. littoralis Vasey ex Beal
- Festuca Rubra L. var. mediana Pavlick
- Festuca Rubra L. var. megastachys (Gaudin) Hegi
- Festuca Rubra L. var. megastachys auct. non (Gaudin) Hegi
- Festuca Rubra L. var. multiflora (Hoffm.) Asch. & Graebn.
- Festuca Rubra L. var. mutica Hartm.
- Festuca Rubra L. var. prolifera (Piper) Piper
- Festuca Rubra L. var. pruinosa Hack.
- Festuca Rubra L. var. rivularis (Boiss.) Hack.
- Festuca Rupicaprina (Hack.) A. Kern.
- Festuca Rupicola Heuff.
- Festuca Saxatilis Schur
- Festuca Saximontana Rydb. var. robertsiana Pavlick
- Festuca Scabrella Torr. ex Hook.
- Festuca Scabrella Torr. ex Hook. ssp. hallii (Vasey) W.A. Weber
- Festuca Scabrella Torr. ex Hook. var. major Vasey
- Festuca Scabriuscula Phil.
- Festuca Sciurea Nutt.
- Festuca Sclerophylla Boiss. ex Bisch.
- Festuca Scoparia Hook. f.
- Festuca Shortii Kunth ex Alph. Wood
- Festuca Spadicea L. ssp. durandoi (Clauson) Jahand. & Maire
- Festuca Spectabilis Jan
- Festuca Stricta Host
- Festuca Suksdorfii Piper ex Suksd.
- Festuca Sulcata (Hack.) Beck
- Festuca Sulcata (Hack.) Beck var. valesiaca (Schleich. ex Gaudin) Domin
- Festuca Supina auct. non Schur
- Festuca Sylvatica Huds.
- Festuca Tatrae (Czako) Degen
- Festuca Tenella Willd.
- Festuca Tenella Willd. var. glauca Nutt.
- Festuca Tenuifolia Sibth.
- Festuca Trachyphylla (Hack.) Krajina, nom. illeg.
- Festuca Tracyi Hitchc.
- Festuca Uechtritziana Wiesb.
- Festuca Unioloides (Willd.) Raspail, non Bromus unioloides Kunth, nom. illeg.
- Festuca Valesiaca Schleich. ex Gaudin ssp. saxatilis (Schur) E.B. Alexeev
- Festuca Vallicola Rydb.
- Festuca Violacea Schleich. ex Gaudin
- Festuca Violacea Schleich. ex Gaudin ssp. picta (Kit. ex Schult.) Brand
- Festuca Vivipara (L.) Sm. ssp. glabra Frederiksen
- Festuca Vivipara (L.) Sm. ssp. vivipara
- Festuca Vivipara auct. non (L.) Sm.
- Festuca Xanthina Roem. & Schult.
- Festuca ×aschersoniana Dörfl.
- Festulolium - ×festulolium Asch. & Graebn.
- Fetid Adderstongue - Scoliopus Torr.
- Fetid Goosefoot - Dysphania Graveolens (Willd.) Mosyakin & Clemants
- Fetid Marigold - Dyssodia Papposa (Vent.) Hitchc.
- Fetid Passionflower - Passiflora Foetida L.
- Fetid Passionflower - Passiflora Foetida L. var. foetida
- Fetterbush Lyonia - Lyonia Lucida (Lam.) K. Koch
- Fetterbush - Pieris D. Don
- Feverfew - Parthenium L.
- Feverfew - Tanacetum Parthenium (L.) Sch. Bip.
- Fevertree - Pinckneya Bracteata (W. Bartram) Raf.
- Fevertree - Vachellia Xanthophloea (Benth.) Banfi & Galasso
- Feverwort - Triosteum Perfoliatum L.
- Fevillea - Fevillea L.
- Few-flower Fumitory - Fumaria Reuteri Boiss.
- Few-flowered Cotoneaster - Cotoneaster Nitens Rehder & E.H. Wilson
- Fewflower Beaksedge - Rhynchospora Rariflora (Michx.) Elliott
- Fewflower Beggarticks - Bidens Leptocephala Sherff
- Fewflower Blazing Star - Liatris Pauciflora Pursh
- Fewflower Buckwheat - Eriogonum Pauciflorum Pursh
- Fewflower Buckwheat - Eriogonum Pauciflorum Pursh var. gnaphalodes (Benth.) Reveal
- Fewflower Buckwheat - Eriogonum Pauciflorum Pursh var. pauciflorum
- Fewflower Clover - Trifolium Oliganthum Steud.
- Fewflower Draba - Draba Pauciflora R. Br.
- Fewflower Evening Primrose - Camissonia Breviflora (Torr. & A. Gray) P.H. Raven
- Fewflower Fumewort - Corydalis Pauciflora (Stephan) Pers.
- Fewflower Hairsedge - Bulbostylis Pauciflora (Liebm.) C.B. Clarke
- Fewflower Holdback - Caesalpinia Pauciflora (Griseb.) C. Wright ex Sauvalle
- Fewflower Jacob's-ladder - Polemonium Pauciflorum S. Watson
- Fewflower Jacob's-ladder - Polemonium Pauciflorum S. Watson ssp. pauciflorum
- Fewflower Meadow-rue - Thalictrum Sparsiflorum Turcz. ex Fisch. & C.A. Mey.
- Fewflower Meadow-rue - Thalictrum Sparsiflorum Turcz. ex Fisch. & C.A. Mey. var. saximontanum B. Boivin
- Fewflower Milkweed - Asclepias Lanceolata Walter
- Fewflower Navarretia - Navarretia Leucocephala Benth. ssp. pauciflora (H. Mason) Day
- Fewflower Nutrush - Scleria Pauciflora Muhl. ex Willd.
- Fewflower Nutrush - Scleria Pauciflora Muhl. ex Willd. var. pauciflora
- Fewflower Pea - Lathyrus Pauciflorus Fernald
- Fewflower Pea - Lathyrus Pauciflorus Fernald var. pauciflorus
- Fewflower Sedge - Carex Pauciflora Lightf.
- Fewflower Spikerush - Eleocharis Quinqueflora (Hartmann) O. Schwarz
- Fewflower St. Johnswort - Hypericum Pauciflorum Kunth
- Fewflower Ticktrefoil - Desmodium Pauciflorum (Nutt.) DC.
- Fewflowered Spikerush - Eleocharis Oligantha Clarke
- Fewflowered Yelloweyed Grass - Xyris Pauciflora Willd.
- Fewleaf Spiderflower - Cleome Sparsifolia S. Watson
- Fewleaf Sunflower - Helianthus Occidentalis Riddell
- Fewleaf Sunflower - Helianthus Occidentalis Riddell ssp. occidentalis
- Fewleaf Sunflower - Helianthus Occidentalis Riddell ssp. plantagineus (Torr. & A. Gray) Shinners
- Fewleaf Thistle - Cirsium Remotifolium (Hook.) DC.
- Fewnerved Cottongrass - Eriophorum Tenellum Nutt.
- Fewseed Draba - Draba Oligosperma Hook.
- Fewseed Sedge - Carex Oligosperma Michx.
- Fewseed Sedge - Carex Oligosperma Michx. var. oligosperma
- Fewseeded Bog Sedge - Carex Microglochin Wahlenb.
- Fibraurea - Fibraurea Lour.
- Fibraurea - Fibraurea Tinctoria Lour.
- Fibrousroot Sedge - Carex Communis L.H. Bailey
- Fibrousroot Sedge - Carex Communis L.H. Bailey var. communis
- Ficaria Verna Huds.
- Ficus Brevifolia Nutt.
- Ficus Caribaea Jacq., nom. utique rej.
- Ficus Crassinervia Desf. ex Willd.
- Ficus Glomerata Roxb.
- Ficus Laevigata Vahl
- Ficus Microcarpa L. f. var. latifolia (Miq.) Corner
- Ficus Microcarpa L. f. var. microcarpa
- Ficus Microcarpa Vahl.
- Ficus Nekhudu Warb.
- Ficus Nitida Thunb.
- Ficus Perforata L.
- Ficus Pseudocarica Miq.
- Ficus Repens Rottler
- Ficus Retusa auct.
- Ficus Saffordii Merr.
- Ficus Sintenisii Warb.
- Ficus Urbaniana Warb.
- Fiddle Dock - Rumex Pulcher L.
- Fiddleleaf Fig - Ficus Lyrata Warb.
- Fiddleleaf Hawksbeard - Crepis Runcinata (James) Torr. & A. Gray
- Fiddleleaf Hawksbeard - Crepis Runcinata (James) Torr. & A. Gray ssp. glauca (Nutt.) Babc. & Stebbins
- Fiddleleaf Hawksbeard - Crepis Runcinata (James) Torr. & A. Gray ssp. hispidulosa (Howell ex Rydb.) Babc.
- Fiddleleaf Hawksbeard - Crepis Runcinata (James) Torr. & A. Gray ssp. imbricata Babc. & Stebbins
- Fiddleleaf Hawksbeard - Crepis Runcinata (James) Torr. & A. Gray ssp. runcinata
- Fiddleleaf - Nama L.
- Fiddleleaf Tobacco - Nicotiana Repanda Willd. ex Lehm.
- Fiddleneck - Amsinckia Lehm.
- Fiddlewood - Citharexylum L.
- Fiddlewood - Citharexylum ×perkinsii Moldenke
- Field Anoda - Anoda Pentaschista A. Gray
- Field Bindweed - Convolvulus Arvensis L.
- Field Blackberry - Rubus Arvensis L.H. Bailey
- Field Brome - Bromus Arvensis L.
- Field Burrweed - Soliva Sessilis Ruiz & Pav.
- Field Chickweed - Cerastium Arvense L.
- Field Chickweed - Cerastium Arvense L. ssp. arvense
- Field Chickweed - Cerastium Arvense L. ssp. fuegianum (Hook. f.) Ugborogho
- Field Chickweed - Cerastium Arvense L. ssp. maximum (Hollick & Britton) Ugborogho
- Field Chickweed - Cerastium Arvense L. ssp. strictum (L.) Ugborogho
- Field Chickweed - Cerastium Arvense L. ssp. velutinum (Raf.) Ugborogho
- Field Chickweed - Cerastium Arvense L. ssp. velutinum (Raf.) Ugborogho var. velutinum (Raf.) Britton
- Field Chickweed - Cerastium Arvense L. ssp. velutinum (Raf.) Ugborogho var. villosum (Muhl. ex Darl.
- Field Clover - Trifolium Campestre Schreb.
- Field Copperleaf - Acalypha Arvensis Poepp.
- Field Cottonrose - Logfia Arvensis (L.) Holub
- Field Dock - Rumex Pseudonatronatus Borbás
- Field Eryngo - Eryngium Campestre L.
- Field Fescue - Festuca Arvernensis Auquier, Kerguélen & Markgr.-Dannenb.
- Field Forget-me-not - Myosotis Arvensis (L.) Hill
- Field Garlic - Allium Oleraceum L.
- Field Goldeneye - Viguiera Phenax S.F. Blake
- Field Groundcherry - Physalis Mollis Nutt.
- Field Groundcherry - Physalis Mollis Nutt. var. mollis
- Field Groundcherry - Physalis Mollis Nutt. var. variovestita (Waterf.) J.R. Sullivan
- Field Horsetail - Equisetum Arvense L.
- Field Indian Paintbrush - Castilleja Arvensis Cham. & Schltdl.
- Field Locoweed - Oxytropis Campestris (L.) DC.
- Field Locoweed - Oxytropis Campestris (L.) DC. var. chartacea (Fassett) Barneby
- Field Locoweed - Oxytropis Campestris (L.) DC. var. columbiana (H. St. John) Barneby
- Field Locoweed - Oxytropis Campestris (L.) DC. var. dispar (A. Nelson) Barneby
- Field Locoweed - Oxytropis Campestris (L.) DC. var. minor (Hook.) S.L. Welsh
- Field Locoweed - Oxytropis Campestris (L.) DC. var. spicata Hook.
- Field Locoweed - Oxytropis Campestris (L.) DC. var. varians (Rydb.) Barneby
- Field Locoweed - Oxytropis Campestris (L.) DC. var. wanapum E. Joyal
- Field Lovegrass - Eragrostis Elliottii S. Watson
- Field Marigold - Calendula Arvensis L.
- Field Mousetail - Ivesia Campestris (M.E. Jones) Rydb.
- Field Mustard - Brassica Rapa L.
- Field Mustard - Brassica Rapa L. var. amplexicaulis Tanaka & Ono
- Field Mustard - Brassica Rapa L. var. rapa
- Field Needleleaf - Polycnemum Arvense L.
- Field Pansy - Viola Bicolor Pursh
- Field Parsley Piert - Aphanes Arvensis L.
- Field Paspalum - Paspalum Laeve Michx.
- Field Pennycress - Thlaspi Arvense L.
- Field Pepperweed - Lepidium Campestre (L.) W.T. Aiton
- Field Pumpkin - Cucurbita Pepo L.
- Field Pumpkin - Cucurbita Pepo L. var. medullosa Alef.
- Field Pumpkin - Cucurbita Pepo L. var. ovifera (L.) Harz
- Field Pumpkin - Cucurbita Pepo L. var. pepo
- Field Pussytoes - Antennaria Neglecta Greene
- Field Restharrow - Ononis Arvensis L.
- Field Rose - Rosa Arvensis Huds.
- Field Sagewort - Artemisia Campestris L.
- Field Sagewort - Artemisia Campestris L. ssp. borealis (Pall.) H.M. Hall & Clem.
- Field Sagewort - Artemisia Campestris L. ssp. borealis (Pall.) H.M. Hall & Clem. var. borealis (Pall.)
- Field Sagewort - Artemisia Campestris L. ssp. borealis (Pall.) H.M. Hall & Clem. var. petiolata S.L. W
- Field Sagewort - Artemisia Campestris L. ssp. borealis (Pall.) H.M. Hall & Clem. var. scouleriana (Hoo
- Field Sagewort - Artemisia Campestris L. ssp. borealis (Pall.) H.M. Hall & Clem. var. wormskioldii (Be
- Field Sagewort - Artemisia Campestris L. ssp. campestris L. [excluded]
- Field Sagewort - Artemisia Campestris L. ssp. caudata (Michx.) H.M. Hall & Clem.
- Field Scabiosa - Knautia Arvensis (L.) J.M. Coult.
- Field Smartweed - Polygonum Segetum Kunth
- Field Sowthistle - Sonchus Arvensis L.
- Field Sowthistle - Sonchus Arvensis L. ssp. arvensis
- Field Thistle - Cirsium Discolor (Muhl. ex Willd.) Spreng.
- Field Woodrush - Luzula Campestris (L.) DC.
- Fieldbriar - Rosa Agrestis Savi
- Fierce Spaniard - Aciphylla Ferox W.R.B. Oliv.
- Fierce Spaniard - Aciphylla J.r. Forst. & G. Forst.
- Fiestaflower - Pholistoma Lilja
- Fig Buttercup - Ranunculus Ficaria L.
- Fig Buttercup - Ranunculus Ficaria L. var. bulbifera Marsden-Jones
- Fig - Ficus Godeffroyi Warb.
- Fig - Ficus L.
- Fig - Ficus Prolixa G. Forst.
- Fig - Ficus Thonningii Blume
- Fig - Ficus Tinctoria G. Forst.
- Figleaf Goosefoot - Chenopodium Ficifolium Sm.
- Figleaf Gourd - Cucurbita Ficifolia Bouché
- Figwort - Scrophularia L.
- Fiji Cinnamon - Cinnamomum Pedatinervium Meisn.
- Fiji Hypolytrum - Hypolytrum Nemorum (Vahl) Spreng. ssp. vitiense (C.B. Clarke) T. Koyama
- Fijian Sawsedge - Gahnia Vitiensis Rendle
- Filaginella Palustris (Nutt.) Holub
- Filaginella Uliginosa (L.) Opiz
- Filaginopsis Drummondii Torr. & A. Gray
- Filaginopsis Multicaulis (DC.) Torr. & A. Gray
- Filago Arizonica A. Gray
- Filago Arvensis L.
- Filago Californica Nutt.
- Filago Candida (Torr. & A. Gray) Shinners
- Filago Depressa A. Gray
- Filago Gallica L.
- Filago Germanica Huds.
- Filago Germanica L. 1763, non Huds. 1762, nom. illeg.
- Filago Minima (Sm.) Pers.
- Filago Nivea Small
- Filago Nuttallii Shinners
- Filago Prolifera (Nutt. ex DC.) Britton, non Pomel
- Filago Pyramidata L. var. pyramidata
- Filago Verna (Raf.) Shinners
- Filago Verna (Raf.) Shinners var. drummondii (Torr. & A. Gray) Shinners
- Filicium Decipens (Wight & Arn.) Thwaites , database artifact
- Filifolium Kitam.
- Filifolium Sibiricum (L.) Kitam.
- Filiform Anomobryum Moss - Anomobryum Filiforme (Dicks.) Solms
- Filiform Cryphaea Moss - Cryphaea Filiformis (Hedw.) Brid.
- Filiform Hypnum Moss - Hypnum Cupressiforme Hedw. var. filiforme Brid.
- Filiform Rockjasmine - Androsace Filiformis Retz.
- Filipendula Denudata (J. Presl & C. Presl) Rydb.
- Filipendula Hexapetala Gilib. ex Maxim.
- Filipendula Ulmaria (L.) Maxim. var. denudata (J. Presl & C. Presl) Hayne ex Maxim.
- Filix Bulbifera (L.) Underw.
- Filix Fragilis (L.) Underw.
- Filix Montana (Lam.) Underw.
- Filmy Angelica - Angelica Triquinata Michx.
- Filmy Fern - Hymenophyllum Sm.
- Filmy Kihifern - Adenophorus Hymenophylloides (Kaulf.) Hook. & Grev.
- Fimbristylis Alamosana Fernald
- Fimbristylis Anomala Boeckeler
- Fimbristylis Atollensis H. St. John
- Fimbristylis Autumnalis (L.) Roem. & Schult. var. mucronulata (Michx.) Fernald
- Fimbristylis Autumnalis (L.) Roem. & Schult. var. tainanensis (Ohwi) T. Koyama
- Fimbristylis Baldwiniana (Schult.) Torr.
- Fimbristylis Boninensis Hayata
- Fimbristylis Capillaris (L.) A. Gray
- Fimbristylis Castanea (Michx.) Vahl var. puberula (Michx.) Britton
- Fimbristylis Curassavica (Britton) Alain
- Fimbristylis Cymosa R. Br. ssp. spathacea (Roth) T. Koyama
- Fimbristylis Diphylla (Retz.) Vahl
- Fimbristylis Drummondii (Torr. & Hook. ex Torr.) Boeckeler
- Fimbristylis Geminata (Nees) Kunth
- Fimbristylis Harperi Britton
- Fimbristylis Harrisii (Britton) J.E. Adams [excluded]
- Fimbristylis Interior Britton
- Fimbristylis Juncoides (Vahl) Alain
- Fimbristylis Laxa Vahl
- Fimbristylis Microcarya F. Muell.
- Fimbristylis Miliacea (L.) Vahl, nom. utique rej.
- Fimbristylis Miliacea auct. non (L.) Vahl
- Fimbristylis Monostachya (L.) Hassk.
- Fimbristylis Ovata (Burm. f.) J. Kern
- Fimbristylis Pilosa Vahl
- Fimbristylis Portoricensis (Britton) Alain
- Fimbristylis Puberula (Michx.) Vahl var. drummondii (Torr. & Hook. ex Torr.) Ward
- Fimbristylis Pycnocephala Hillebr.
- Fimbristylis Spadicea (L.) Vahl
- Fimbristylis Spadicea auct. non (L.) Vahl
- Fimbristylis Spathacea Roth
- Fimbristylis Tainanensis Ohwi
- Fimbristylis Umbellaris (L.) Vahl
- Fimbristylis Vestita (Kunth) Hemsl.
- Fimbry - Fimbristylis Littoralis Gaudich.
- Fimbry - Fimbristylis Pauciflora R. Br.
- Fimbry - Fimbristylis Tristachya R. Br.
- Fimbry - Fimbristylis Vahl
- Finebranched Popcornflower - Plagiobothrys Leptocladus (Greene) I.M. Johnst.
- Fineflower Gilia - Gilia Leptantha Parish
- Fineflower Gilia - Gilia Leptantha Parish ssp. leptantha
- Fineflower Gilia - Gilia Leptantha Parish ssp. pinetorum A.D. Grant & V.E. Grant
- Fineflower Gilia - Gilia Leptantha Parish ssp. purpusii (Milliken) A.D. Grant & V.E. Grant
- Fineflower Gilia - Gilia Leptantha Parish ssp. transversa A.D. Grant & V.E. Grant
- Finehair Hymenopappus - Hymenopappus Filifolius Hook. var. tomentosus (Rydb.) B.L. Turner
- Fineleaf Fournerved Daisy - Tetraneuris Linearifolia (Hook.) Greene
- Fineleaf Fournerved Daisy - Tetraneuris Linearifolia (Hook.) Greene var. arenicola Bierner
- Fineleaf Fournerved Daisy - Tetraneuris Linearifolia (Hook.) Greene var. linearifolia
- Fineleaf Fumitory - Fumaria Parviflora Lam.
- Fineleaf Hymenopappus - Hymenopappus Filifolius Hook.
- Fineleaf Hymenopappus - Hymenopappus Filifolius Hook. var. cinereus (Rydb.) I.M. Johnst.
- Fineleaf Hymenopappus - Hymenopappus Filifolius Hook. var. eriopodus (A. Nelson) B.L. Turner
- Fineleaf Hymenopappus - Hymenopappus Filifolius Hook. var. filifolius
- Fineleaf Hymenopappus - Hymenopappus Filifolius Hook. var. lugens (Greene) Jeps.
- Fineleaf Hymenopappus - Hymenopappus Filifolius Hook. var. luteus (Nutt.) B.L. Turner
- Fineleaf Hymenopappus - Hymenopappus Filifolius Hook. var. megacephalus B.L. Turner
- Fineleaf Hymenopappus - Hymenopappus Filifolius Hook. var. nanus (Rydb.) B.L. Turner
- Fineleaf Hymenopappus - Hymenopappus Filifolius Hook. var. parvulus (Greene) B.L. Turner
- Fineleaf Hymenopappus - Hymenopappus Filifolius Hook. var. pauciflorus (I.M. Johnst.) B.L. Turner
- Fineleaf Noseburn - Tragia Leptophylla (Torr.) I.M. Johnst.
- Fineleaf Pondweed - Stuckenia Filiformis (Pers.) Börner
- Fineleaf Pondweed - Stuckenia Filiformis (Pers.) Börner ssp. alpina (Blytt) Haynes, D.H. Les & M. Kral
- Fineleaf Pondweed - Stuckenia Filiformis (Pers.) Börner ssp. filiformis
- Fineleaf Sheep Fescue - Festuca Filiformis Pourr.
- Fineleaf Waterdropwort - Oenanthe Aquatica (L.) Poir.
- Finestem Needlegrass - Nassella Tenuissima (Trin.) Barkworth
- Finetooth Beardtongue - Penstemon Subserratus Pennell
- Finger Cup Lichen - Cladonia Digitata (L.) Hoffm.
- Finger Dogshade - Cynosciadium Digitatum DC.
- Finger False Dragonhead - Physostegia Digitalis Small
- Finger Flatsedge - Cyperus Digitatus Roxb.
- Finger Millet - Eleusine Coracana (L.) Gaertn.
- Finger Rot - Cnidoscolus Urens (L.) Arthur var. stimulosus (Michx.) Govaerts
- Finger Rush - Juncus Digitatus C.W. Witham & Zika
- Finger Skin Lichen - Leptogium Digitatum (A. Massal.) Zahlbr.
- Finger Speedwell - Veronica Triphyllos L.
- Finger Sprangletop - Leptochloa Digitata (R. Br.) Domin
- Fingergrass - Eustachys Desv.
- Fingerleaf Gourd - Cucurbita Digitata A. Gray
- Fingertips - Dudleya Edulis (Nutt.) Moran
- Fink's Beard Lichen - Usnea Finkii Zahlbr.
- Fink's Wart Lichen - Verrucaria Finkiana Servit
- Finlaysonia - Finlaysonia Maritima (Blume) Backer ex K. Heyne
- Finlaysonia Wall.
- Finmark's Leciophysma Lichen - Leciophysma Finmarkicum Th. Fr.
- Finschia - Finschia Chloroxantha Diels
- Finschia - Finschia Warb.
- Fir - Abies Mill.
- Fir Clubmoss - Huperzia Selago (L.) Bernh. ex Schrank & Mart.
- Fir Clubmoss - Huperzia Selago (L.) Bernh. ex Schrank & Mart. var. densa Trevis.
- Fir Clubmoss - Huperzia Selago (L.) Bernh. ex Schrank & Mart. var. selago
- Fir Dwarf Mistletoe - Arceuthobium Abietinum (Engelm.) Hawksw. & Wiens
- Fir Dwarf Mistletoe - Arceuthobium Abietinum Engelm. ex Munz ssp. abietinum
- Fir Lecidea Lichen - Lecidea Picea Lynge
- Fir Mistletoe - Phoradendron Pauciflorum Torr.
- Fire On The Mountain - Euphorbia Cyathophora Murray
- Fire Pink - Silene Virginica L.
- Fire Pink - Silene Virginica L. var. robusta Strausbaugh & Core
- Fire Pink - Silene Virginica L. var. virginica
- Fire Reedgrass - Calamagrostis Koelerioides Vasey
- Fire Star Orchid - Epidendrum Radicans Pav. ex Lindl.
- Fire Vine - Combretum Paniculatum Vent.
- Fireberry Hawthorn - Crataegus Chrysocarpa Ashe
- Firebush - Croton Lucidus L.
- Firecracker Flower - Dichelostemma Ida-maia (Alph. Wood) Greene
- Firecracker Penstemon - Penstemon Eatonii A. Gray
- Firecracker Penstemon - Penstemon Eatonii A. Gray ssp. eatonii
- Firecracker Penstemon - Penstemon Eatonii A. Gray ssp. exsertus (A. Nelson) D.D. Keck
- Firecracker Penstemon - Penstemon Eatonii A. Gray ssp. undosus (M.E. Jones) D.D. Keck
- Firecrackerbush - Bouvardia Ternifolia (Cav.) Schltdl.
- Fireleaf Leptarrhena - Leptarrhena Pyrolifolia (D. Don) R. Br. ex Ser.
- Fireman - Tragia Volubilis L.
- Firespike - Odontonema Tubiforme (Bertol.) Kuntze
- Firethorn - Pyracantha M. Roem.
- Firethread Sedge - Carex Scopulorum T. Holm var. prionophylla (T. Holm) L.A. Standl.
- Firetree - Morella Faya (Aiton) Wilbur
- Fireweed - Chamerion Angustifolium (L.) Holub
- Fireweed - Chamerion Angustifolium (L.) Holub ssp. angustifolium
- Fireweed - Chamerion Angustifolium (L.) Holub ssp. circumvagum (Mosquin) Hoch
- Fireweed - Chamerion Raf. ex Holub
- Fireweed Groundsel - Senecio Linearifolius A. Rich.
- Fireweed Groundsel - Senecio Linearifolius A. Rich. var. linearifolius
- Firleaf Beardtongue - Penstemon Abietinus Pennell
- Firmiana Platanifolia (L. f.) Schott & Endl.
- Firmleaf Willow - Salix Pseudomyrsinites Andersson
- Fischer Monkshood - Aconitum Fischeri Rchb.
- Fischer's Chickweed - Cerastium Fischerianum Ser.
- Fish Creek Fleabane - Erigeron Piscaticus G.L. Nesom
- Fish Lake Thistle - Cirsium Clavatum (M.E. Jones) Petr.
- Fish Slough Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. piscinensis Barneby
- Fish-grass - Cabomba Palaeformis Fassett
- Fisher Milkvetch - Astragalus Piscator Barneby & S.L. Welsh
- Fisher's Tundragrass - Dupontia Fisheri R. Br.
- Fishgrass - Cabomba Haynesii Wiersema
- Fishhook Cactus - Echinomastus Britton & Rose
- Fishhook Cactus - Sclerocactus Britton & Rose
- Fishlock's Croton - Croton Fishlockii Britton
- Fishpoison - Tephrosia Purpurea (L.) Pers.
- Fishscale Bamboo - Phyllostachys Heteroclada Oliv.
- Fishscale Lichen - Psora Decipiens (Hedwig) Hoffm.
- Fishscale Lichen - Psora Hoffm.
- Fishscale Lichen - Psora Icterica (Mont.) Müll. Arg.
- Fishscale Lichen - Psora Rubiformis (Ach.) Hook.
- Fishscale Lichen - Psora Tenuifolia Timdal
- Fishscale Lichen - Psora Vallesiaca (Schaerer) Timdal
- Fishtail Palm - Caryota L.
- Fishtail Swordfern - Nephrolepis Falcata (Cav.) C. Chr.
- Fissidens Adianthoides Hedw. var. immarginatus Lindb. ex Lesq. & James
- Fissidens Adianthoides Hedw. var. semicristatus Grout
- Fissidens Andersonii Grout
- Fissidens Bryoides Hedw. var. brevifolius (Renauld & Cardot) Wijk & Margad.
- Fissidens Bryoides Hedw. var. incurvus (Starke ex Röhl.) Hüb.
- Fissidens Cristatus Wilson ex Mitt.
- Fissidens Cristatus Wilson ex Mitt. var. winonensis (Renauld & Cardot) Grout
- Fissidens Debilis Schwägr.
- Fissidens Donnellii Austin
- Fissidens Exiguus Sull.
- Fissidens Exiguus Sull. var. falcatulus (Renauld & Cardot) Grout
- Fissidens Falcatulus Renauld & Cardot
- Fissidens Garberi Lesq. & James
- Fissidens Incurvus Starke ex Röhl.
- Fissidens Incurvus Starke ex Röhl. var. brevifolius Renauld & Cardot
- Fissidens Julianus (Savi ex DC.) Schimp.
- Fissidens Kegelianus Müll. Hal.
- Fissidens Limbatus Sull. var. brevifolius Sull.
- Fissidens Limbatus Sull. var. ensiformis (Grout) Grout
- Fissidens Longifolius Brid.
- Fissidens Manateensis Grout
- Fissidens Minutulus Sull.
- Fissidens Moss - Fissidens Adianthoides Hedw.
- Fissidens Moss - Fissidens Aphelotaxifolius Purs.
- Fissidens Moss - Fissidens Closteri Austin
- Fissidens Moss - Fissidens Dubius P. Beauv.
- Fissidens Moss - Fissidens Exilis Hedw.
- Fissidens Moss - Fissidens Fontanus (B. Pyl.) Steud.
- Fissidens Moss - Fissidens Hallianus (Sull. & Lesq.) Mitt.
- Fissidens Moss - Fissidens Hedw.
- Fissidens Moss - Fissidens Hyalinus Wilson & Hook.
- Fissidens Moss - Fissidens Limbatus Sull.
- Fissidens Moss - Fissidens Microcladus Thwaites & Mitt.
- Fissidens Moss - Fissidens Papillosus Sande Lac.
- Fissidens Moss - Fissidens Pauperculus Howe
- Fissidens Moss - Fissidens Pellucidus Hornsch.
- Fissidens Moss - Fissidens Subbasilaris Hedw.
- Fissidens Moss - Fissidens Sublimbatus Grout
- Fissidens Moss - Fissidens Taxifolius Hedw.
- Fissidens Moss - Fissidens Ventricosus Lesq.
- Fissidens Orcuttii Grout
- Fissidens Pusillus (Wilson) Milde
- Fissidens Repandus Wilson
- Fissidens Rufulus auct. Amer.
- Fissidens Subcrenatus Schimp.
- Fissidens Texanus Lesq. & James
- Fissidens Tortilis Hampe & Müll. Hal.
- Fissidens Viridulus (Sw.) Wahlenb.
- Fissidens Viridulus (Sw.) Wahlenb. var. brevifolius (Renauld & Cardot) Grout
- Fissidens Viridulus (Sw.) Wahlenb. var. tamarindifolius (Turner) Grout
- Fissidens Viridulus (Sw.) Wahlenb. var. texanus (Lesq. & James) Grout
- Fissipes Acaulis (Aiton) Small
- Fissipes Hirsuta (Mill.) Farw., nom. utique rej.
- Fissure Dot Lichen - Arthonia Fissurina Nyl.
- Fissurewort - Halimolobos Tausch
- Fistulariella Almquistii (Vain.) Bowler & Rundel
- Fistulariella Geniculata (Hook. f. & Taylor) Bowler & Rundel
- Fistulariella Inflata (Hook. f. & Taylor) Bowler & Rundel
- Fistulariella Minuscula (Nyl.) Bowler & Rundel
- Fistulariella Roesleri (Hochst. ex Schaerer) Bowler & Rundel
- Fistulariella Scoparia (Vain.) Bowler & Rundel
- Fitch's Hedgehog Cactus - Echinocereus Reichenbachii (Terscheck ex Walp.) hort ex Haage ssp. fitchii (Britton & Rose)
- Fitch's Tarweed - Hemizonia Fitchii A. Gray
- Fitchia - Fitchia Hook. f.
- Fitzgerald's Sphagnum - Sphagnum Fitzgeraldii Renauld
- Fitzroya Hook. f. ex Lindl.
- Five Eyes - Chamaesaracha (a. Gray) Benth.
- Five-needle Pine - Pinus Parviflora Siebold & Zucc.
- Five-stamen Tamarisk - Tamarix Chinensis Lour.
- Fiveangle Fimbry - Fimbristylis Quinquangularis (Vahl) Kunth
- Fiveangled Dodder - Cuscuta Pentagona Engelm.
- Fiveangled Dodder - Cuscuta Pentagona Engelm. var. pentagona
- Fivebract Chinchweed - Pectis Filipes Harv. & A. Gray
- Fivebract Chinchweed - Pectis Filipes Harv. & A. Gray var. subnuda Fernald
- Fivefinger Chickensage - Vesicarpa Potentilloides (A. Gray) Rydb. var. nitrophilum (Cronquist) Kartesz
- Fivefinger Chickensage - Vesicarpa Potentilloides (A. Gray) Rydb. var. potentilloides
- Fivefingers - Syngonium Angustatum Schott
- Fiveflower Rockdaisy - Perityle Quinqueflora (Steyerm.) Shinners
- Fivehorn Smotherweed - Bassia Hyssopifolia (Pall.) Kuntz
- Fiveleaf Cinquefoil - Potentilla Nivea L. var. pentaphylla Lehm.
- Fiveleaf Clover - Trifolium Andersonii A. Gray
- Fiveleaf Clover - Trifolium Andersonii A. Gray ssp. andersonii
- Fiveleaf Orchid - Isotria Raf.
- Fiveleaf Yam - Dioscorea Pentaphylla L.
- Fivelobe Cucumber - Cayaponia Quinqueloba (Raf.) Shinners
- Fivelobe St. Johnswort - Hypericum Lobocarpum Gattinger ex J.M. Coult.
- Fiveminute Grass - Tripogon Roem. & Schult.
- Fiveneedle Pricklyleaf - Thymophylla Pentachaeta (DC.) Small
- Fiveneedle Pricklyleaf - Thymophylla Pentachaeta (DC.) Small var. belenidium (DC.) Strother
- Fiveneedle Pricklyleaf - Thymophylla Pentachaeta (DC.) Small var. pentachaeta
- Fiveneedle Pricklyleaf - Thymophylla Pentachaeta (DC.) Small var. puberula (Rydb.) Strother
- Fivenerve Helianthella - Helianthella Quinquenervis (Hook.) A. Gray
- Fivepetal Cliffbush - Jamesia Americana Torr. & A. Gray
- Fivepetal Cliffbush - Jamesia Americana Torr. & A. Gray var. americana
- Fivepetal Cliffbush - Jamesia Americana Torr. & A. Gray var. macrocalyx (Small) Engl.
- Fivepetal Cliffbush - Jamesia Americana Torr. & A. Gray var. rosea J.A. Purpus ex C.K. Schneid.
- Fivepetal Leaf-flower - Phyllanthus Pentaphyllus C. Wright ex Griseb.
- Fivepetal Leaf-flower - Phyllanthus Pentaphyllus C. Wright ex Griseb. ssp. pentaphyllus
- Fivepetal Leaf-flower - Phyllanthus Pentaphyllus C. Wright ex Griseb. ssp. pentaphyllus var. floridanus G.L. Webs
- Fivepetal Leaf-flower - Phyllanthus Pentaphyllus C. Wright ex Griseb. ssp. polycladus (Urb.) G.L. Webster
- Fivespot - Nemophila Maculata Benth. ex Lindl.
- Fivestamen Burbark - Triumfetta Pentandra A. Rich.
- Fivestamen Chickweed - Cerastium Semidecandrum L.
- Fivestamen Miterwort - Mitella Pentandra Hook.
- Fivetooth Spineflower - Chorizanthe Watsonii Torr. & A. Gray
- Fivewing Spiderling - Boerhavia Intermedia M.E. Jones
- Flaccid Brachythecium Moss - Brachythecium Salebrosum (F. Weber & D. Mohr) Schimp. var. flaccidum Schimp.
- Flaccid Fontinalis Moss - Fontinalis Flaccida Renauld & Cardot
- Flaccidgrass - Pennisetum Flaccidum Griseb.
- Flacourtia Cataphracta Roxb. ex Willd.
- Flacourtia Euphlebia Merr.
- Flacourtia - Flacourtia Comm. ex L'Hér.
- Flacourtia Ramontchi L'Her.
- Flagellaria Indica L.
- Flagellaria L.
- Flagstaff Beardtongue - Penstemon Nudiflorus A. Gray
- Flagstaff Ragwort - Senecio Actinella Greene
- Flagstaff Rockcress - Arabis Gracilipes Greene
- Flaky Juniper - Juniperus Squamata D. Don [excluded]
- Flame Azalea - Rhododendron Calendulaceum (Michx.) Torr.
- Flame Beard Lichen - Usnea Flammea Stirt.
- Flame Bottletree - Brachychiton Acerifolius (A. Cunn. ex G. Don) Macarthur
- Flame Keeper - Combretum Paniculatum Vent. ssp. microphyllum (Klotzsch) Wickens
- Flame Lily - Gloriosa L.
- Flame Lily - Gloriosa Superba L.
- Flame Orchid - Maxillaria Coccinea (Jacq.) L.O. Williams ex Hodge
- Flame Ragwort - Packera Greenei (A. Gray) W.A. Weber & Á. Löve
- Flame Violet - Episcia Cupreata (Hook.) Hanst.
- Flameberry - Urera Caracasana (Jacq.) Gaudich. ex Griseb.
- Flameflower - Macranthera Flammea (W. Bartram) Pennell
- Flameflower - Phemeranthus Raf.
- Flameflower - Talinum Caffrum (Thunb.) Eckl. & Zeyh.
- Flameflower - Talinum Portulacifolium (Forssk.) Asch. ex Schweinf.
- Flamegold - Koelreuteria Elegans (Seem.) A.C. Sm.
- Flamegold - Koelreuteria Elegans (Seem.) A.C. Sm. ssp. formosana (Hayata) F.G. Mey.
- Flamevine - Pyrostegia Venusta (Ker Gawl.) Miers
- Flaming Gorge Evening Primrose - Oenothera Acutissima W.L. Wagner
- Flaming Trumpet - Collomia Rawsoniana Greene
- Flamingo-lily - Anthurium Andraeanum Linden
- Flannelbush - Fremontodendron Coville
- Flat Pea - Lathyrus Sylvestris L.
- Flat-spiked Sedge - Carex Planispicata Naczi
- Flat-top Broomrape - Orobanche Corymbosa (Rydb.) Ferris
- Flat-top Broomrape - Orobanche Corymbosa (Rydb.) Ferris ssp. corymbosa
- Flat-top Broomrape - Orobanche Corymbosa (Rydb.) Ferris ssp. mutabilis Heckard
- Flat-top Buckwheat - Eriogonum Smithii Reveal
- Flat-top Draba - Draba Corymbosa R. Br. ex DC.
- Flat-top Four O'clock - Mirabilis Glabrifolia (Ortega) I.M. Johnst.
- Flat-top Goldentop - Euthamia Graminifolia (L.) Nutt.
- Flat-top Goldentop - Euthamia Graminifolia (L.) Nutt. var. graminifolia
- Flat-top Goldentop - Euthamia Graminifolia (L.) Nutt. var. hirtipes (Fernald) C.E.S. Taylor & R.J. Taylor
- Flat-top Mille Graines - Oldenlandia Corymbosa L.
- Flat-top Pussytoes - Antennaria Corymbosa E.E. Nelson
- Flat-top Whiteweed - Ageratum Corymbosum Zuccagni ex Pers.
- Flat-top Yate - Eucalyptus Occidentalis Endl.
- Flat-topped Timonius - Timonius Corymbosus Valeton
- Flat-topped Timonius - Timonius Corymbosus Valeton var. corymbosus
- Flat-topped Timonius - Timonius Corymbosus Valeton var. takamatsui Fosberg & Sachet
- Flatbud Pricklypoppy - Argemone Munita Durand & Hilg.
- Flatbud Pricklypoppy - Argemone Munita Durand & Hilg. ssp. argentea G.B. Ownbey
- Flatbud Pricklypoppy - Argemone Munita Durand & Hilg. ssp. munita
- Flatbud Pricklypoppy - Argemone Munita Durand & Hilg. ssp. robusta G.B. Ownbey
- Flatbud Pricklypoppy - Argemone Munita Durand & Hilg. ssp. rotundata (Rydb.) G.B. Ownbey
- Flatcrown Buckwheat - Eriogonum Deflexum Torr.
- Flatcrown Buckwheat - Eriogonum Deflexum Torr. var. baratum (Elmer) Reveal
- Flatcrown Buckwheat - Eriogonum Deflexum Torr. var. deflexum
- Flatcrown Buckwheat - Eriogonum Deflexum Torr. var. rectum Reveal
- Flatface Calicoflower - Downingia Pulchella (Lindl.) Torr.
- Flatfork Fern - Psilotum Complanatum Sw.
- Flatfruit Beaksedge - Rhynchospora Compressa Carey ex Chapm.
- Flatglobe Dodder - Cuscuta Umbellata Kunth
- Flatleaf Bladderwort - Utricularia Intermedia Hayne
- Flatleaf Flatsedge - Cyperus Planifolius Rich.
- Flatleaf Hollyfern - Polystichum Platyphyllum (Willd.) C. Presl
- Flatsedge - Cyperus Dioicus I.M. Johnst.
- Flatsedge - Cyperus L.
- Flatsedge - Cyperus Pseudothyrsiflorus (Kük.) R. Carter & S.D. Jones
- Flatsedge - Cyperus Tenerrimus Liebm.
- Flatsedge - Cyperus ×deamii O'Neill (pro sp.)
- Flatseed Sandmat - Chamaesyce Platysperma (Engelm. ex S. Watson) Shinners
- Flatspike Sedge - Abildgaardia Ovata (Burm. f.) Kral
- Flatspine Bur Ragweed - Ambrosia Acanthicarpa Hook.
- Flatspine Stickseed - Lappula Occidentalis (S. Watson) Greene
- Flatspine Stickseed - Lappula Occidentalis (S. Watson) Greene var. cupulata (A. Gray) Higgins
- Flatspine Stickseed - Lappula Occidentalis (S. Watson) Greene var. occidentalis
- Flatstem Pondweed - Potamogeton Zosteriformis Fernald
- Flatstem Spikerush - Eleocharis Compressa Sull.
- Flatstem Spikerush - Eleocharis Compressa Sull. var. compressa
- Flattened Oatgrass - Danthonia Compressa Austin
- Flattened Pipewort - Eriocaulon Compressum Lam.
- Flatwoods St. Johnswort - Hypericum Microsepalum (Torr. & A. Gray) A. Gray ex S. Watson
- Flaveria Latifolia (J.R. Johnst.) Rydb.
- Flaveria Oppositifolia auct. non (DC.) Rydb.
- Flaveria ×latifolia (J.R. Johnst.) Long & Rhamstine, non (J.R. Johnst.) Rydb., nom.
- Flavocetraria Cucullata (Bellardi) Karnefelt & A. Thell
- Flavocetraria Karnefelt & A. Thell
- Flavocetraria Nivalis (L.) Karnefelt & A. Thell
- Flavoparmelia Lichen - Flavoparmelia Caperata (L.) Hale
- Flavoparmelia Lichen - Flavoparmelia Concreta (Stizenb.) ?, ined.?
- Flavoparmelia Lichen - Flavoparmelia Hale
- Flavoparmelia Lichen - Flavoparmelia Rutidota (Hook. f. & Taylor) Hale
- Flavopunctelia Lichen - Flavopunctelia (krog) Hale
- Flavopunctelia Lichen - Flavopunctelia Flaventior (Stirt.) Hale
- Flavopunctelia Lichen - Flavopunctelia Praesignis (Nyl.) Hale
- Flavopunctelia Lichen - Flavopunctelia Soredica (Nyl.) Hale
- Flax Dodder - Cuscuta Epilinum Weihe
- Flax - Linum L.
- Flax - Linum Narbonense L.
- Flaxflowered Ipomopsis - Ipomopsis Longiflora (Torr.) V.E. Grant
- Flaxflowered Ipomopsis - Ipomopsis Longiflora (Torr.) V.E. Grant ssp. longiflora
- Flaxflowered Ipomopsis - Ipomopsis Longiflora (Torr.) V.E. Grant ssp. neomexicana Wilken
- Flaxleaf False Foxglove - Agalinis Linifolia (Nutt.) Britton
- Flaxleaf Fanpetals - Sida Linifolia Cav.
- Flaxleaf Monardella - Monardella Linoides A. Gray
- Flaxleaf Monardella - Monardella Linoides A. Gray ssp. linoides
- Flaxleaf Monardella - Monardella Linoides A. Gray ssp. oblonga (Greene) Abrams
- Flaxleaf Monardella - Monardella Linoides A. Gray ssp. stricta (Parish) Epling
- Flaxleaf Pimpernel - Anagallis Monelli L.
- Flaxleaf Plainsmustard - Schoenocrambe Linifolia (Nutt.) Greene
- Flaxleaf - Thesium Linophyllon L. [excluded]
- Flaxleaf Whitetop Aster - Ionactis Linariifolius (L.) Greene
- Fleabane - Erigeron L.
- Fleabane - Erigeron Oxyodontus Lunell
- Fleabane - Erigeron ×arthurii B. Boivin
- Flemingia - Flemingia Roxb. ex W.T. Aiton
- Fleshcolor Pincushion - Chaenactis Xantiana A. Gray
- Fleshy Beardtongue - Penstemon Carnosus Pennell
- Fleshy Clapdaisy - Clappia Suaedifolia A. Gray
- Fleshy Dandelion - Taraxacum Carneocoloratum A. Nelson
- Fleshy Hawthorn - Crataegus Succulenta Schrad. ex Link
- Fleshy Honeysweet - Tidestromia Carnosa (Steyerm.) I.M. Johnst.
- Fleshy Lupine - Lupinus Affinis J. Agardh
- Fleshy Porterella - Porterella Carnosula (Hook. & Arn.) Torr.
- Fleshy Star Orchid - Epidendrum Boricuarum Hágsater & Sánchez
- Fleshy Starwort - Stellaria Crassifolia Ehrh.
- Fleshy Starwort - Stellaria Crassifolia Ehrh. var. crassifolia
- Fleshy Starwort - Stellaria Crassifolia Ehrh. var. eriocalycina Schischkin
- Fleshy Starwort - Stellaria Crassifolia Ehrh. var. linearis Fenzl
- Fleshyfruit Gladecress - Leavenworthia Crassa Rollins
- Fleshyfruit Gladecress - Leavenworthia Crassa Rollins var. crassa
- Fleshyfruit Gladecress - Leavenworthia Crassa Rollins var. elongata Rollins
- Fleshyleaf Violet Orchid - Ionopsis Satyrioides (Sw.) Rchb. f.
- Flett's Dry Rock Moss - Grimmia Torquata Hornsch. var. flettii (Holz.) Vaar.
- Flett's Fleabane - Erigeron Flettii G.N. Jones
- Flett's Ragwort - Packera Flettii (Wiegand) W.A. Weber & Á. Löve
- Fleurya Aestuans (L.) Gaudich.
- Flexible Ceanothus - Ceanothus ×flexilis Greene ex McMinn
- Flexile Milkvetch - Astragalus Flexuosus Douglas ex G. Don
- Flexile Milkvetch - Astragalus Flexuosus Douglas ex G. Don var. flexuosus
- Flickingeria - Flickingeria A.d. Hawkes
- Flindersia - Flindersia R. Br.
- Flint Mountain Milkvetch - Astragalus Siliceus Barneby
- Floating Antlerfern - Ceratopteris Pteridoides (Hook.) Hieron.
- Floating Balsamo - Psychotria Nutans Sw.
- Floating Bur-reed - Sparganium Fluctuans (Engelm. ex Morong) B.L. Rob.
- Floating Mannagrass - Glyceria Septentrionalis Hitchc.
- Floating Marsh Marigold - Caltha Natans Pall. ex Georgi
- Floating Marshpennywort - Hydrocotyle Ranunculoides L. f.
- Floating Pondweed - Potamogeton Natans L.
- Floating Primrose-willow - Ludwigia Peploides (Kunth) P.H. Raven
- Floating Primrose-willow - Ludwigia Peploides (Kunth) P.H. Raven ssp. glabrescens (Kuntze) P.H. Raven
- Floating Primrose-willow - Ludwigia Peploides (Kunth) P.H. Raven ssp. montevidensis (Spreng.) P.H. Raven
- Floating Primrose-willow - Ludwigia Peploides (Kunth) P.H. Raven ssp. peploides
- Floating Spurge - Phyllanthus Fluitans Benth. ex Müll. Arg.
- Floating Watermoss - Salvinia Natans (L.) All.
- Floatingheart - Nymphoides Hill
- Floatingheart - Nymphoides Humboldtiana (Kunth) Kuntze
- Flodman's Thistle - Cirsium Flodmanii (Rydb.) Arthur
- Floerkea - Floerkea Willd.
- Floerkea Occidentalis Rydb.
- Floerkea Versicolor Greene
- Floerkea's Phascum Moss - Phascum Floerkeanum F. Weber & D. Mohr
- Flor De Conchitas - Centrosema Pubescens Benth.
- Flor De Llanten - Pleurothallis Gelida Lindl.
- Flor De Pasmo - Bletia Patula Graham
- Flor De Pasmo - Bletia Patula Graham var. alba A.D. Hawkes
- Flor De Pasmo - Bletia Patula Graham var. patula
- Flor De San Jose - Senna Atomaria (L.) Irwin & Barneby
- Flor Impia - Pentapetes Phoenicea L.
- Florestina - Florestina Cass.
- Florida Adder's-mouth Orchid - Malaxis Spicata Sw.
- Florida Alicia - Chapmannia Floridana Torr. & A. Gray
- Florida Amaranth - Amaranthus Floridanus (S. Watson) Sauer
- Florida Anisetree - Illicium Floridanum Ellis
- Florida Balm - Dicerandra Densiflora Benth.
- Florida Beaksedge - Rhynchospora Eximia (Nees) Boeckeler
- Florida Beard Lichen - Usnea Florida (L.) F.H. Wigg.
- Florida Beargrass - Nolina Atopocarpa Bartlett
- Florida Bellflower - Campanula Floridana S. Watson ex A. Gray
- Florida Bellwort - Uvularia Floridana Chapm.
- Florida Biatorella Lichen - Biatorella Floridensis H. Magn.
- Florida Bitterbush - Picramnia Pentandra Sw.
- Florida Blazing Star - Liatris Ohlingerae (S.F. Blake) B.L. Rob.
- Florida Bluestem - Andropogon Floridanus Scribn.
- Florida Boxwood - Schaefferia Frutescens Jacq.
- Florida Bully - Sideroxylon Reclinatum Michx.
- Florida Bully - Sideroxylon Reclinatum Michx. ssp. austrofloridense (Whetstone) Kartesz & Gandhi
- Florida Bully - Sideroxylon Reclinatum Michx. ssp. reclinatum
- Florida Bully - Sideroxylon Reclinatum Michx. ssp. rufotomentosum (Small) Kartesz & Gandhi
- Florida Burhead - Echinodorus Floridanus Haynes & Burkhalter
- Florida Cacalia - Arnoglossum Floridanum (A. Gray) H. Rob.
- Florida Calamint - Clinopodium Dentatum (Chapm.) Kuntze
- Florida Cherry Palm - Pseudophoenix Sargentii H. Wendl. ex Sarg.
- Florida Cherry Palm - Pseudophoenix Sargentii H. Wendl. ex Sarg. ssp. saonae (O.F. Cook) Read
- Florida Cherry Palm - Pseudophoenix Sargentii H. Wendl. ex Sarg. ssp. sargentii
- Florida Chinchweed - Pectis Linearifolia Urb.
- Florida Clover Ash - Tetrazygia Bicolor (Mill.) Cogn.
- Florida Cockspur Grass - Echinochloa Paludigena Wiegand
- Florida Crabgrass - Digitaria Floridana Hitchc.
- Florida Cup Lichen - Cladonia Floridana Vain.
- Florida Diamondflowers - Stenaria Nigricans (Lam.) Terrell var. floridana (Standl.) Terrell
- Florida Dot Lichen - Arthonia Floridana Willey
- Florida Dropseed - Sporobolus Floridanus Chapm.
- Florida Dutchman's Pipe - Aristolochia Maxima Jacq.
- Florida Eccremidium Moss - Eccremidium Floridanum H.A. Crum
- Florida False Beardgrass - Chrysopogon Pauciflorus (Chapm.) Benth. ex Vasey
- Florida False Buttonweed - Spermacoce Floridana Urb.
- Florida False Sunflower - Phoebanthus Grandiflorus (Torr. & A. Gray) S.F. Blake
- Florida Feathershank - Schoenocaulon Dubium (Michx.) Small
- Florida Fishpoison Tree - Piscidia Piscipula (L.) Sarg.
- Florida Flatsedge - Cyperus Floridanus Britton
- Florida Gamagrass - Tripsacum Floridanum Porter ex Vasey
- Florida Goldenaster - Chrysopsis Floridana Small
- Florida Grape - Vitis Cinerea (Engelm.) Engelm. ex Millard var. floridana Munson
- Florida Greeneyes - Berlandiera Subacaulis (Nutt.) Nutt.
- Florida Hammock Milkpea - Galactia Striata (Jacq.) Urb.
- Florida Hammock Sandmat - Chamaesyce Ophthalmica (Pers.) Burch
- Florida Hammock Sedge - Carex Vexans F.J. Herm.
- Florida Hartwrightia - Hartwrightia Floridana A. Gray ex S. Watson
- Florida Hawthorn - Crataegus Panda Beadle
- Florida Hedgehyssop - Gratiola Floridana Nutt.
- Florida Hedgenettle - Stachys Floridana Shuttlw. ex Benth.
- Florida Hoarypea - Tephrosia Florida (F.G. Dietr.) C.E. Wood
- Florida Hobblebush - Agarista D. Don ex G. Don
- Florida Hobblebush - Agarista Populifolia (Lam.) W.S. Judd
- Florida Hopbush - Dodonaea Viscosa (L.) Jacq.
- Florida Horsenettle - Solanum Carolinense L. var. floridanum (Shuttlw. ex Dunal) Chapm.
- Florida Ironweed - Vernonia Blodgettii Small
- Florida Jointweed - Polygonella Basiramia (Small) G.L. Nesom & V.M. Bates
- Florida Jujube - Ziziphus Celata W.S. Judd & D.W. Hall
- Florida Keys Blackbead - Pithecellobium Keyense Britton ex Britton & Rose
- Florida Keys Hempvine - Mikania Cordifolia (L. f.) Willd.
- Florida Keys Indian Mallow - Abutilon Hirtum (Lam.) Sweet
- Florida Keys Ladies'-tresses - Mesadenus Lucayanus (Britton) Schltr.
- Florida Keys Noseburn - Tragia Saxicola Small
- Florida Keys Nutrush - Scleria Lithosperma (L.) Sw.
- Florida Keys Sage - Salvia Riparia Kunth
- Florida Keys Seagrass - Halophila Baillonis Asch.
- Florida Keys Sensitive Pea - Chamaecrista Deeringiana Small & Pennell
- Florida Keys Thoroughwort - Koanophyllon Villosum (Sw.) R.M. King & H. Rob.
- Florida Lacefern - Ctenitis Sloanei (Poepp. ex Spreng.) Morton
- Florida Lady's Nightcap - Bonamia Grandiflora (A. Gray) Hallier f.
- Florida Lady's Tresses - Spiranthes Floridana (Wherry) Cory
- Florida Leaf-flower - Phyllanthus Liebmannianus Müll. Arg.
- Florida Leaf-flower - Phyllanthus Liebmannianus Müll. Arg. ssp. platylepis (Small) G.L. Webster
- Florida Lecidea Lichen - Lecidea Floridensis Nyl.
- Florida Little Bluestem - Schizachyrium Rhizomatum (Swallen) Gould
- Florida Lobelia - Lobelia Floridana Chapm.
- Florida Loosestrife - Lythrum Flagellare Shuttlw. ex Chapm.
- Florida Mayten - Maytenus Phyllanthoides Benth.
- Florida Milkpea - Galactia Floridana Torr. & A. Gray
- Florida Milkvetch - Astragalus Obcordatus Elliott
- Florida Milkvine - Matelea Floridana (Vail) Woodson
- Florida Milkweed - Asclepias Feayi Chapm. ex A. Gray
- Florida Mimosa - Mimosa Quadrivalvis L. var. floridana (Chapm.) Barneby
- Florida Mock Orange - Philadelphus Floridus Beadle
- Florida Mountainmint - Pycnanthemum Floridanum E. Grant & Epling
- Florida Mudmidget - Wolffiella Gladiata (Hegelm.) Hegelm.
- Florida Nutmeg - Torreya Taxifolia Arn.
- Florida Orange Lichen - Caloplaca Floridana (Tuck.) S. Tucker
- Florida Orangegrass - Ctenium Floridanum (Hitchc.) Hitchc.
- Florida Orchid - Oncidium Floridanum Ames
- Florida Paspalum - Paspalum Floridanum Michx.
- Florida Pellitory - Parietaria Floridana Nutt.
- Florida Phlox - Phlox Floridana Benth.
- Florida Pimpernel - Anagallis Pumila Sw.
- Florida Pineland Spurge - Euphorbia Inundata Torr. ex Chapm.
- Florida Pineland Spurge - Euphorbia Inundata Torr. ex Chapm. var. inundata
- Florida Pinkroot - Spigelia Loganioides (Torr. & A. Gray ex Endl. & Fenzl) A. DC.
- Florida Poisontree - Metopium P. Br.
- Florida Pondweed - Potamogeton Floridanus Small
- Florida Pore Lichen - Pertusaria Floridana Dibben
- Florida Prairie Clover - Dalea Carthagenensis (Jacq.) J.F. Macbr. var. floridana (Rydb.) Barneby
- Florida Purple Bladderwort - Utricularia Amethystina Salzm. ex A. St.-Hil. & Girard
- Florida Pygmypipes - Monotropsis Reynoldsiae (A. Gray) A. Heller
- Florida Reimar Grass - Reimarochloa Oligostachya (Munro ex Benth.) Hitchc.
- Florida Roseling - Callisia Cordifolia (Sw.) E.S. Anderson & Woodson
- Florida Sandreed - Calamovilfa Curtissii (Vasey) Scribn.
- Florida Sands St. Johnswort - Hypericum Exile P. Adams
- Florida Scrub Bluecurls - Trichostema Suffrutescens Kearney
- Florida Scrub Frostweed - Helianthemum Nashii Britton
- Florida Scrub Roseling - Callisia Ornata (Small) G. Tucker
- Florida Scrub Skullcap - Scutellaria Arenicola Small
- Florida Sedge - Carex Floridana Schwein.
- Florida Shrubverbena - Lantana Depressa Small var. floridana (Moldenke) R.W. Sanders
- Florida Silver Palm - Coccothrinax Argentata (Jacq.) L.H. Bailey
- Florida Skin Lichen - Leptogium Floridanum Sierk
- Florida Skullcap - Scutellaria Floridana Chapm.
- Florida Slash Pine - Pinus Elliottii Engelm. var. densa Little & Dorman
- Florida Speargrass - Piptochaetium Avenacioides (Nash) Valencia & Costas
- Florida Sphagnum - Sphagnum Macrophyllum Brid. var. floridanum Austin
- Florida Spiderlily - Hymenocallis Tridentata Small
- Florida Star Orchid - Epidendrum Floridense Hágsater
- Florida Strangler Fig - Ficus Aurea Nutt.
- Florida Strap Airplant - Catopsis Floribunda L.B. Sm.
- Florida Sunflower - Helianthus Floridanus A. Gray ex Chapm.
- Florida Swampprivet - Forestiera Segregata (Jacq.) Krug & Urb.
- Florida Swampprivet - Forestiera Segregata (Jacq.) Krug & Urb. var. pinetorum (Small) M.C. Johnst.
- Florida Swampprivet - Forestiera Segregata (Jacq.) Krug & Urb. var. segregata
- Florida Tasselflower - Emilia Fosbergii Nicolson
- Florida Thatch Palm - Thrinax Radiata Lodd. ex Schult. & Schult. f.
- Florida Thoroughwort - Eupatorium Anomalum Nash
- Florida Threeawn - Aristida Rhizomophora Swallen
- Florida Tickseed - Coreopsis Floridana E.B. Sm.
- Florida Ticktrefoil - Desmodium Floridanum Chapm.
- Florida Toadwood - Cupania Glabra Sw.
- Florida Trypelthelium Lichen - Trypethelium Floridanum (Zahlbr. ex M. Choisy) R.C. Harris
- Florida Valerian - Valeriana Scandens L.
- Florida Vetch - Vicia Floridana S. Watson
- Florida Water Aster - Symphyotrichum Fontinale (Alexander) G.L. Nesom
- Florida Waternymph - Najas Guadalupensis (Spreng.) Magnus ssp. floridana (Haynes & Wentz) Haynes & C.B. H
- Florida Whitetop - Rhynchospora Floridensis (Britton) H. Pfeiffer
- Florida Wild Indigo - Baptisia Calycosa Canby
- Florida Wild Indigo - Baptisia Calycosa Canby var. calycosa
- Florida Wild Indigo - Baptisia Calycosa Canby var. villosa Canby
- Florida Willow - Salix Floridana Chapm.
- Florida Yam - Dioscorea Floridana Bartlett
- Florida Yellow Bladderwort - Utricularia Floridana Nash
- Florida Yellow Flax - Linum Floridanum (Planch.) Trel.
- Florida Yellow Flax - Linum Floridanum (Planch.) Trel. var. chrysocarpum C.M. Rogers
- Florida Yellow Flax - Linum Floridanum (Planch.) Trel. var. floridanum
- Florida Yellow-eyed-grass - Xyris Floridana (Kral) E.L. Bridges & Orzell
- Florida Yellowcress - Nasturtium Floridanum (Al-Shehbaz & Rollins) Al-Shehbaz & R.A. Price
- Florida Yellowtops - Flaveria Floridana J.R. Johnst.
- Florida Yew - Taxus Floridana Nutt. ex Chapm.
- Florist's Cyclamen - Cyclamen Persicum Mill.
- Florist's Daisy - Chrysanthemum ×morifolium Ramat. (pro sp.)
- Florist's Spiraea - Astilbe Japonica (C. Morren & Decne.) A. Gray
- Florke's Cup Lichen - Cladonia Floerkeana (Fr.) Flörke
- Flotow's Dimple Lichen - Gyalecta Flotowii Körb.
- Flower Axistree - Glycosmis Parviflora (Sims) Little
- Flower Of An Hour - Hibiscus Trionum L.
- Flower Of Stone - Selaginella Lepidophylla (Hook. & Grev.) Spring
- Flower's Orthotrichum Moss - Orthotrichum Flowersii Vitt
- Flowering Almond - Prunus Glandulosa Thunb.
- Flowering Ash - Fraxinus Ornus L.
- Flowering Dogwood - Cornus Florida L.
- Flowering Flax - Linum Grandiflorum Desf.
- Flowering Pixiemoss - Pyxidanthera Barbulata Michx.
- Flowering Plum - Prunus Triloba Lindl.
- Flowering Quince - Chaenomeles Lindl.
- Flowering Quince - Chaenomeles Speciosa (Sweet) Nakai
- Flowering Rush - Butomus Umbellatus L.
- Flowering Spurge - Euphorbia Corollata L.
- Flowers' Beardtongue - Penstemon Flowersii Neese & S.L. Welsh
- Flowers' Candle Snuffer Moss - Encalypta Flowersiana Horton
- Flowers' Rim Lichen - Lecanora Flowersiana H. Magn.
- Flowery Phlox - Phlox Multiflora A. Nelson
- Flowery Phlox - Phlox Multiflora A. Nelson ssp. multiflora
- Flueggea Virosa auct. non (Roxb. ex Willd.) Baill.
- Fluminia Festucacea (Willd.) Hitchc.
- Fluxweed - Trichostema Brachiatum L.
- Fly Beaksedge - Rhynchospora Holoschoenoides (Rich.) Herter
- Fly Honeysuckle - Lonicera ×xylosteoides Tausch
- Fly Marsh Elder - Iva Cheiranthifolia Kunth
- Fly Orchid - Ophrys Insectifera L.
- Flymallow - Cienfuegosia Cav.
- Flynn's 'ohe - Tetraplasandra Flynnii Lowry & K.R. Wood
- Flynn's Pritchardia - Pritchardia Flynnii Lorence & Gemmill
- Flypoison - Amianthium Muscitoxicum (Walter) A. Gray
- Flyr's Brickellbush - Brickellia Cordifolia Elliott
- Flyweed - Bejaria Mutis, orth. cons.
- Flyweed - Bejaria Racemosa Vent.
- Foamflower - Tiarella L.
- Foeniculum Foeniculum (L.) Karst., nom. inval.
- Fogfruit - Phyla Lour.
- Fogfruit - Phyla ×intermedia Moldenke
- Fogg's Goosefoot - Chenopodium Foggii Wahl
- Foldear Lobelia - Lobelia Flaccidifolia Small
- Folded Calicoflower - Downingia Ornatissima Greene
- Folded Calicoflower - Downingia Ornatissima Greene var. eximia (Hoover) McVaugh
- Folded Calicoflower - Downingia Ornatissima Greene var. ornatissima
- Foldedleaf Grass - Diectomis Fastigiata (Sw.) P. Beauv.
- Foldedleaf Grass - Diectomis Kunth
- Foldwing - Dicliptera Juss.
- Foliage Flower - Phyllanthus Angustifolius (Sw.) Sw.
- Follett's Monardella - Monardella Follettii (Jeps.) Jokerst
- Fonio - Digitaria Exilis (Kippist) Stapf [excluded]
- Fontanesia - Fontanesia Labill.
- Fontanesia Fortunei Carrière
- Fontinalis Allenii Cardot
- Fontinalis Antipyretica Hedw. var. mollis (Müll. Hal.) Welch
- Fontinalis Antipyretica Hedw. var. patula (Cardot) Welch
- Fontinalis Biformis Sull.
- Fontinalis Chrysophylla Cardot
- Fontinalis Dalecarlica Schimp. var. macounii Cardot
- Fontinalis Denticulata Kindb.
- Fontinalis Dichelymoides Lindb.
- Fontinalis Disticha Hook. & Wilson
- Fontinalis Duriaei Schimp.
- Fontinalis Howellii Renauld & Cardot
- Fontinalis Kindbergii Renauld & Cardot
- Fontinalis Lescurii Sull.
- Fontinalis Lescurii Sull. var. ramosior Sull.
- Fontinalis Lorenziae (Cardot) Allen
- Fontinalis Moss - Fontinalis Dalecarlica Schimp.
- Fontinalis Moss - Fontinalis Filiformis Sull. & Lesq.
- Fontinalis Moss - Fontinalis Hedw.
- Fontinalis Moss - Fontinalis Hypnoides Hartm.
- Fontinalis Moss - Fontinalis Hypnoides Hartm. var. duriaei (Schimp.) Husn.
- Fontinalis Moss - Fontinalis Hypnoides Hartm. var. hypnoides
- Fontinalis Moss - Fontinalis Sphagnifolia (Müll. Hal.) Wijk & Margad.
- Fontinalis Nitida Lindb. & Arnell
- Fontinalis Novae-angliae Sull. var. delamarei (Renauld & Cardot) Welch
- Fontinalis Novae-angliae Sull. var. heterophylla Cardot
- Fontinalis Novae-angliae Sull. var. latifolia Cardot
- Fontinalis Novae-angliae Sull. var. waghornei (Cardot) Welch
- Fontinalis Patula Cardot
- Fontinalis Subcarinata Cardot
- Fontinalis Sullivantii Lindb. var. microdonta (Renauld) Welch
- Fontinalis Tenella (Cardot) Cardot
- Fool's Parsley - Aethusa Cynapium L.
- Foolproofplant - Billbergia Pyramidalis (Sims) Lindl.
- Football Fruit - Pangium Edule Reinw. ex Blume
- Foothill Arnica - Arnica Fulgens Pursh
- Foothill Beardtongue - Penstemon Heterophyllus Lindl. ssp. australis (Munz & I.M. Johnst.) D.D. Keck
- Foothill Beargrass - Nolina Erumpens (Torr.) S. Watson
- Foothill Bladderpod - Lesquerella Ludoviciana (Nutt.) S. Watson
- Foothill Clover - Trifolium Ciliolatum Benth.
- Foothill Deathcamas - Zigadenus Paniculatus (Nutt.) S. Watson
- Foothill Deervetch - Lotus Humistratus Greene
- Foothill Flatsedge - Cyperus Amabilis Vahl
- Foothill Fleabane - Erigeron Consimilis Cronquist
- Foothill Gilia - Gilia Capitata Sims ssp. mediomontana V.E. Grant
- Foothill Jepsonia - Jepsonia Heterandra Eastw.
- Foothill Larkspur - Delphinium Hesperium A. Gray
- Foothill Larkspur - Delphinium Hesperium A. Gray ssp. cuyamacae (Abrams) F.H. Lewis & Epling
- Foothill Larkspur - Delphinium Hesperium A. Gray ssp. hesperium
- Foothill Larkspur - Delphinium Hesperium A. Gray ssp. pallescens (Ewan) F.H. Lewis & Epling
- Foothill Meadowfoam - Limnanthes Striata Jeps.
- Foothill Milkvetch - Astragalus Tridactylicus A. Gray
- Foothill Needlegrass - Nassella Lepida (Hitchc.) Barkworth
- Foothill Rush - Juncus Trilocularis Zika
- Foothill Sunburst - Pseudobahia Heermannii (Durand) Rydb.
- Foothill Triteleia - Triteleia Lilacinum Greene
- Footsteps Of Spring - Sanicula Arctopoides Hook. & Arn.
- Forage Kochia - Bassia Prostrata (L.) A.J. Scott
- Foraminella Ambigua (Wulfen) S.L.F. Mey.
- Foraminella Hyperopta (Ach.) S.L.F. Mey.
- Foraminella Subambigua (Gyel.) S.L.F. Mey.
- Forbes' Dwarf Polypody - Grammitis Forbesiana W.H. Wagner
- Forbes' Pipturus - Pipturus Forbesii Krajina
- Forbes's Hawthorn - Crataegus Forbesiae Sarg.
- Forbestown Rush - Juncus Cyperoides Laharpe
- Forchhammeria - Forchhammeria Standl.
- Foreign Cloak Fern - Notholaena Aliena Maxon
- Foreign Fountaingrass - Pennisetum Advena Wipff & Veldkamp
- Forest Alsophila - Alsophila Amintae Conant
- Forest Babyboot Orchid - Lepanthes Rubripetala Stimson
- Forest Bedgrass - Ichnanthus Tenuis (J. Presl) Hitchc. & Chase
- Forest Bonnet Orchid - Pleurothallis Aristata Hook.
- Forest Camp Sandwort - Arenaria Macradenia S. Watson ssp. macradenia var. kuschei (Eastw.) Maguire
- Forest Clermontia - Clermontia Kakeana Meyen
- Forest Climbing Bamboo - Arthrostylidium Sarmentosum Pilg.
- Forest Clover - Trifolium Breweri S. Watson
- Forest Colicwood - Myrsine Alyxifolia Hosaka
- Forest Cyrtandra - Cyrtandra Giffardii Rock
- Forest Danafern - Danaea Urbanii Maxon
- Forest Dubautia - Dubautia Knudsenii Hillebr.
- Forest Dubautia - Dubautia Knudsenii Hillebr. ssp. filiformis G.D. Carr
- Forest Dubautia - Dubautia Knudsenii Hillebr. ssp. knudsenii
- Forest Dubautia - Dubautia Knudsenii Hillebr. ssp. nagatae (H. St. John) G.D. Carr
- Forest False Ohelo - Wikstroemia Furcata (Hillebr.) Rock
- Forest Gardenia - Gardenia Brighamii Gardenia brighamii
- Forest Johnnyberry - Miconia Subcorymbosa Britton
- Forest Mirrorplant - Coprosma Foliosa A. Gray
- Forest Naupaka - Scaevola Procera Hillebr.
- Forest Nightshade - Solanum Nudum Kunth ex Dunal
- Forest Peperomia - Peperomia Hirtipetiola C. DC.
- Forest Plume Fern - Sadleria Squarrosa (Gaudich.) T. Moore
- Forest Redgum - Eucalyptus Tereticornis Sm.
- Forest Sandalwood - Santalum Freycinetianum Gaudich.
- Forest Sandalwood - Santalum Freycinetianum Gaudich. var. freycinetianum
- Forest Sandalwood - Santalum Freycinetianum Gaudich. var. pyrularium (A. Gray) Stemmermann
- Forest Sandmat - Chamaesyce Clusiifolia (Hook. & Arn.) Arthur
- Forest Sawsedge - Gahnia Beecheyi H. Mann
- Forest Scurfpea - Rupertia Physodes (Douglas ex Hook.) J. Grimes
- Forest Snakevine - Hyperbaena Domingensis (DC.) Benth.
- Forest Soralpouch Fern - Saccoloma Inaequale (Kunze) Mett.
- Forest Spleenwort - Asplenium Contiguum Kaulf.
- Forest Spleenwort - Asplenium Contiguum Kaulf. var. contiguum
- Forest Spleenwort - Asplenium Contiguum Kaulf. var. hirtulum C. Chr.
- Forest Starviolet - Hedyotis Centranthoides (Hook. & Arn.) Steud.
- Forest Stenogyne - Stenogyne Kamehamehae Wawra
- Forest Tetramolopium - Tetramolopium Consanguineum (A. Gray) Hillebr.
- Forest Tetramolopium - Tetramolopium Consanguineum (A. Gray) Hillebr. ssp. consanguineum
- Forest Tetramolopium - Tetramolopium Consanguineum (A. Gray) Hillebr. ssp. leptophyllum (Sherff) Lowrey
- Forest Tetramolopium - Tetramolopium Consanguineum (A. Gray) Hillebr. ssp. leptophyllum (Sherff) Lowrey var. leptop
- Forest Twigrush - Machaerina Restioides (Sw.) Vahl
- Forest Twinsorus Fern - Diplazium Sylvaticum (Bory) Sw.
- Forest Wild Coffee - Psychotria Mariniana (Cham. & Schltdl.) Fosberg
- Forest-oak - Allocasuarina Torulosa (Aiton) L.A.S. Johnson
- Forestiera Acuminata (Michx.) Poir. var. parviflora A. Gray
- Forestiera Acuminata (Michx.) Poir. var. vestita Palmer
- Forestiera Autumnalis (Michx.) Poir.
- Forestiera Globularis Small
- Forestiera Neomexicana A. Gray
- Forestiera Neomexicana A. Gray var. arizonica A. Gray
- Forestiera Phillyreoides (Benth.) Torr.
- Forestiera Pinetorum Small
- Forestiera Porulosa (Michx.) Poir.
- Forestiera Puberula Eastw.
- Forestiera Pubescens Nutt. ssp. neomexicana (A. Gray) A.E. Murray
- Forestiera Pubescens Nutt. var. neomexicana (A. Gray) A.E. Murray
- Forestiera Sphaerocarpa Torr.
- Forestiera Texana Cory
- Forget-me-not - Myosotis L.
- Forget-me-not Popcornflower - Plagiobothrys Myosotoides (Lehm.) Brand
- Fork-bracted Rosemallow - Hibiscus Bifurcatus Cav.
- Forked Aster - Eurybia Furcata (Burgess) G.L. Nesom
- Forked Bluecurls - Trichostema Dichotomum L.
- Forked Catchfly - Silene Dichotoma Ehrh.
- Forked Chickweed - Cerastium Dichotomum L.
- Forked Cinquefoil - Potentilla Furcata A.E. Porsild
- Forked Curlygrass Fern - Schizaea Dichotoma (L.) Sm. var. dichotoma
- Forked Fanwort - Cabomba Furcata Schult. & Schult. f.
- Forked Fimbry - Fimbristylis Dichotoma (L.) Vahl
- Forked Green Fiddleneck - Amsinckia Vernicosa Hook. & Arn. var. furcata (Suksd.) Hoover
- Forked Hareleaf - Lagophylla Dichotoma Benth.
- Forked Jelly Lichen - Collema Dichotomum (With.) Coppins & J.R. Laundon
- Forked Lineleaf Fern - Antrophyum Cajenense (Desv.) Spreng.
- Forked Nailwort - Paronychia Lindheimeri Engelm. ex A. Gray
- Forked Nailwort - Paronychia Lindheimeri Engelm. ex A. Gray var. lindheimeri
- Forked Nailwort - Paronychia Lindheimeri Engelm. ex A. Gray var. longibracteata Chaudhri
- Forked Nightshade - Solanum Furcatum Dunal ex Poir.
- Forked Pepperweed - Lepidium Oxycarpum Torr. & A. Gray
- Forked Rush - Juncus Dichotomus Elliott
- Forked Spleenwort - Asplenium Septentrionale (L.) Hoffm.
- Forked Spurge - Euphorbia Bifurcata Engelm.
- Forked Threeawn - Aristida Basiramea Engelm. ex Vasey
- Forked Woodrush - Luzula Divaricata S. Watson
- Forked Wormwood - Artemisia Furcata M. Bieb.
- Forked Wormwood - Artemisia Furcata M. Bieb. var. furcata
- Forked Wormwood - Artemisia Furcata M. Bieb. var. heterophylla (Besser) Hultén
- Forkedfern - Dicranopteris Bernh.
- Forkleaf Toothwort - Cardamine Dissecta (Leavenworth) Al-Shehbaz
- Forkvein Polypody - Polypodium Dissimile L.
- Formosa Firethorn - Pyracantha Koidzumii (Hayata) Rehder
- Formosa Lily - Lilium Formosanum A. Wallace
- Forsellesia Arida (M.E. Jones) A. Heller
- Forsellesia Clokeyi Ensign
- Forsellesia Meionandra (Koehne) A. Heller
- Forsellesia Nevadensis (A. Gray) Greene
- Forsellesia Planitierum Ensign
- Forsellesia Pungens (Brandegee) A. Heller
- Forsellesia Pungens (Brandegee) A. Heller var. glabra Ensign
- Forsellesia Spinescens (A. Gray) Greene
- Forsellesia Stipulifera (H. St. John) Ensign
- Forsellesia Texensis Ensign
- Forskohlii - Plectranthus Barbatus Andrews
- Forssellia Minnesotensis (Fink) Fink
- Forsstroemia Moss - Forsstroemia Lindb.
- Forsstroemia Moss - Forsstroemia Producta (Hornsch.) Par.
- Forsstroemia Moss - Forsstroemia Trichomitria (Hedw.) Lindb.
- Forsstroemia Nitida Lindb.
- Forsstroemia Ohioense (Sull.) Lindb.
- Forsstroemia Trichomitria (Hedw.) Lindb. var. floridana (Lindb.) H.A. Crum, Steere & L.E.
- Forsstroemia Trichomitria (Hedw.) Lindb. var. immersa (Sull. & Lesq.) Lindb.
- Forster's Maiden Fern - Thelypteris Forsteri Morton
- Forsteronia - Forsteronia G. Mey.
- Forsteronia Portoricensis Woodson
- Forsythia Europaea Degen & Bald.
- Forsythia - Forsythia Vahl
- Fort Bend Hawthorn - Crataegus Anamesa Sarg.
- Fort Bowie Prairie Clover - Dalea Brachystachya A. Gray
- Fort Huachuca Evening Primrose - Oenothera Platanorum P.H. Raven & Parnell
- Fort Huachuca Vervain - Verbena Gracilis Desf.
- Fort Miller Clarkia - Clarkia Williamsonii (Durand & Hilg.) F.H. Lewis & M.E. Lewis
- Fort Mojave Buckwheat - Eriogonum Ordii S. Watson
- Fort Sheridan Hawthorn - Crataegus Apiomorpha Sarg.
- Fort Wingate Milkvetch - Astragalus Wingatanus S. Watson
- Fortuna Range Suncup - Camissonia Arenaria (A. Nelson) P.H. Raven
- Fortune Meadowsweet - Spiraea Japonica L. f. var. fortunei (Planch.) Rehder
- Fortune`s Osmanthus - Osmanthus ×fortunei Carrière
- Fosberg's Lovegrass - Eragrostis Fosbergii Whitney
- Fosberg's Starviolet - Hedyotis Fosbergii W.L. Wagner & D.R. Herbst
- Fossil Hill Creek Bedstraw - Galium Collomiae J.T. Howell
- Fossombronia Alaskana Steere & Inoue
- Fossombronia Brasiliensis Steph.
- Fossombronia Cristula Austin
- Fossombronia Foveolata Lindb.
- Fossombronia Hispidissima Steph.
- Fossombronia Lamellata Steph.
- Fossombronia Longiseta (Austin) Austin
- Fossombronia Macounii Austin
- Fossombronia Raddi
- Fossombronia Texana Lindb.
- Fossombronia Wondraczekii (Corda) Dumort.
- Fossombronia Zygospora R.M. Schust.
- Foster's Rockdaisy - Perityle Fosteri A. Powell
- Fothergilla Parvifolia Kearney
- Foul Odor Monkeyflower - Mimulus Nanus Hook. & Arn. var. mephiticus (A.L. Grant) D. M. Thomps.
- Fountain Butterflybush - Buddleja Alternifolia Maxim.
- Fountain Fern - Triplophyllum Funestum (Kunze) Holttum
- Fountain Palm - Livistona Chinensis (Jacq.) R. Br. ex Mart.
- Fountain Thistle - Cirsium Fontinale (Greene) Jeps.
- Fountain Thistle - Cirsium Fontinale (Greene) Jeps. var. fontinale
- Fountainbush - Russelia Equisetiformis Schltdl. & Cham.
- Fountaingrass - Pennisetum Rich. ex Pers.
- Fouquieria Splendens Engelm. ssp. splendens
- Four O'clock - Mirabilis L.
- Four O'clock - Mirabilis Melanotricha (Standl.) Spellenb.
- Four-angle Leechbush - Dendropemon Caribaeus Krug & Urb.
- Four-nerve Daisy - Tetraneuris Greene
- Four-stamen Maesa - Maesa Tetrandra (Roxb.) A. DC.
- Four-stamen Tamarisk - Tamarix Tetragyna C. Ehrenb.
- Fourangle Flatsedge - Cyperus Tetragonus Elliott
- Fourangle Melicope - Melicope Quadrangularis (H. St. John & Hume) T.G. Hartley & B.C. Stone
- Fourangle Rose Gentian - Sabatia Quadrangula Wilbur
- Fourflower Yellow Loosestrife - Lysimachia Quadriflora Sims
- Fourleaf Buchenavia - Buchenavia Tetraphylla (Aubl.) Howard
- Fourleaf Maidenhair - Adiantum Tetraphyllum Humb. & Bonpl. ex Willd.
- Fourleaf Manyseed - Polycarpon Tetraphyllum (L.) L.
- Fourleaf Manyseed - Polycarpon Tetraphyllum (L.) L. ssp. alsinifolium (Biv.) P.W. Ball
- Fourleaf Manyseed - Polycarpon Tetraphyllum (L.) L. ssp. tetraphyllum
- Fourleaf Mare's-tail - Hippuris Tetraphylla L. f.
- Fourleaf Milkweed - Asclepias Quadrifolia Jacq.
- Fourleaf Peperomia - Peperomia Quadrifolia (L.) Kunth
- Fourleaf Vetch - Vicia Acutifolia Elliott
- Fourleaf Yam - Dioscorea Quaternata J.F. Gmel.
- Fourpart Dwarf Gentian - Gentianella Propinqua (Richardson) J.M. Gillett
- Fourpart Dwarf Gentian - Gentianella Propinqua (Richardson) J.M. Gillett ssp. aleutica (Cham. & Schltdl.) J.M.
- Fourpart Dwarf Gentian - Gentianella Propinqua (Richardson) J.M. Gillett ssp. propinqua
- Fourpart Horsebrush - Tetradymia Tetrameres (S.F. Blake) Strother
- Fourpart Mistletoe - Phoradendron Tetrapterum Krug & Urb.
- Fourpart Phacelia - Phacelia Tetramera J.T. Howell
- Fourpetal Cliffbush - Jamesia Tetrapetala N.H. Holmgren & P.K. Holmgren
- Fourpetal Pawpaw - Asimina Tetramera Small
- Fourpetal Pussypaws - Cistanthe Quadripetala (S. Watson) Hershkovitz
- Fourpetal St. Johnswort - Hypericum Tetrapetalum Lam.
- Fourpoint Evening Primrose - Oenothera Rhombipetala Nutt. ex Torr. & A. Gray
- Fourspike Fingergrass - Eustachys Neglecta (Nash) Nash
- Fourspike Heliotrope - Heliotropium Procumbens Mill.
- Fourspike Heliotrope - Heliotropium Procumbens Mill. var. depressum (Cham.) Fosberg
- Fourspike Heliotrope - Heliotropium Procumbens Mill. var. procumbens
- Fourstamen Chickweed - Cerastium Diffusum Pers.
- Fourvalve Mimosa - Mimosa Quadrivalvis L.
- Fourvalve Mimosa - Mimosa Quadrivalvis L. var. leptocarpa (DC.) Barneby, nom. inq.
- Fourvalve Mimosa - Mimosa Quadrivalvis L. var. quadrivalvis
- Fourwing Evening Primrose - Oenothera Tetraptera Cav.
- Fourwing Milkvetch - Astragalus Tetrapterus A. Gray
- Fourwing Saltbush - Atriplex Canescens (Pursh) Nutt.
- Fourwing Saltbush - Atriplex Canescens (Pursh) Nutt. var. angustifolia (Torr.) S. Watson
- Fourwing Saltbush - Atriplex Canescens (Pursh) Nutt. var. canescens
- Fourwing Saltbush - Atriplex Canescens (Pursh) Nutt. var. gigantea S.L. Welsh & Stutz
- Fourwing Saltbush - Atriplex Canescens (Pursh) Nutt. var. laciniata Parish
- Fourwing Saltbush - Atriplex Canescens (Pursh) Nutt. var. macilenta Jeps.
- Fowl Bluegrass - Poa Palustris L.
- Fowl Mannagrass - Glyceria Striata (Lam.) Hitchc.
- Fowler's Knotweed - Polygonum Fowleri B.L. Rob.
- Fowler's Knotweed - Polygonum Fowleri B.L. Rob. ssp. fowleri
- Fowler's Knotweed - Polygonum Fowleri B.L. Rob. ssp. hudsonianum (S.J. Wolf & McNeill) Costea & Tardif
- Fowlsfoot - Serjania Diversifolia (Jacq.) Radlk.
- Fox Grape - Vitis Labrusca L.
- Fox Sedge - Carex Vulpinoidea Michx.
- Fox Sedge - Carex Vulpinoidea Michx. var. pycnocephala F.J. Herm.
- Fox Sedge - Carex Vulpinoidea Michx. var. vulpinoidea
- Fox-tail Blackroot - Pterocaulon Alopecuroidies (Lam.) DC.
- Foxglove Beardtongue - Penstemon Digitalis Nutt. ex Sims
- Foxglove - Digitalis L.
- Foxtail - Alopecurus Brachystachus M. Bieb.
- Foxtail - Alopecurus L.
- Foxtail - Alopecurus ×haussknechtianus Asch. & Graebn.
- Foxtail Amaranth - Amaranthus Caudatus L.
- Foxtail Barley - Hordeum Jubatum L.
- Foxtail Barley - Hordeum Jubatum L. ssp. jubatum
- Foxtail Buckwheat - Eriogonum Polypodum Small
- Foxtail Cactus - Escobaria Britton & Rose
- Foxtail Clubmoss - Lycopodiella Alopecuroides (L.) Cranfill
- Foxtail Copperleaf - Acalypha Alopecuroidea Jacq.
- Foxtail Flatsedge - Cyperus Alopecuroides Rottb.
- Foxtail Millet - Setaria Italica (L.) P. Beauv.
- Foxtail Muhly - Muhlenbergia Andina (Nutt.) Hitchc.
- Foxtail Pine - Pinus Balfouriana Balf.
- Foxtail Pine - Pinus Balfouriana Balf. ssp. austrina R.J. Mastrog & J.D. Mastrog.
- Foxtail Pine - Pinus Balfouriana Balf. ssp. balfouriana
- Foxtail Prairie Clover - Dalea Leporina (Aiton) Bullock
- Foxtail Pricklegrass - Crypsis Alopecuroides (Piller & Mitterp.) Schrad.
- Foxtail Restharrow - Ononis Alopecuroides L.
- Foxtail Sedge - Carex Alopecoidea Tuck.
- Foxtail Wheatgrass - ×pseudelymus Barkworth & D.R. Dewey
- Foxtail Wheatgrass - ×pseudelymus Saxicola (Scribn. & J.G. Sm.) Barkworth & D.R. Dewey
- Fragaria Americana (Porter) Britton
- Fragaria Australis (Rydb.) Rydb.
- Fragaria Bracteata A. Heller
- Fragaria Californica Cham. & Schltdl.
- Fragaria Californica Cham. & Schltdl. var. franciscana Rydb.
- Fragaria Canadensis Michx.
- Fragaria Chiloensis (L.) Mill. var. ananassa Weston
- Fragaria Chiloensis (L.) Mill. var. sandwicensis (Decne.) O. Deg. & I. Deg.
- Fragaria Chiloensis (L.) Mill. var. scouleri Hook.
- Fragaria Crinita Rydb.
- Fragaria Cuneifolia Nutt. ex Howell
- Fragaria Glauca (S. Watson) Rydb.
- Fragaria Grandiflora Ehrh.
- Fragaria Grayana Vilm. ex J. Gay
- Fragaria Helleri Holz.
- Fragaria Indica Andrews
- Fragaria Multicipita Fernald
- Fragaria Ovalis (Lehm.) Rydb.
- Fragaria Pauciflora Rydb.
- Fragaria Platypetala Rydb.
- Fragaria Platypetala Rydb. var. sibbaldifolia (Rydb.) Jeps.
- Fragaria Sandwicensis Decne.
- Fragaria Sibbaldifolia Rydb.
- Fragaria Suksdorfii Rydb.
- Fragaria Truncata Rydb.
- Fragaria Vesca L. var. alba (Ehrh.) Rydb.
- Fragaria Vesca L. var. americana Porter
- Fragaria Vesca L. var. bracteata (A. Heller) R.J. Davis
- Fragaria Vesca L. var. crinita (Rydb.) C.L. Hitchc.
- Fragaria Virginiana Duchesne var. australis Rydb.
- Fragaria Virginiana Duchesne var. canadensis (Michx.) Farw.
- Fragaria Virginiana Duchesne var. glauca S. Watson
- Fragaria Virginiana Duchesne var. illinoensis A. Gray
- Fragaria Virginiana Duchesne var. ovalis (Lehm.) R.J. Davis
- Fragaria Virginiana Duchesne var. platypetala (Rydb.) H.M. Hall
- Fragaria Virginiana Duchesne var. terrae-novae (Rydb.) Fernald & Wiegand
- Fragaria ×ananassa (Weston) Duchesne ex Rozier var. cuneifolia (Nutt. ex Howell) St
- Fragaria ×ananassa (Weston) Duchesne ex Rozier var. ×ananassa
- Fragaria ×magna auct. non Thuill. p.p.
- Fragile Ball Lichen - Sphaerophorus Fragilis (L.) Pers.
- Fragile Beard Lichen - Usnea Fragilescens Hav. ex Lynge
- Fragile Campylopus Moss - Campylopus Fragilis (Brid.) Bruch & Schimp.
- Fragile Filmy Fern - Hymenophyllum Fragile (Hedw.) Morton
- Fragile Hawthorn - Crataegus Fragilis Beadle
- Fragile Hempvine - Mikania Fragilis Urb.
- Fragile Leaf Dicranum Moss - Dicranum Fragilifolium Lindb.
- Fragile Maidenhair - Adiantum Fragile Sw.
- Fragile Maidenhair - Adiantum Fragile Sw. var. fragile
- Fragile Maidenhair - Adiantum Fragile Sw. var. rigidulum (Mett. ex Kuhn) Proctor
- Fragile Midsorus Fern - Blechnum Fragile (Liebm.) Morton & Lellinger
- Fragile Oat - Gaudinia Fragilis (L.) P. Beauv.
- Fragile Oat - Gaudinia P. Beauv.
- Fragile Onion - Allium Scilloides Douglas ex S. Watson
- Fragile Pinkfringe - Arthrostemma Fragile Lindl.
- Fragile Polytrichastrum Moss - Polytrichastrum Alpinum (Hedw.) G.L. Sm. var. fragile (Bryhn) Long
- Fragile Pygmydaisy - Pentachaeta Fragilis Brandegee
- Fragile Rockbrake - Cryptogramma Stelleri (S.G. Gmel.) Prantl
- Fragile Sedge - Carex Membranacea Hook.
- Fragile Sheath Sedge - Carex Fracta Mack.
- Fragile Tortella Moss - Tortella Fragilis (Hook. & Wilson) Limpr.
- Fragile Tortula Moss - Tortula Fragilis Taylor
- Fragilegrass - Aegopogon Tenellus (DC.) Trin.
- Fragrant Applecactus - Harrisia Eriophora (N.E. Pfeiffer) Britton
- Fragrant Ash - Fraxinus Cuspidata Torr.
- Fragrant Beaksedge - Rhynchospora Odorata C. Wright ex Griseb.
- Fragrant Bedstraw - Galium Triflorum Michx.
- Fragrant Bugle-lily - Watsonia Marginata (L. f.) Ker Gawl.
- Fragrant Bursera - Bursera Fagaroides (Kunth) Engl.
- Fragrant Bursera - Bursera Fagaroides (Kunth) Engl. var. elongata McVaugh & Rzed.
- Fragrant Bursera - Bursera Fagaroides (Kunth) Engl. var. fagaroides (Kunth) Engl. [excluded]
- Fragrant Buttonsage - Lantana Involucrata L. var. odorata (L.) Moldenke
- Fragrant Clematis - Clematis Flammula L.
- Fragrant Cryptantha - Cryptantha Grahamii I.M. Johnst.
- Fragrant Dracaena - Dracaena Fragrans (L.) Ker Gawl.
- Fragrant Dutchman's Pipe - Aristolochia Odoratissima L.
- Fragrant Eryngo - Eryngium Aromaticum Baldw.
- Fragrant False Garlic - Nothoscordum Borbonicum Kunth
- Fragrant Flatsedge - Cyperus Odoratus L.
- Fragrant Fritillary - Fritillaria Liliacea Lindl.
- Fragrant Heliotrope - Heliotropium Greggii Torr.
- Fragrant Hempvine - Mikania Odoratissima Urb.
- Fragrant Liparis - Liparis Odorata (Willd.) Lindl.
- Fragrant Maidenhair - Adiantum Melanoleucum Willd.
- Fragrant Manjack - Cordia Dichotoma G. Forst.
- Fragrant Mimosa - Mimosa Borealis A. Gray
- Fragrant Orchid - Gymnadenia Conopsea (L.) R. Br.
- Fragrant Pink - Dianthus Fragrans M.F. Adams [excluded]
- Fragrant Plantain Lily - Hosta Plantaginea (Lam.) Asch.
- Fragrant Popcornflower - Plagiobothrys Figuratus (Piper) I.M. Johnst. ex M. Peck
- Fragrant Popcornflower - Plagiobothrys Figuratus (Piper) I.M. Johnst. ex M. Peck ssp. corallicarpus (Piper) K.L.
- Fragrant Popcornflower - Plagiobothrys Figuratus (Piper) I.M. Johnst. ex M. Peck ssp. figuratus
- Fragrant Premna - Premna Odorata Blanco
- Fragrant Sage - Salvia Clevelandii (A. Gray) Greene
- Fragrant Snakeroot - Ageratina Herbacea (A. Gray) R.M. King & H. Rob.
- Fragrant Spikesedge - Kyllinga Odorata Vahl
- Fragrant Sumac - Rhus Aromatica Aiton
- Fragrant Sumac - Rhus Aromatica Aiton var. arenaria (Greene) Fernald
- Fragrant Sumac - Rhus Aromatica Aiton var. aromatica
- Fragrant Sumac - Rhus Aromatica Aiton var. serotina (Greene) Rehder
- Fragrant Swallow-wort - Cynanchum Northropiae (Schltr.) Alain
- Fragrant Wandflower - Sparaxis Fragrans (Jacq.) Ker Gawl.
- Fragrant Wandflower - Sparaxis Fragrans (Jacq.) Ker Gawl. ssp. grandiflora (D. Delar.) Goldbl.
- Fragrant White Sand Verbena - Abronia Elliptica A. Nelson
- Fragrant Woodfern - Dryopteris Fragrans (L.) Schott
- Franciscan Bluebells - Mertensia Franciscana A. Heller
- Franciscan Erigeron - Erigeron Foliosus Nutt. var. franciscensis G.L. Nesom
- Franciscan Manzanita - Arctostaphylos Hookeri G. Don ssp. franciscana (Eastw.) Munz
- Franciscan Thistle - Cirsium Andrewsii (A. Gray) Jeps.
- Frangula Annonifolia (Greene) Grubov
- Frangula Obovata (Kearney & Peebles) G.L. Nesom & Sawyer
- Frank's Sedge - Carex Frankii Kunth
- Frank-smith's Violet - Viola Frank-smithii N.H. Holmgren
- Frankenia Grandifolia Cham. & Schltdl.
- Frankenia Grandifolia Cham. & Schltdl. var. campestris A. Gray
- Frankincense - Boswellia Sacra Flueckiger
- Franklin Spiderlily - Hymenocallis Franklinensis G. Lom. Sm., L.C. Anderson & Flory
- Franklin Tree - Franklinia Alatamaha W. Bartram ex Marshall
- Franklin Tree - Franklinia W. Bartram ex Marshall
- Franklin's Hawthorn - Crataegus Rhodella Ashe
- Franklin's Penstemon - Penstemon Franklinii S.L. Welsh
- Franklin's Phacelia - Phacelia Franklinii (R. Br.) A. Gray
- Franklin's Sandwort - Arenaria Franklinii Douglas ex Hook.
- Franklin's Sandwort - Arenaria Franklinii Douglas ex Hook. var. franklinii
- Frankton Dock - Rumex ×franktonis B. Boivin
- Frankton's Saltbush - Atriplex Glabriuscula Edmondston var. franktonii (Taschereau) S.L. Welsh
- Franseria Acanthicarpa (Hook.) Coville
- Franseria Ambrosioides Cav.
- Franseria Chamissonis Less.
- Franseria Chamissonis Less. ssp. bipinnatisecta (Less.) Wiggins & Stockw.
- Franseria Chamissonis Less. var. bipinnatisecta Less.
- Franseria Chenopodiifolia Benth.
- Franseria Confertiflora (DC.) Rydb.
- Franseria Cordifolia A. Gray
- Franseria Deltoidea Torr.
- Franseria Discolor Nutt.
- Franseria Dumosa A. Gray
- Franseria Eriocentra A. Gray
- Franseria Ilicifolia A. Gray
- Franseria Linearis Rydb.
- Franseria Pumila Nutt.
- Franseria Strigulosa Rydb.
- Franseria Tomentosa (Nutt.) A. Nelson, non A. Gray
- Franseria Tomentosa A. Gray
- Fraser Fir - Abies Fraseri (Pursh) Poir.
- Fraser Meadow Garlic - Allium Canadense L. var. fraseri Ownbey
- Fraser's Cymophyllus - Cymophyllus Fraserianus (Ker Gawl.) Kartesz & Gandhi
- Fraser's Marsh St. Johnswort - Triadenum Fraseri (Spach) Gleason
- Fraser's Photinia - Photinia ×fraseri Dress
- Fraser's Yellow Loosestrife - Lysimachia Fraseri Duby
- Frasera Albicaulis Douglas ex Griseb. ssp. nitida (Benth.) D.M. Post
- Frasera Albomarginata S. Watson var. induta (Tidestr.) Card
- Frasera Albomarginata S. Watson var. purpusii Jeps.
- Frasera Angustifolia (Rydb.) Rydb.
- Frasera Caerulea Mulford
- Frasera Coerulea Mulford, orth. var.
- Frasera Macrophylla Greene
- Frasera Nitida Benth.
- Frasera Nitida Benth. var. albicaulis (Douglas ex Griseb.) Card
- Frasera Officinalis W. Bartram
- Frasera Pahutensis Reveal
- Frasera Speciosa Douglas ex Griseb. var. angustifolia Rydb.
- Frasera Speciosa Douglas ex Griseb. var. stenosepala Rydb.
- Frasera Stenosepala (Rydb.) Rydb.
- Frasera Umpquaensis M. Peck & Applegate
- Frasera Verticillata Raf.
- Frasera Walteri Michx.
- Fraternal Indian Paintbrush - Castilleja Fraterna Greenm.
- Fraxinus Americana L. ssp. texensis (A. Gray) G.N. Mill.
- Fraxinus Americana L. var. biltmoreana (Beadle) J. Wright ex Fernald
- Fraxinus Americana L. var. crassifolia Sarg.
- Fraxinus Americana L. var. curtissii (Vasey) Small
- Fraxinus Americana L. var. juglandifolia (Lam.) Rehder
- Fraxinus Americana L. var. microcarpa A. Gray
- Fraxinus Americana L. var. texensis A. Gray
- Fraxinus Biltmoreana Beadle
- Fraxinus Campestris Britton
- Fraxinus Caroliniana Mill. var. cubensis (Griseb.) Lingelsh.
- Fraxinus Caroliniana Mill. var. oblanceolata (M.A. Curtis) Fernald & B.G. Schub.
- Fraxinus Cuspidata Torr. var. macropetala (Eastw.) Rehder
- Fraxinus Darlingtonii Britton
- Fraxinus Dipetala Hook. & Arn. var. trifoliolata Torr., orth. var.
- Fraxinus Jonesii Lingelsh.
- Fraxinus Lanceolata Borkh.
- Fraxinus Lowellii Sarg.
- Fraxinus Michauxii Britton
- Fraxinus Oregona Nutt.
- Fraxinus Pauciflora Nutt.
- Fraxinus Pennsylvanica Marshall ssp. oregona (Nutt.) G.N. Mill.
- Fraxinus Pennsylvanica Marshall ssp. velutina (Torr.) G.N. Mill.
- Fraxinus Pennsylvanica Marshall var. austinii Fernald
- Fraxinus Pennsylvanica Marshall var. integerrima (Vahl) Fernald
- Fraxinus Pennsylvanica Marshall var. lanceolata (Borkh.) Sarg.
- Fraxinus Pennsylvanica Marshall var. subintegerrima (Vahl) Fernald
- Fraxinus Smallii Britton
- Fraxinus Texensis (A. Gray) Sarg.
- Fraxinus Tomentosa Michx. f.
- Fraxinus Trifoliata (Torr.) F.H. Lewis & Epling, nom. illeg.
- Fraxinus Trifoliolata (Torr.) F.H. Lewis & Epling, orth. var.
- Fraxinus Velutina Torr. var. coriacea (S. Watson) Rehder
- Fraxinus Velutina Torr. var. glabra Rehder
- Fraxinus Velutina Torr. var. toumeyi (Britton) Rehder
- Fraziers Well Buckwheat - Eriogonum Ripleyi J.T. Howell
- Freckled Milkvetch - Astragalus Lentiginosus Douglas ex Hook.
- Freckled Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. ambiguus Barneby
- Freckled Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. antonius Barneby
- Freckled Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. australis Barneby
- Freckled Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. diphysus (A. Gray) M.E. Jones
- Freckled Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. floribundus A. Gray
- Freckled Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. idriensis M.E. Jones
- Freckled Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. ineptus (A. Gray) M.E. Jones
- Freckled Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. latus (M.E. Jones) M.E. Jones
- Freckled Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. lentiginosus
- Freckled Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. micans Barneby
- Freckled Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. nigricalycis M.E. Jones
- Freckled Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. oropedii Barneby
- Freckled Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. palans (M.E. Jones) M.E. Jones
- Freckled Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. semotus Jeps.
- Freckled Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. stramineus (Rydb.) Barneby
- Freckled Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. trumbullensis S.L. Welsh & N.D. Atwood
- Freckled Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. variabilis Barneby
- Freckled Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. vitreus Barneby
- Frederick's Festulolium - ×festulolium Fredericii Cugnac & A. Camus
- Fredonia Buckwheat - Eriogonum Mortonianum Reveal
- Freeman Maple - Acer ×freemanii A.E. Murray
- Freesia Alba (G.L. Mey.) Gumbl.
- Freesia - Freesia Eckl. ex Klatt
- Freesia Refracta (Jacq.) Eckl. ex Klatt
- Freetip Maiden Fern - Thelypteris Tetragona (Sw.) Small
- Fremon's Bushmallow - Malacothamnus Fremontii (Torr. ex A. Gray) Torr. ex Greene
- Fremont Cottonwood - Populus Fremontii S. Watson
- Fremont Cottonwood - Populus Fremontii S. Watson ssp. fremontii
- Fremont Cottonwood - Populus Fremontii S. Watson ssp. mesetae Eckenwalder
- Fremont County Rockcress - Arabis Pusilla Rollins
- Fremont County Twinpod - Physaria Saximontana Rollins
- Fremont County Twinpod - Physaria Saximontana Rollins var. dentata Rollins
- Fremont County Twinpod - Physaria Saximontana Rollins var. saximontana
- Fremont's Baby Blue Eyes - Nemophila Pulchella Eastw. var. fremontii (Elmer) Constance
- Fremont's Beardtongue - Penstemon Fremontii Torr. & A. Gray ex A. Gray
- Fremont's Beardtongue - Penstemon Fremontii Torr. & A. Gray ex A. Gray var. fremontii
- Fremont's Beardtongue - Penstemon Fremontii Torr. & A. Gray ex A. Gray var. glabrescens Dorn & Lichvar
- Fremont's Birsfoot Trefoil - Lotus Argophyllus (A. Gray) Greene var. fremontii (A. Gray) Ottley
- Fremont's Bladderpod - Lesquerella Fremontii Rollins & Shaw
- Fremont's Chaffbush - Amphipappus Fremontii Torr. & A. Gray ex A. Gray
- Fremont's Chaffbush - Amphipappus Fremontii Torr. & A. Gray ex A. Gray ssp. fremontii
- Fremont's Chaffbush - Amphipappus Fremontii Torr. & A. Gray ex A. Gray ssp. spinosus (A. Nelson) D.D. Keck
- Fremont's Combleaf - Polyctenium Fremontii (S. Watson) Greene var. fremontii
- Fremont's Dalea - Psorothamnus Fremontii (Torr. ex A. Gray) Barneby
- Fremont's Dalea - Psorothamnus Fremontii (Torr. ex A. Gray) Barneby var. attenuatus Barneby
- Fremont's Dalea - Psorothamnus Fremontii (Torr. ex A. Gray) Barneby var. fremontii
- Fremont's Deathcamas - Zigadenus Fremontii (Torr.) Torr. ex S. Watson
- Fremont's Desert-thorn - Lycium Fremontii A. Gray
- Fremont's Evening Primrose - Oenothera Macrocarpa Nutt. ssp. fremontii (S. Watson) W.L. Wagner
- Fremont's Geranium - Geranium Caespitosum James var. fremontii (Torr. ex A. Gray) Dorn
- Fremont's Goldfields - Lasthenia Fremontii (Torr. ex A. Gray) Greene
- Fremont's Goosefoot - Chenopodium Fremontii S. Watson
- Fremont's Goosefoot - Chenopodium Fremontii S. Watson var. fremontii
- Fremont's Horsehair Lichen - Bryoria Fremontii (Tuck.) Brodo & D. Hawksw.
- Fremont's Leather Flower - Clematis Fremontii S. Watson
- Fremont's Mahonia - Mahonia Fremontii (Torr.) Fedde
- Fremont's Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. fremontii (A. Gray ex Torr.) S. Watson
- Fremont's Monkeyflower - Mimulus Fremontii (Benth.) A. Gray
- Fremont's Phacelia - Phacelia Fremontii Torr.
- Fremont's Tidytips - Layia Fremontii (Torr. & A. Gray) A. Gray
- Fremont's Western Rosinweed - Calycadenia Fremontii A. Gray
- Fremont's-gold - Syntrichopappus A. Gray
- Fremontia Californica Torr.
- Fremontia Californica Torr. ssp. crassifolia (Eastw.) Abrams
- Fremontia Californica Torr. ssp. obispoensis (Eastw.) Munz
- Fremontia Californica Torr. var. diegensis M. Harv.
- Fremontia Californica Torr. var. integra M. Harv.
- Fremontia Californica Torr. var. napensis (Eastw.) McMinn
- Fremontia Californica Torr. var. typica M. Harv.
- Fremontia Californica Torr. var. viridis M. Harv.
- Fremontia Crassifolia Eastw.
- Fremontia Mexicana (Davidson) J.F. Macbr.
- Fremontia Napensis Eastw.
- Fremontia Obispoensis Eastw.
- Fremontodendron Californicum (Torr.) Coville ssp. californicum
- Fremontodendron Californicum (Torr.) Coville ssp. crassifolium (Eastw.) J.H. Thomas
- Fremontodendron Californicum (Torr.) Coville ssp. decumbens (R. Lloyd) Munz
- Fremontodendron Californicum (Torr.) Coville ssp. napense (Eastw.) Munz
- Fremontodendron Californicum (Torr.) Coville ssp. obispoense (Eastw.) Munz
- French Broom - Genista Monspessulana (L.) L.A.S. Johnson
- French Flax - Linum Trigynum L.
- French Hybrid Ceanothus - Ceanothus ×delileanus Spach
- French Hydrangea - Hydrangea Macrophylla (Thunb.) Ser.
- French Lavender - Lavandula Stoechas L.
- French Marigold - Tagetes Patula L.
- French Plantain - Musa ×paradisiaca L. (pro sp.)
- French Rose - Rosa Gallica L.
- French Sorrel - Rumex Scutatus L.
- French Tamarisk - Tamarix Gallica L.
- French's Shootingstar - Dodecatheon Frenchii (Vasey) Rydb.
- French-grass - Orbexilum Onobrychis (Nutt.) Rydb.
- Frenchman's Bluff Grapefern - Botrychium Gallicomontanum Farrar & Johnson-Groh
- Freshcut - Justicia Pectoralis Jacq.
- Fresno County Bird's Beak - Cordylanthus Tenuis A. Gray ssp. barbatus T.I. Chuang & Heckard
- Fresno Mat - Ceanothus Fresnensis Dudley ex Abrams
- Frey's Beard Lichen - Usnea Freyi Mot.
- Freycinetia - Freycinetia Gaudich.
- Freycinetia - Freycinetia Mariannensis Merrill
- Freycinetia - Freycinetia Ponapensis Martelli
- Freycinetia - Freycinetia Storckii Seem.
- Freycinetia Reineckei Warb.
- Friendship Plant - Pilea Involucrata (Sims) Urb.
- Fries' Cockleshell Lichen - Hypocenomyce Friesii (Ach.) P. James & Gotth. Schneid.
- Fries' Dimple Lichen - Gyalecta Friesii Flotow ex Körb.
- Fries' Pondweed - Potamogeton Friesii Rupr.
- Fries' Pussytoes - Antennaria Friesiana (Trautv.) Ekman
- Fries' Pussytoes - Antennaria Friesiana (Trautv.) Ekman ssp. alaskana (Malte) Hultén
- Fries' Pussytoes - Antennaria Friesiana (Trautv.) Ekman ssp. friesiana
- Fries' Pussytoes - Antennaria Friesiana (Trautv.) Ekman ssp. neoalaskana (A.E. Porsild) Bayer & Stebbins
- Friesodielsia Steenis
- Frightful Sedge - Carex Molestiformis Reznicek & P. Rothr.
- Fringed Amaranth - Amaranthus Fimbriatus (Torr.) Benth. ex S. Watson
- Fringed Amaranth - Amaranthus Venulosus S. Watson
- Fringed Beaksedge - Rhynchospora Ciliaris (Michx.) C. Mohr
- Fringed Black Bindweed - Polygonum Cilinode Michx.
- Fringed Bladderwort - Utricularia Simulans Pilg.
- Fringed Bluestar - Amsonia Ciliata Walter
- Fringed Bluestar - Amsonia Ciliata Walter var. ciliata
- Fringed Bluestar - Amsonia Ciliata Walter var. tenuifolia (Raf.) Woodson
- Fringed Brome - Bromus Ciliatus L.
- Fringed Brome - Bromus Ciliatus L. var. ciliatus
- Fringed Brome - Bromus Ciliatus L. var. richardsonii (Link) B. Boivin
- Fringed Candle Snuffer Moss - Encalypta Ciliata Hedw.
- Fringed Centipede Grass - Eremochloa Ciliaris (L.) Merr.
- Fringed Checkerbloom - Sidalcea Diploscypha (Torr. & A. Gray) A. Gray
- Fringed Cottongrass - Calliscirpus Criniger (A. Gray) C.N. Gilmour, J.R. Starr & Naczi
- Fringed Dodder - Cuscuta Suaveolens Ser.
- Fringed Dropseed - Sporobolus Fimbriatus (Trin.) Nees
- Fringed False Hellebore - Veratrum Fimbriatum A. Gray
- Fringed False Pimpernel - Lindernia Ciliata (Colsmann) Pennell
- Fringed Fescue - Vulpia Ciliata Dumort.
- Fringed Gentian - Gentianopsis Ma
- Fringed Grass Of Parnassus - Parnassia Fimbriata K.D. Koenig
- Fringed Grass Of Parnassus - Parnassia Fimbriata K.D. Koenig var. fimbriata
- Fringed Grass Of Parnassus - Parnassia Fimbriata K.D. Koenig var. hoodiana C.L. Hitchc.
- Fringed Grass Of Parnassus - Parnassia Fimbriata K.D. Koenig var. intermedia (Rydb.) C.L. Hitchc.
- Fringed Knotweed - Polygonum Lacerum Kunth
- Fringed Lichen - Anaptychia Bryorum Poelt
- Fringed Lichen - Anaptychia Körb.
- Fringed Lichen - Anaptychia Palmulata (Michx.) Vain.
- Fringed Lichen - Anaptychia Setifera Rasanen
- Fringed Lichen - Anaptychia Ulotrichoides (Vain.) Vain.
- Fringed Linanthus - Linanthus Dianthiflorus (Benth.) Greene
- Fringed Loosestrife - Lysimachia Ciliata L.
- Fringed Meadowbeauty - Rhexia Petiolata Walter
- Fringed Nutrush - Scleria Ciliata Michx.
- Fringed Nutrush - Scleria Ciliata Michx. var. ciliata
- Fringed Nutrush - Scleria Ciliata Michx. var. glabra (Chapm.) Fairey
- Fringed Onion - Allium Fimbriatum S. Watson
- Fringed Onion - Allium Fimbriatum S. Watson var. fimbriatum
- Fringed Orchid - Platanthera Rich.
- Fringed Orchid - Platanthera ×andrewsii (M. White) Luer
- Fringed Orchid - Platanthera ×apalachicola P.M. Br. & S.L. Stewart
- Fringed Orchid - Platanthera ×bicolor (Raf.) Luer (pro sp.)
- Fringed Orchid - Platanthera ×canbyi (Ames) Luer
- Fringed Orchid - Platanthera ×channellii J.P. Folsom
- Fringed Orchid - Platanthera ×hollandiae P.M. Catling & Brownell
- Fringed Orchid - Platanthera ×osceola P.M. Br. & S.L. Stewart
- Fringed Orchid - Platanthera ×reznicekii P.M. Catling, Brownell & G. Allen
- Fringed Orchid - Platanthera ×vossii Case
- Fringed Passionflower - Passiflora Ciliata Aiton
- Fringed Passionflower - Passiflora Ciliata Aiton var. riparia C. Wright
- Fringed Phacelia - Phacelia Fimbriata Michx.
- Fringed Pinesap - Pleuricospora Fimbriolata A. Gray
- Fringed Pink - Dianthus Superbus L.
- Fringed Redmaids - Calandrinia Ciliata (Ruiz & Pav.) DC.
- Fringed Rockdaisy - Perityle Ciliata (L.H. Dewey) Rydb.
- Fringed Rosemallow - Hibiscus Schizopetalus (Dyer) Hook. f.
- Fringed Rue - Ruta Chalepensis L.
- Fringed Sedge - Carex Crinita Lam.
- Fringed Sedge - Carex Crinita Lam. var. brevicrinis Fernald
- Fringed Sedge - Carex Crinita Lam. var. crinita
- Fringed Signalgrass - Urochloa Ciliatissima (Buckley) R. Webster
- Fringed Sneezeweed - Helenium Drummondii H. Rock
- Fringed Spiderflower - Cleome Rutidosperma DC.
- Fringed Spikemoss - Selaginella Ciliaris (Retz.) Spring
- Fringed Spineflower - Chorizanthe Fimbriata Nutt.
- Fringed Spineflower - Chorizanthe Fimbriata Nutt. var. fimbriata
- Fringed Spineflower - Chorizanthe Fimbriata Nutt. var. laciniata (Torr.) Jeps.
- Fringed Spleenwort - Asplenium Schizophyllum C. Chr.
- Fringed Star Orchid - Epidendrum Ciliare L.
- Fringed Thistle - Cirsium Centaureae (Rydb.) K. Schum.
- Fringed Twinevine - Funastrum Cynanchoides (Decne.) Schltr.
- Fringed Twinevine - Funastrum Cynanchoides (Decne.) Schltr. ssp. cynanchoides
- Fringed Wattle - Acacia Fimbriata A. Cunn. ex G. Don
- Fringed Willowherb - Epilobium Ciliatum Raf.
- Fringed Willowherb - Epilobium Ciliatum Raf. ssp. ciliatum
- Fringed Willowherb - Epilobium Ciliatum Raf. ssp. glandulosum (Lehm.) Hoch & P.H. Raven
- Fringed Willowherb - Epilobium Ciliatum Raf. ssp. watsonii (Barbey) Hoch & P.H. Raven
- Fringed Windmill Grass - Chloris Ciliata Sw.
- Fringed Yellow Star-grass - Hypoxis Juncea Sm.
- Fringed Yelloweyed Grass - Xyris Fimbriata Elliott
- Fringedfern - Lomariopsis Fée
- Fringeleaf Lobelia - Lobelia Fenestralis Cav.
- Fringeleaf Necklacepod - Sophora Stenophylla A. Gray
- Fringeleaf Tickseed - Coreopsis Integrifolia Poir.
- Fringeleaf Wild Petunia - Ruellia Humilis Nutt.
- Fringepetal Kittentails - Synthyris Schizantha Piper
- Fringepod - Thysanocarpus Hook.
- Fringetree - Chionanthus L.
- Frisco Buckwheat - Eriogonum Soredium Reveal
- Frisco Clover - Trifolium Friscanum (S.L. Welsh) S.L. Welsh
- Fritillaria Adamantina M. Peck
- Fritillaria Atropurpurea Nutt. var. falcata Jeps.
- Fritillaria Atropurpurea Nutt. var. pinetorum (Davidson) I.M. Johnst.
- Fritillaria Biflora Lindl. var. biflora
- Fritillaria Biflora Lindl. var. ineziana Jeps.
- Fritillaria Biflora Lindl. var. inflexa Jeps.
- Fritillaria Camschatcensis (L.) Ker Gawl. var. floribunda (Benth.) B. Boivin
- Fritillaria Coccinea (Greene) Greene
- Fritillaria Eximia Eastw.
- Fritillaria Gracillima Smiley
- Fritillaria Hutchinsonii Davidson
- Fritillaria Kamtschatcensis Torr.
- Fritillaria Lanceolata Pursh
- Fritillaria Lanceolata Pursh var. tristulis A.L. Grant
- Fritillaria Liliacea Benth.
- Fritillaria Liliacea Torr.
- Fritillaria Multiflora Kellogg
- Fritillaria Multiscapoidea Kellogg
- Fritillaria Mutica Lindl.
- Fritillaria Mutica Lindl. var. gracilis (S. Watson) Jeps.
- Fritillaria Parviflora Torr.
- Fritillaria Phaeanthera Eastw.
- Fritillaria Purpusii Purdy
- Fritillaria Recurva Benth. var. coccinea Greene
- Fritillaria Roderickii Knight
- Fritillaria Succulenta Elmer
- Fritillary - Fritillaria L.
- Fritz's Zeuxine - Zeuxine Fritzii Schltr.
- Froelich's Dung Moss - Tayloria Froelichiana (Hedw.) Mitt. ex Broth.
- Froelichia Braunii Standl.
- Froelichia Campestris Small
- Frogbit Buttercup - Ranunculus Hydrocharoides A. Gray
- Frogbit Buttercup - Ranunculus Hydrocharoides A. Gray var. hydrocharoides
- Frogbit Buttercup - Ranunculus Hydrocharoides A. Gray var. stolonifer (Hemsl.) L.D. Benson
- Frogwood - Guettarda Krugii Urb.
- Front Range Alumroot - Heuchera Hallii A. Gray
- Front Range Beardtongue - Penstemon Virens Pennell ex Rydb.
- Front Range Milkvetch - Astragalus Sparsiflorus A. Gray
- Front Range Milkvetch - Astragalus Sparsiflorus A. Gray var. majusculus A. Gray
- Front Range Milkvetch - Astragalus Sparsiflorus A. Gray var. sparsiflorus
- Front Range Twinpod - Physaria Bellii G. Mulligan
- Frost Grape - Vitis Vulpina L.
- Frost Grass - Spodiopogon Sibiricus Trin.
- Frost's Dirinaria Lichen - Dirinaria Frostii (Tuck.) Hale & W.L. Culb.
- Frosted Buckwheat - Eriogonum Incanum Torr. & A. Gray
- Frosted Cyrtandra - Cyrtandra Pruinosa H. St. John & Storey
- Frosted Indian Paintbrush - Castilleja Pruinosa Fernald
- Frosted Lichen - Physconia Detersa (Nyl.) Poelt
- Frosted Lichen - Physconia Enteroxantha (Nyl.) Poelt
- Frosted Lichen - Physconia Kurokawae Kashiw.
- Frosted Lichen - Physconia Muscigena (Ach.) Poelt
- Frosted Lichen - Physconia Perisidiosa (Erichsen) Moberg
- Frosted Lichen - Physconia Poelt
- Frosted Mint - Poliomintha Incana (Torr.) A. Gray
- Frosted Orache - Atriplex Laciniata L.
- Froststem Suncup - Camissonia Multijuga (S. Watson) P.H. Raven
- Frostweed - Helianthemum Mill.
- Frosty Wattle - Acacia Pruinosa A. Cunn. ex Benth.
- Fruit Rockcress - Arabis Fructicosa A. Nelson
- Fruitleaf Knotweed - Polygonum Polygaloides Wall. ex Meisn. ssp. confertiflorum (Nutt. ex Piper) J.C. Hickma
- Frullania Appalachiana R.M. Schust.
- Frullania Arietina Taylor
- Frullania Asagrayana Mont.
- Frullania Bolanderi Austin
- Frullania Brittoniae A. Evans
- Frullania Californica (Austin) A. Evans
- Frullania Catalinae A. Evans
- Frullania Chilcootiensis Steph.
- Frullania Cobrensis Gottsche ex Steph.
- Frullania Cucullata Lindenb. & Gottsche
- Frullania Donnellii Austin
- Frullania Eboracensis Gottsche
- Frullania Ericoides (Nees) Nees
- Frullania Franciscana M. Howe
- Frullania Gibbosa Nees
- Frullania Gymnotis Nees & Mont.
- Frullania Hattoriana J.D. Godfrey & G. Godfrey
- Frullania Inflata Gottsche
- Frullania Inflata Gottsche var. communis R.M. Schust.
- Frullania Inflata Gottsche var. inflata
- Frullania Jackii Gottsche
- Frullania Kunzei Lehm. & Lindenb.
- Frullania Kunzei Lehm. & Lindenb. var. kunzei
- Frullania Kunzei Lehm. & Lindenb. var. maritima R.M. Schust.
- Frullania Nisquallensis Sull.
- Frullania Oakesiana Austin
- Frullania Obcordata (Lehm. & Lindenb.) Lehm. & Lindenb.
- Frullania Plana Sull.
- Frullania Raddi
- Frullania Riojaneirensis (Raddi) Spruce
- Frullania Riparia Hampe ex Lehm.
- Frullania Sabaliana R.M. Schust.
- Frullania Selwyniana Pearson
- Frullania Stylifera (R.M. Schust.) R.M. Schust.
- Frullania Taxodiocola R.M. Schust.
- Frullanoides Bahamensis (A. Evans) Slageren
- Frullanoides Corticalis (Lehm. & Lindenb.) Slageren
- Frullanoides Slageren
- Frutidella Caesioatra (Schaerer) Kalb
- Frutidella Kalb
- Frye's Limbella Moss - Limbella Fryei (R.S. Williams) Ochyra
- Fryingpans - Eschscholzia Lobbii Greene
- Fryxellwort - Fryxellia D.m. Bates
- Fuchsia Begonia - Begonia Foliosa Kunth
- Fuchsia Begonia - Begonia Foliosa Kunth var. miniata (Planch.) L.B. Sm. & B.G. Schub.
- Fuchsia Bush - Eremophila Subfloccosa Benth.
- Fuchsia - Fuchsia L.
- Fuchsia Gracilis Lindl.
- Fuchsia Macrostema Ruiz & Pav.
- Fuchsia Magellanica Lam. var. macrostema (Ruiz & Pav.) Munz [excluded]
- Fuchsiaflower Gooseberry - Ribes Speciosum Pursh
- Fuckel's Corticifraga Lichen - Corticifraga Fuckelii (Rehm) D. Hawksw. & R. Sant.
- Fuirena Caerulescens Steud., orth. var.
- Fuirena Ciliata Bush
- Fuirena Hispida Elliott
- Fuirena Robusta Kunth
- Fuirena Squarrosa Michx. var. aristulata Torr.
- Fuirena Squarrosa Michx. var. breviseta Coville
- Fuirena Squarrosa Michx. var. pumila Torr.
- Fuirena Torreyana Beck
- Fulgensia Bracteata (Hoffm.) Rasanen var. alpina (Th. Fr.) Poelt
- Fuller's Hawthorn - Crataegus Fulleriana Sarg.
- Fuller's Honeysuckle - Lonicera Villosa (Michx.) Schult. var. fulleri Fernald
- Fuller's Teasel - Dipsacus Fullonum L.
- Fullstem - Chamaechaenactis Scaposa (Eastw.) Rydb.
- Fullstem - Chamaechaenactis Scaposa (Eastw.) Rydb. var. parva Preece & Turner
- Fullstem - Chamaechaenactis Scaposa (Eastw.) Rydb. var. scaposa
- Fulton Hawthorn - Crataegus Invicta Beadle
- Fulvous Popcornflower - Plagiobothrys Fulvus (Hook. & Arn.) I.M. Johnst.
- Fulvous Popcornflower - Plagiobothrys Fulvus (Hook. & Arn.) I.M. Johnst. var. campestris (Greene) I.M. Johnst
- Fumaria Flavula Raf.
- Fumaria Martinii Clavaud
- Fumaria Officinalis L. var. wirtgenii (W.D.J. Koch) Hausskn.
- Fumaria Officinalis auct. non L.
- Fumewort - Corydalis Dc.
- Fumitory - Fumaria Bastardii Boreau
- Fumitory - Fumaria L.
- Funaria Calcarea Wahlenb.
- Funaria Californica Sull. & Lesq.
- Funaria Hygrometrica Hedw. var. arctica Berggr.
- Funaria Hygrometrica Hedw. var. calvescens (Schwägr.) Mont.
- Funaria Hygrometrica Hedw. var. convoluta (Hampe) Grout
- Funaria Hygrometrica Hedw. var. patula Bruch & Schimp.
- Funaria Hygrometrica Hedw. var. utahensis Grout
- Funaria Mediterranea Lindb.
- Funaria Microstoma Bruch ex Schimp. var. obtusifolia Grout
- Funaria Moss - Funaria Calvescens Schwägr.
- Funaria Moss - Funaria Flavicans Michx.
- Funaria Moss - Funaria Groutiana Fife
- Funaria Moss - Funaria Hedw.
- Funaria Moss - Funaria Hygrometrica Hedw.
- Funaria Moss - Funaria Microstoma Bruch ex Schimp.
- Funaria Muhlenbergii R. Hedw. ex Turner 1804, non Turner 1805 nec Lam. & DC.
- Funaria Muhlenbergii Turner var. lineata Grout
- Funaria Muhlenbergii Turner var. patula (Bruch & Schimp.) Schimp.
- Funaria Orcuttii E.B. Bartram
- Funastrum Angustifolium (Pers.) Liede & Meve
- Funastrum Cynanchoides (Decne.) Schltr. var. hartwegii (Vail) Krings
- Funastrum Cynanchoides (Decne.) Schltr. var. subtruncatum (B.L. Rob. & Fernald) J.F. Ma
- Funastrum Heterophyllum (Engelm. ex Torr.) Standl.
- Funastrum Lineare (Decne.) J.F. Macbr.
- Funck's Hairsedge - Bulbostylis Funckii (Steud.) C.B. Clarke
- Funck's Wart Lichen - Verrucaria Funckii (Spreng.) Zahlbr.
- Funeral Mountain Blue-eyed Grass - Sisyrinchium Funereum E.P. Bicknell
- Funeral Mountain Milkvetch - Astragalus Funereus M.E. Jones
- Funkiella Confusa (Garay) Szlach.
- Funnel Lily - Androstephium Torr.
- Funston's Saxifrage - Saxifraga Bronchialis L. ssp. funstonii (Small) Hultén
- Funtumia - Funtumia Stapf
- Furbish's Lousewort - Pedicularis Furbishiae S. Watson
- Furcraea - Furcraea Vent.
- Furcraea Gigantea Vent.
- Furcraea Macrophylla Baker [excluded]
- Furcraea Stratiotes J.B. Petersen
- Furniss' Pincushionplant - Navarretia Furnissii L.A. Johnson & L.M. Chan
- Furniss's Phacelia - Phacelia Furnissii N.D. Atwood
- Furrowed Wakerobin - Trillium Sulcatum Patrick
- Fuscate Groundsel - Tephroseris Lindstroemii (Ostenf.) Á. Löve & D. Löve
- Fuschia Gum - Eucalyptus Forrestiana Diels
- Fuscidea Arboricola Coppins & Tønsberg
- Fuscidea Intercincta (Nyl.) Poelt
- Fuscidea Lichen - Fuscidea Cyathoides (Ach.) V. Wirth & Vezda
- Fuscidea Lichen - Fuscidea Gyrodes (H. Magn.) ?, ined.?
- Fuscidea Lichen - Fuscidea Kochiana (Hepp) V. Wirth & Vezda
- Fuscidea Lichen - Fuscidea Lowensis (H. Magn.) R. Anderson & Hertel
- Fuscidea Lichen - Fuscidea Mollis (Wahlenb.) V. Wirth & Vezda
- Fuscidea Lichen - Fuscidea Praeruptorum (Du Rietz & H. Magn.) V. Wirth & Vezda
- Fuscidea Lichen - Fuscidea Recensa (Stirt.) Hertel, V. Wirth & Vezda
- Fuscidea Lichen - Fuscidea Subfilamentosa (Zahlbr.) Brako
- Fuscidea Lichen - Fuscidea Subreagens (H. Magn.) Oberholl. & V. Wirth
- Fuscidea Lichen - Fuscidea V. Wirth & Vezda
- Fuscidea Lightfootii (Sm.) Coppins & P. James
- Fuscidea Placidensis (H. Magn.) R.C. Harris
- Fuscidea Pusilla Tønsberg
- Fuscopannaria Ahlneri (P.M. Jørg.) P.M. Jørg.
- Fuscopannaria Laceratula (Hue) P.M. Jørg.
- Fuscopannaria Leucophaea (Vahl) P.M. Jørg.
- Fuscopannaria Leucosticta (Tuck.) P.M. Jørg.
- Fuscopannaria Leucostictoides (Ohlsson) P.M. Jørg.
- Fuscopannaria Maritima (P.M. Jørg.) P.M. Jørg.
- Fuscopannaria Mediterranea (Tav.) P.M. Jørg.
- Fuscopannaria P.m. Jørg.
- Fuscopannaria Praetermissa (Nyl.) P.M. Jørg.
- Fuscopannaria Pulveracea (P.M. Jørg. & Henssen) P.M. Jørg.
- Fuscopannaria Saubinetii (Mont.) P.M. Jørg.
- Fustic - Pictetia Aculeata (Vahl) Urb.
- Fustictree - Maclura Tinctoria (L.) D. Don ex Steud.
- Fuzzy Dewberry - Rubus Velox L.H. Bailey
- Fuzzy Flatsedge - Cyperus Pilosus Vahl
- Fuzzy Maidenhair - Adiantum Tricholepis Fée
- Fuzzy Mock Orange - Philadelphus Tomentosus Royle
- Fuzzy Phacelia - Phacelia Hirsuta Nutt.
- Fuzzy Pride-of-rochester - Deutzia Scabra Thunb.
- Fuzzy Sedge - Carex Hirtissima W. Boott
- Fuzzy Wuzzy Sedge - Carex Hirsutella Mack.
- Fuzzybean - Strophostyles Elliott
- Fuzzyflower Cyrtandra - Cyrtandra Waiolani Wawra
- Fuzzyflower Stenogyne - Stenogyne Sessilis Benth.
- Fuzzyfruit Nightshade - Solanum Candidum Lindl.
- Fuzzyleaf Clover - Trifolium Eriocephalum Nutt. ssp. villiferum (House) J.M. Gillett
- Fuzzystem Phyllostegia - Phyllostegia Wawrana Sherff
- Fuzzytongue Penstemon - Penstemon Eriantherus Pursh
- Fuzzytongue Penstemon - Penstemon Eriantherus Pursh var. argillosus M.E. Jones
- Fuzzytongue Penstemon - Penstemon Eriantherus Pursh var. eriantherus
- Fuzzywuzzy Airplant - Tillandsia Pruinosa Sw.
- Fynbos Aloe - Aloe Succotrina All.
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