VegeWorx Plant Index - Letter G
- Gabilan Mountains Manzanita - Arctostaphylos Gabilanensis V.T. Parker & M.C. Vasey
- Gadellia - Gadellia Schulkina
- Gadsden Hawthorn - Crataegus Rigens Beadle
- Gaertnera Tomentosa (A. Gray) Kuntze
- Gaertneria Acanthicarpa (Hook.) Britton
- Gaertneria Discolor (Nutt.) Kuntze
- Gaertneria Grayi A. Nelson
- Gaertneria Tenuifolia Harv. & A. Gray
- Gaertneria Tomentosa (Nutt.) A. Heller
- Gaga Lipfern - Gaga Pryer, F. W. Li & Windham
- Gagea - Gagea Salisb.
- Gahnia Gahniiformis (Gaudich.) A. Heller
- Gahnia Globosa H. Mann
- Gahnia Kauaiensis Benl
- Gaillardia Arizonica A. Gray var. arizonica
- Gaillardia Arizonica A. Gray var. pringlei (Rydb.) S.F. Blake
- Gaillardia Chrysantha Small
- Gaillardia Drummondii (Hook.) DC.
- Gaillardia Fastigiata Greene
- Gaillardia Gracilis A. Nelson
- Gaillardia Lanceolata Michx.
- Gaillardia Lanceolata Michx. var. fastigiata (Greene) Waterf.
- Gaillardia Lanceolata Michx. var. flavovirens C. Mohr
- Gaillardia Lutea Greene
- Gaillardia Lutea Greene var. winkleri Cory
- Gaillardia Mearnsii Rydb.
- Gaillardia Mexicana auct. non A. Gray
- Gaillardia Neomexicana A. Nelson
- Gaillardia Picta D. Don
- Gaillardia Pringlei Rydb.
- Gaillardia Rigida Small ex Rydb.
- Gaillardia Serotina (Walter) H. Rock
- Gaillardia Trinervata Small
- Gaillardia Villosa Rydb.
- Gairdner's Beardtongue - Penstemon Gairdneri Hook.
- Gairdner's Beardtongue - Penstemon Gairdneri Hook. var. gairdneri
- Gairdner's Beardtongue - Penstemon Gairdneri Hook. var. oreganus A. Gray
- Gairdner's Yampah - Perideridia Gairdneri (Hook. & Arn.) Mathias ssp. gairdneri
- Gaita - Trichilia Pallida Sw.
- Galactia Acapulcensis Rose
- Galactia Brachypoda Torr. & A. Gray
- Galactia Brevipes Small
- Galactia Cubensis Kunth
- Galactia Elliottii Nutt. var. leavenworthii Torr. & A. Gray
- Galactia Fasciculata Vail
- Galactia Floridana Torr. & A. Gray var. longiracemosa Vail
- Galactia Floridana Torr. & A. Gray var. microphylla Chapm.
- Galactia Glabella Michx.
- Galactia Grayi Vail
- Galactia Grisebachii Urb.
- Galactia Joselyniae G.L. Nesom
- Galactia Jussiaeana Kunth
- Galactia Macreei M.A. Curtis
- Galactia Minor Duncan
- Galactia Mississippiensis (Vail) Rydb.
- Galactia Mohlenbrockii R.H. Maxwell
- Galactia Mollis Michx. var. nashii Vail
- Galactia Prostrata Small
- Galactia Spiciformis Torr. & A. Gray
- Galactia Stenophylla Urb., nom. illeg.
- Galactia Volubilis (L.) Britton var. mississippiensis Vail
- Galactic Dot Lichen - Arthonia Galactitella Nyl.
- Galanga - Kaempferia Galanga L.
- Galanthus Elewesii Hook. f., database artifact
- Galarhoeus Arkansanus (Engelm. & A. Gray) Small ex Rydb.
- Galarhoeus Austrinus (Small) Small
- Galarhoeus Commutatus (Engelm. ex A. Gray) Small
- Galarhoeus Commutatus (Engelm. ex A. Gray) Small var. erectus (J.B.S. Norton) Small
- Galarhoeus Cyparissias (L.) Small ex Rydb.
- Galarhoeus Darlingtonii (A. Gray) Small
- Galarhoeus Esula (L.) Rydb.
- Galarhoeus Floridanus (Chapm.) Small
- Galarhoeus Helioscopius (L.) Haw.
- Galarhoeus Inundatus (Torr. ex Chapm.) Small
- Galarhoeus Lathyris (L.) Haw.
- Galarhoeus Lucidus (Waldst. & Kit.) Rydb.
- Galarhoeus Obtusatus (Pursh) Small
- Galarhoeus Peplus (L.) Rydb.
- Galarhoeus Platyphyllos (L.) Small
- Galarhoeus Telephioides (Chapm.) Small
- Galarhoeus Trichotomus (Kunth) Small
- Galatea Bulbosa (Mill.) Britton
- Galatella Cass.
- Galatella Punctata (Waldst. & Kit.) Nees
- Galax Aphylla auct. non L.
- Galax - Galax Sims
- Galbanum - Ferula Gummosa Boiss.
- Gale Of The Wind - Phyllanthus Niruri L.
- Gale Of The Wind - Phyllanthus Niruri L. ssp. lathyroides (Kunth) G.L. Webster
- Gale Of The Wind - Phyllanthus Niruri L. ssp. niruri
- Gale Palustris A. Chev.
- Galeandra Beyrichii auct. non Rchb. f.
- Galearis - Galearis Raf.
- Galega Caribaea Jacq.
- Galega Florida F.G. Dietr.
- Galega Lindblomii (Harms) J.B. Gillett
- Galega Spicata Walter
- Galen Del Monte - Cestrum Laurifolium L'Hér.
- Galenia - Galenia L.
- Galeopsis Ladanum L. var. angustifolia (Ehrh. ex Hoffm.) Wallr.
- Galeopsis Pubescens Besser [excluded]
- Galeopsis Segetum Neck. [excluded]
- Galeopsis Tetrahit L. var. bifida (Boenn.) Lej. & Court.
- Galeopsis Versicolor W. Curtis
- Galeopsis Villosa Huds.
- Galeorchis Spectabilis (L.) Rydb.
- Galinsoga Aristulata E.P. Bicknell
- Galinsoga Bicolorata H. St. John & D. White
- Galinsoga Caracasana (DC.) Sch. Bip.
- Galinsoga Ciliata (Raf.) S.F. Blake
- Galinsoga Ciliata auct. non (Raf.) S.F. Blake
- Galinsoga Parviflora Cav. var. parviflora
- Galinsoga Parviflora Cav. var. semicalva A. Gray
- Galinsoga Semicalva (A. Gray) H. St. John & D. White
- Galinsoga Semicalva (A. Gray) H. St. John & D. White var. percalva S.F. Blake
- Galipea Officinalis Hanc.
- Galisteo Sand Verbena - Abronia Bigelovii Heimerl
- Galium Agreste Wallr. var. echinospermum Wallr.
- Galium Ambiguum W. Wight var. ambiguum
- Galium Ambiguum W. Wight var. siskiyouense Ferris
- Galium Andrewsii A. Gray var. gatense Dempster
- Galium Anglicum Huds.
- Galium Anglicum Huds. var. parvifolium (Gaudich. ex Roem. & Schult.) DC.
- Galium Angustifolium Nutt. ex A. Gray var. bernardinum Hilend & J.T. Howell
- Galium Angustifolium Nutt. ex A. Gray var. diffusum Hilend & J.T. Howell
- Galium Angustifolium Nutt. ex A. Gray var. foliosum Hilend & J.T. Howell
- Galium Angustifolium Nutt. ex A. Gray var. onycense Dempster
- Galium Angustifolium Nutt. ex A. Gray var. pinetorum Munz & I.M. Johnst.
- Galium Angustifolium Nutt. ex A. Gray var. siccatum (W. Wight) Hilend & J.T. Howell
- Galium Angustifolium Nutt. ex A. Gray var. subglabrum Jeps.
- Galium Angustifolium Nutt. ex A. Gray var. typicum Hilend & J.T. Howell
- Galium Aparine L. ssp. spurium (L.) Simonkai
- Galium Aparine L. var. echinospermum (Wallr.) Farw.
- Galium Aparine L. var. intermedium (Merr.) Briq.
- Galium Aparine L. var. minor Hook.
- Galium Aparine L. var. vaillantii (DC.) Koch
- Galium Arcuatum Wiegand
- Galium Arkansanum A. Gray var. pubiflorum E.B. Sm.
- Galium Asperrimum A. Gray
- Galium Asperrimum A. Gray var. asperulum A. Gray
- Galium Asperulum (A. Gray) Rydb.
- Galium Bermudense L.
- Galium Bloomeri A. Gray
- Galium Bloomeri A. Gray var. hirsutum A. Gray
- Galium Boreale L. ssp. septentrionale (Roem. & Schult.) H. Hara
- Galium Boreale L. ssp. septentrionale (Roem. & Schult.) Iltis
- Galium Boreale L. var. hyssopifolium (Hoffm.) DC.
- Galium Boreale L. var. intermedium DC.
- Galium Boreale L. var. linearifolium Rydb.
- Galium Boreale L. var. scabrum DC.
- Galium Boreale L. var. typicum G. Beck
- Galium Boreale sensu Walter, non L.
- Galium Brachiatum Pursh
- Galium Brachiatum sensu Muhl., non Pursh
- Galium Brandegeei A. Gray p.p.
- Galium Californicum Hook. & Arn. var. crebrifolium Nutt.
- Galium Californicum Hook. & Arn. var. miguelense (Greene) Jeps.
- Galium Californicum Hook. & Arn. var. texanum Torr. & A. Gray
- Galium Californicum Hook. & Arn. var. typicum Hilend & J.T. Howell
- Galium Carolinianum F.G. Dietr.
- Galium Catalinense A. Gray var. buxifolium (Greene) Dempster
- Galium Chartaceum W. Wight
- Galium Circaeoides Roem. & Schult.
- Galium Circaezans Michx. var. glabellum Britton
- Galium Circaezans Michx. var. glabrum Britton
- Galium Circaezans Michx. var. lanceolatum (Torr.) Torr. & A. Gray
- Galium Circaezans Michx. var. typicum Fernald
- Galium Claytonii Michx.
- Galium Claytonii Michx. var. subbiflorum (Wiegand) Wiegand
- Galium Coloradoense W. Wight var. scabriusculum (Ehrend.) Dempster & Ehrend.
- Galium Columbianum Rydb.
- Galium Cruciata (L.) Scop.
- Galium Culbertsonii Greene
- Galium Cymosum Wiegand
- Galium Erectum Huds.
- Galium Filifolium (Wiegand) Small
- Galium Filipes Rydb.
- Galium Flaccidum Greene
- Galium Frankliniense Correll
- Galium Gabrielense Munz & I.M. Johnst.
- Galium Grayanum Ehrend. ssp. glabrescens Ehrend.
- Galium Hispidum Pursh
- Galium Hypotrichium A. Gray ssp. scabriusculum Ehrend.
- Galium Hypotrichium A. Gray ssp. utahense Ehrend.
- Galium Hypotrichium A. Gray var. tomentellum (Ehrend.) Dempster
- Galium Hyssopifolium Hoffm.
- Galium Intermedium auct. non Schult.
- Galium Kamtschaticum Steller ex Schult. & Schult. f. var. oreganum (Britton) Piper
- Galium Latifolium Michx. var. hispidifolium Small ex Britton
- Galium Latifolium Michx. var. hispidum Small
- Galium Litigiosum (DC.) Gaudich. var. nanum DC.
- Galium Margaricoccum A. Gray
- Galium Matthewsii A. Gray var. magnifolium Dempster
- Galium Matthewsii A. Gray var. scabridum Jeps.
- Galium Mexicanum Kunth var. asperrimum (A. Gray) Higgins & S.L. Welsh
- Galium Mexicanum Kunth var. asperulum (A. Gray) Dempster
- Galium Miguelense Greene
- Galium Mollugo L. ssp. erectum (Huds.) Briq.
- Galium Mollugo L. var. erectum (Huds.) Domin
- Galium Multiflorum Kellogg ssp. puberulum Piper
- Galium Multiflorum Kellogg var. coloradoense (W. Wight) Cronquist
- Galium Multiflorum Kellogg var. hirsutum (A. Gray) Jeps.
- Galium Multiflorum Kellogg var. parvifolium Parish
- Galium Multiflorum Kellogg var. puberulum (Piper) H. St. John
- Galium Multiflorum Kellogg var. subalpinum (Hilend & J.T. Howell) Cronquist
- Galium Multiflorum Kellogg var. watsonii A. Gray
- Galium Munzii Hilend & J.T. Howell var. carneum Hilend & J.T. Howell
- Galium Munzii Hilend & J.T. Howell var. kingstonense Dempster
- Galium Munzii Hilend & J.T. Howell var. subalpinum Hilend & J.T. Howell
- Galium Nuttallii A. Gray ssp. ovalifolium (Dempster) Dempster & Stebbins
- Galium Nuttallii A. Gray ssp. tenue (Dempster) Dempster & Stebbins
- Galium Nuttallii A. Gray var. cliftonsmithii Dempster
- Galium Nuttallii A. Gray var. ovalifolium Dempster
- Galium Nuttallii A. Gray var. tenue Dempster
- Galium Obtusum Bigelow var. filifolium (Wiegand) Fernald
- Galium Obtusum Bigelow var. floridanum (Wiegand) Fernald
- Galium Obtusum Bigelow var. ramosum Gleason
- Galium Occidentale McClatchie
- Galium Parisiense L. ssp. anglicum (Huds.) Gaudich.
- Galium Parisiense L. ssp. parvifolium (Gaudich. ex Roem. & Schult.) Gaudich.
- Galium Parisiense L. var. anglicum (Huds.) G. Beck
- Galium Parisiense L. var. divaricatum (Pourr. ex Lam.) Vis.
- Galium Parisiense L. var. leiocarpum Tausch
- Galium Parisiense L. var. trichocarpum Tausch
- Galium Parisiense L. var. typicum G. Beck
- Galium Parvifolium (Parish) Jeps.
- Galium Parvifolium Gaudich. ex Roem. & Schult.
- Galium Pedemontanum (Bellardi) All.
- Galium Pennsylvanicum W. Bartram
- Galium Peregrina (Walter) Britton, Sterns & Poggenb., non Franch.
- Galium Pilosum Aiton var. laevicaule Weath. & S.F. Blake
- Galium Proliferum A. Gray var. subnudum Greenm.
- Galium Pubens A. Gray
- Galium Pubens A. Gray var. grande (McClatchie) Jeps.
- Galium Pubens A. Gray var. scabridum A. Gray
- Galium Punctatum Pers.
- Galium Puncticulosum Michx.
- Galium Puncticulosum Michx. var. pilosum (Aiton) DC.
- Galium Purpureum Walter, non L.
- Galium Rothrockii A. Gray
- Galium Rotundifolium L. var. circaezans (Michx.) Kuntze
- Galium Rotundifolium L. var. lanceolatum (Torr.) Kuntze
- Galium Scabriusculum (Ehrend.) Dempster & Ehrend.
- Galium Scabriusculum (Ehrend.) Dempster & Ehrend. ssp. protoscabriusculum Dempster &
- Galium Septentrionale Roem. & Schult.
- Galium Siccatum W. Wight
- Galium Siccatum W. Wight var. anotinum Jeps.
- Galium Spurium L.
- Galium Spurium L. var. echinospermum (Wallr.) Hayek
- Galium Spurium L. var. vaillantii (DC.) G. Beck
- Galium Spurium L. var. vaillantii (DC.) Gren. & Godr.
- Galium Stellatum Kellogg var. eremicum Hilend & J.T. Howell
- Galium Strictum Torr.
- Galium Subbiflorum (Wiegand) Rydb.
- Galium Subscabridum Wight
- Galium Suffruticosum Nutt.
- Galium Texanum (Torr. & A. Gray) Wiegand, non Scheele
- Galium Texanum Scheele
- Galium Tinctorium (L.) Scop. ssp. floridanum (Wiegand) Puff
- Galium Tinctorium (L.) Scop. var. diversifolium W. Wight
- Galium Tinctorium (L.) Scop. var. filifolium Wiegand
- Galium Tinctorium (L.) Scop. var. floridanum Wiegand
- Galium Tinctorium (L.) Scop. var. labradoricum Wiegand
- Galium Tinctorium (L.) Scop. var. subbiflorum (Wiegand) Fernald
- Galium Torreyi Bigelow
- Galium Trichocarpum Nutt.
- Galium Tricorne Stokes p.p.
- Galium Trifidum L. ssp. brevipes (Fernald & Wiegand) Á. Löve & D. Löve
- Galium Trifidum L. ssp. pacificum (Wiegand) Piper
- Galium Trifidum L. ssp. tinctorium (L.) H. Hara
- Galium Trifidum L. var. halophilum Fernald & Wiegand
- Galium Trifidum L. var. latifolium Torr.
- Galium Trifidum L. var. pacificum Wiegand
- Galium Trifidum L. var. pusillum A. Gray
- Galium Trifidum L. var. subbiflorum Wiegand
- Galium Trifidum L. var. tinctorium (L.) Torr. & A. Gray
- Galium Trifidum L. var. trifidum
- Galium Triflorum Michx. var. asprelliforme Fernald
- Galium Triflorum Michx. var. viridiflorum DC.
- Galium Uncinulatum DC. var. obstipum (Schltdl.) S. Watson
- Galium Vaillantii DC.
- Galium Verum L. ssp. wirtgenii (F.W. Schultz) Oborny
- Galium Virgatum Nutt. var. diffusum A. Gray
- Galium Virgatum Nutt. var. leiocarpum Torr. & A. Gray
- Galium Walteri J.F. Gmel.
- Galium Watsonii (A. Gray) A. Heller ssp. puberulum (Piper) Ehrend.
- Galium Wirtgenii F.W. Schultz
- Galium Wrightii A. Gray var. rothrockii (A. Gray) Ehrend. ex Ferris
- Galium ×ochroleucum Wolf ex Schweigg.
- Gall Of The Earth - Prenanthes Trifoliolata (Cass.) Fernald
- Gallan - Cyrtosperma Merkusii (Hassk.) Schott
- Gallant Soldier - Galinsoga Parviflora Cav.
- Gallant Soldier - Galinsoga Ruiz & Pav.
- Galleta Grass - Pleuraphis Torr.
- Gallic Cracked Lichen - Acarospora Gallica H. Magn.
- Gallion Hawthorn - Crataegus Meridionalis Sarg.
- Galphimia Elegans Baill. [excluded]
- Galphimia Glauca Cav. [excluded]
- Galpinsia Camporum Wooton & Standl.
- Galpinsia Hartwegii (Benth.) Britton
- Galpinsia Interior Small
- Galpinsia Lavandulifolia (Torr. & A. Gray) Small
- Galpinsia Toumeyi Small
- Galvezia Speciosa (Nutt.) A. Gray
- Galypola Incarnata (L.) Nieuwl.
- Gama Medic - Medicago Rugosa Desr.
- Gamagrass - Tripsacum L.
- Gamba-pea - Crotalaria Goreensis Guill. & Perr.
- Gambel Oak - Quercus Gambelii Nutt.
- Gambel Oak - Quercus Gambelii Nutt. var. bonina S.L. Welsh
- Gambel Oak - Quercus Gambelii Nutt. var. gambelii
- Gambel's Dwarf Milkvetch - Astragalus Gambelianus Sheldon
- Gambel's Yellowcress - Nasturtium Gambelii (S. Watson) O.E. Schulz
- Gambian Dayflower - Commelina Nigritana Benth. var. gambiae (C.B. Clarke) Brenan
- Gambir - Uncaria Gambir (Hunter) Roxb.
- Gamo De Costa - Phyllanthus Juglandifolius Willd.
- Gamochaeta Calviceps (Fernald) Cabrera
- Gamochaeta Spicata (Lam.) Cabrera
- Gamón-blanco - Asphodelus Albus Mill.
- Gander's Buckhorn Cholla - Cylindropuntia Ganderi (C.B. Wolf) J. Rebman
- Gander's Cryptantha - Cryptantha Ganderi I.M. Johnst.
- Gander's Ragwort - Packera Ganderi (T.M. Barkley & R.M. Beauch.) W.A. Weber & Á. Löve
- Gaping Dutchman's Pipe - Aristolochia Ringens Vahl
- Gaping Grass - Steinchisma Hians (Elliott) Nash
- Gaping Grass - Steinchisma Raf.
- Garbancillo - Peganum Mexicanum A. Gray
- Garber's Blazing Star - Liatris Garberi A. Gray
- Garber's Sandmat - Chamaesyce Garberi (Engelm. ex Chapm.) Small
- Garberia Fruticosa (Nutt.) A. Gray
- Garberia - Garberia A. Gray
- Garberia - Garberia Heterophylla (W. Bartram) Merr. & F. Harper
- Garcia Mayana Britton
- Garcia Rohr
- Garcinia - Garcinia Indica (Thouars) Choisy
- Garcinia - Garcinia Kola Heckel
- Garcinia - Garcinia Lateriflora Blume
- Garcinia - Garcinia Multiflora Champ. ex Benth.
- Garcinia - Garcinia Myrtifolia A.C. Sm.
- Garcinia - Garcinia Xanthochymus Hook. f. ex T. Anderson
- Garcinia Matsudai Kaneh., orth. var.
- Garcinia Matudai Kaneh., orth. var.
- Garcinia Tinctoria (DC.) W. Wight
- Garden Asparagus - Asparagus Officinalis L.
- Garden Baby's-breath - Gypsophila Scorzonerifolia Ser.
- Garden Chervil - Anthriscus Cerefolium (L.) Hoffm.
- Garden Cornflower - Centaurea Cyanus L.
- Garden Cosmos - Cosmos Bipinnatus Cav.
- Garden Croton - Codiaeum Variegatum (L.) A. Juss.
- Garden Cucumber - Cucumis Sativus L.
- Garden Dewberry - Rubus Aboriginum Rydb.
- Garden Ginger - Zingiber Officinale Roscoe
- Garden Heliotrope - Heliotropium Arborescens L.
- Garden Huckleberry - Solanum Melanocerasum All.
- Garden Hyacinth - Hyacinthus Orientalis L.
- Garden Leek - Allium Porrum L.
- Garden Lettuce - Lactuca Sativa L.
- Garden Lovage - Levisticum Officinale W.D.J. Koch
- Garden Mignonette - Reseda Odorata L.
- Garden Onion - Allium Cepa L.
- Garden Onion - Allium ×proliferum (Moench) Schrad. ex Willd.
- Garden Orache - Atriplex Hortensis L.
- Garden Pea - Pisum Sativum L.
- Garden Puff - Neptunia Prostrata (Lam.) Baill.
- Garden Rhubarb - Rheum Rhabarbarum L.
- Garden Snapdragon - Antirrhinum Majus L.
- Garden Sorrel - Rumex Acetosa L.
- Garden Sorrel - Rumex Acetosa L. ssp. acetosa
- Garden Sorrel - Rumex Acetosa L. ssp. alpestris (Jacq.) Á. Löve
- Garden Sorrel - Rumex Acetosa L. ssp. pseudoxyria Tolm.
- Garden Sorrel - Rumex Acetosa L. ssp. thyrsiflorus (Fingerh.) Hayek
- Garden Stonecrop - Hylotelephium Erythrostictum (Miq.) H. Ohba
- Garden Thyme - Thymus Vulgaris L.
- Garden Tomato - Solanum Lycopersicum L.
- Garden Tomato - Solanum Lycopersicum L. var. cerasiforme (Dunal) Spooner, G.J. Anderson & R.K. Jansen
- Garden Tomato - Solanum Lycopersicum L. var. lycopersicum
- Garden Valerian - Valeriana Officinalis L.
- Garden Vetch - Vicia Sativa L.
- Garden Vetch - Vicia Sativa L. ssp. nigra (L.) Ehrh.
- Garden Vetch - Vicia Sativa L. ssp. sativa
- Garden Yellow Loosestrife - Lysimachia Vulgaris L.
- Garden Yellowrocket - Barbarea Vulgaris W.T. Aiton
- Garden-huckleberry - Solanum Scabrum Mill.
- Gardencress Pepperweed - Lepidium Sativum L.
- Gardenia Angusta Merr.,, database artifact
- Gardenia Augusta Merr., nom. illeg.
- Gardenia Florida L.
- Gardenia - Gardenia Ellis
- Gardenia Mannii H. St. John & Kuykend. var. honoluluensis H. St. John & Kuykend.
- Gardenia Weissichii H. St. John
- Gardner's Ptychomitrium Moss - Ptychomitrium Gardneri Lesq.
- Gardner's Saltbush - Atriplex Gardneri (Moq.) D. Dietr.
- Gardner's Yampah - Perideridia Gairdneri (Hook. & Arn.) Mathias
- Garfield Lupine - Lupinus Garfieldensis C.P. Sm.
- Garland Spiraea - Spiraea ×arguta Zabel
- Garland-flower - Daphne Cneorum L.
- Garland-lily - Hedychium J. Koenig
- Garlic Mustard - Alliaria Petiolata (M. Bieb.) Cavara & Grande
- Garlicvine - Mansoa Alliacea (Lam.) A.H. Gentry
- Garlicvine - Mansoa Dc.
- Garnotia Acutigluma (Steud.) Ohwi
- Garnotia Sandwicensis Hillebr.
- Garovagl's Miriquidica Lichen - Miriquidica Garovaglii (Schaerer) Hertel & Rambold
- Garovagl's Rim Lichen - Lecanora Garovaglii (Körb.) Zahlbr.
- Garrett's Beardtongue - Penstemon Scariosus Pennell var. garrettii (Pennell) N.H. Holmgren
- Garrett's Bladderpod - Lesquerella Garrettii Payson
- Garrett's Firechalice - Epilobium Canum (Greene) P.H. Raven ssp. garrettii (A. Nelson) P.H. Raven
- Garrett's Fleabane - Erigeron Garrettii A. Nelson
- Garrett's Florida Pineland Spurge - Euphorbia Inundata Torr. ex Chapm. var. garrettii E.L.Bridges & Orzell
- Garrett's Saltbush - Atriplex Garrettii Rydb.
- Garrya Flavescens S. Watson ssp. congdonii (Eastw.) Dahling
- Garrya Flavescens S. Watson ssp. pallida (Eastw.) Dahling
- Garrya Flavescens S. Watson var. pallida (Eastw.) Bacig. ex Ewan
- Garrya Fremontii Torr. var. laxa Eastw.
- Garrya Goldmanii Wooton & Standl.
- Garrya Lindheimeri Torr.
- Garysmithia Bifurcata Steere
- Gaslight Bladderpod - Lesquerella Recurvata (Engelm. ex A. Gray) S. Watson
- Gasoul Crystallinum (L.) Rothm.
- Gasoul Nodiflorum (L.) Rothm.
- Gasplant - Dictamnus Albus L.
- Gaspé Peninsula Arrowgrass - Triglochin Gaspensis Lieth & D. Löve
- Gaspé Peninsula Bluegrass - Poa ×gaspensis Fernald (pro sp.)
- Gaspé Serviceberry - Amelanchier Sanguinea (Pursh) DC. var. gaspensis Wiegand
- Gaspé Willow - Salix ×gaspensis C.K. Schneid.
- Gasquet Manzanita - Arctostaphylos Hispidula Howell
- Gasquet Rose - Rosa Gymnocarpa Nutt. var. serpentina Ertter & W.H.Lewis
- Gastony's Cliffbrake - Pellaea Gastonyi Windham
- Gastridium Ventricosum auct. non (Gouan) Schinz & Thell.
- Gastrolychnis Affinis (J. Vahl ex Fr.) Tolm. & Kozh.
- Gastrolychnis Angustifolia Rupr. ssp. tenella (Tolm.) Tolm. & Kozh.
- Gastrolychnis Apetala (L.) Tolm. & Kozh.
- Gastrolychnis Apetala (L.) Tolm. & Kozh. ssp. arctica (Fr.) Á. Löve & D. Löve
- Gastrolychnis Apetala (L.) Tolm. & Kozh. ssp. uralensis (Rupr.) Á. Löve & D. Löve
- Gastrolychnis Drummondii (Hook.) Á. Löve & D. Löve
- Gastrolychnis Involucrata (Cham. & Schltdl.) Á. Löve & D. Löve
- Gastrolychnis Involucrata (Cham. & Schltdl.) Á. Löve & D. Löve ssp. elatior (Regel) Á. Löv
- Gastrolychnis Involucrata (Cham. & Schltdl.) Á. Löve & D. Löve ssp. tenella (Tolm.) Á. Löv
- Gastrolychnis Kingii (S. Watson) W.A. Weber
- Gastrolychnis Macrosperma (A.E. Porsild) Tolm. & Kozh.
- Gastrolychnis Ostenfeldii (A.E. Porsild) V.V. Petrovsky
- Gastrolychnis Soczaviana (Schischkin) Tolm. & Kozh.
- Gastrolychnis Soczaviana (Schischkin) Tolm. & Kozh. ssp. ogilviensis (A.E. Porsild) Á. Lö
- Gastrolychnis Taimyrensis (Tolm.) Czerep.
- Gastrolychnis Triflora (R. Br. ex Sommerf.) Tolm. & Kozh. ssp. dawsonii (B.L. Rob.) Á.
- Gastrolychnis Uralensis Rupr.
- Gastronychia Herniarioides (Michx.) Small
- Gate Canyon Buckwheat - Eriogonum Hylophilum Reveal & Brotherson
- Gatesia Laetevirens (Buckley) A. Gray
- Gattinger's Goldenrod - Solidago Gattingeri Chapm. ex A. Gray
- Gattinger's Lobelia - Lobelia Appendiculata A. DC. var. gattingeri (A. Gray) McVaugh
- Gattinger's Mock Orange - Philadelphus Gattingeri Hu
- Gattinger's Panicgrass - Panicum Gattingeri Nash
- Gattinger's Rosinweed - Silphium Integrifolium Michx. var. gattingeri L.M. Perry
- Gaudichaud's Halberd Fern - Tectaria Gaudichaudii (Mett.) Maxon
- Gaudichaud's Sawsedge - Morelotia Gahniiformis Gaudich.
- Gaudichaud's Senna - Senna Gaudichaudii (Hook. & Arn.) Irwin & Barneby
- Gaudichaud's Syrrhopodon Moss - Syrrhopodon Gaudichaudii Mont.
- Gaumerocassia Ekmaniana (Urb.) Britton ex Britton & Rose
- Gaura Angustifolia Michx.
- Gaura Biennis L.
- Gaura Biennis L. var. pitcheri Torr. & A. Gray
- Gaura Boquillensis P.H. Raven & D.P. Greg.
- Gaura Brachycarpa Small
- Gaura Calcicola P.H. Raven & D.P. Greg.
- Gaura Cinerea Wooton & Standl.
- Gaura Coccinea Nutt. ex Pursh
- Gaura Coccinea Nutt. ex Pursh var. arizonica Munz
- Gaura Coccinea Nutt. ex Pursh var. epilobioides (Kunth) Munz
- Gaura Coccinea Nutt. ex Pursh var. glabra (Lehm.) Munz
- Gaura Coccinea Nutt. ex Pursh var. parvifolia (Torr.) Rickett
- Gaura Coccinea Nutt. ex Pursh var. typica Munz
- Gaura Decorticans Hook. & Arn.
- Gaura Demareei P.H. Raven & D.P. Greg.
- Gaura Drummondii (Spach) Torr. & A. Gray
- Gaura Eatonii Small
- Gaura Filiformis Small
- Gaura Filipes Spach
- Gaura Filipes Spach var. major Torr. & A. Gray
- Gaura Glabra Lehm.
- Gaura Gracilis Wooton & Standl.
- Gaura Gracilis Wooton & Standl. var. typica Munz
- Gaura Heterandra Torr.
- Gaura Hexandra Ortega
- Gaura Hexandra Ortega ssp. gracilis (Wooton & Standl.) P.H. Raven & D.P. Greg.
- Gaura Hexandra Ortega ssp. hexandra Ortega [excluded]
- Gaura Hexandra Ortega var. coryi (Munz) Munz
- Gaura Hexandra Ortega var. triangulata (Buckley) Munz
- Gaura L.
- Gaura Lindheimeri Engelm. & A. Gray
- Gaura Longiflora Spach
- Gaura Macrocarpa Rothr.
- Gaura Mckelveyae (Munz) P.H. Raven & D.P. Greg.
- Gaura Michauxii Spach
- Gaura Mollis James, nom. utique rej.
- Gaura Nealleyi J.M. Coult.
- Gaura Neomexicana Wooton
- Gaura Neomexicana Wooton ssp. coloradensis (Rydb.) P.H. Raven & D.P. Greg.
- Gaura Neomexicana Wooton ssp. neomexicana
- Gaura Neomexicana Wooton var. coloradensis (Rydb.) Munz
- Gaura Neomexicana Wooton var. typica Munz
- Gaura Odorata Sessé ex Lag.
- Gaura Parviflora Douglas ex Lehm.
- Gaura Parviflora Douglas ex Lehm. var. lachnocarpa Weath.
- Gaura Parviflora Douglas ex Lehm. var. typica Munz
- Gaura Pitcheri (Torr. & A. Gray) Small
- Gaura Simulans Small
- Gaura Sinuata Nutt. ex Ser.
- Gaura Suffulta Engelm. ex A. Gray
- Gaura Suffulta Engelm. ex A. Gray ssp. nealleyi (J.M. Coult.) P.H. Raven & D.P.
- Gaura Suffulta Engelm. ex A. Gray ssp. suffulta
- Gaura Triangulata Buckley
- Gaura Tripetala Cav.
- Gaura Tripetala Cav. var. coryi Munz
- Gaura Tripetala Cav. var. triangulata (Buckley) Munz
- Gaura Villosa Torr.
- Gaura Villosa Torr. ssp. parksii (Munz) P.H. Raven & Gregory
- Gaura Villosa Torr. ssp. villosa
- Gaura Villosa Torr. var. arenicola Munz
- Gaura Villosa Torr. var. mckelveyae Munz
- Gaura Villosa Torr. var. parksii Munz
- Gaura Villosa Torr. var. typica Munz
- Gaurella Canescens (Torr. & Frém.) A. Nelson
- Gaussia - Gaussia H. Wendl.
- Gaviota Tarplant - Deinandra Increscens (H.M. Hall ex D.D. Keck) B.G. Baldw. ssp. villosa (Tanowitz) B.G
- Gaya Violacea Rose
- Gaylussacia Bigeloviana (Fernald) Sorrie & Weakley
- Gaylussacia Dumosa (Andrews) Torr. & A. Gray var. bigeloviana Fernald
- Gaylussacia Frondosa (L.) Torr. & A. Gray ex Torr. var. nana A. Gray
- Gaylussacia Frondosa (L.) Torr. & A. Gray ex Torr. var. tomentosa A. Gray
- Gaylussacia Orocola Small
- Gaylussacia Resinosa (Aiton) Torr. & A. Gray
- Gaymallow - Batesimalva Fryxell
- Gayoides Crispum (L.) Small
- Gayophytum Diffusum Torr. & A. Gray var. strictipes (Hook.) Dorn
- Gayophytum Diffusum Torr. & A. Gray var. villosum Munz
- Gayophytum Helleri Rydb.
- Gayophytum Helleri Rydb. var. erosulatum Jeps.
- Gayophytum Helleri Rydb. var. glabrum Munz
- Gayophytum Humile Juss. var. hirtellum Munz
- Gayophytum Intermedium Rydb.
- Gayophytum Lasiospermum Greene
- Gayophytum Lasiospermum Greene var. hoffmannii Munz
- Gayophytum Nuttallii Torr. & A. Gray
- Gayophytum Nuttallii Torr. & A. Gray var. abramsii Munz
- Gayophytum Nuttallii Torr. & A. Gray var. intermedium (Rydb.) Munz
- Gayophytum Racemosum Torr. & A. Gray var. caesium (Torr. & A. Gray) Munz
- Gayophytum Strictum A. Gray
- Gaywings - Polygala Paucifolia Willd.
- Gazania - Gazania Gaertn.
- Gazania Longiscapa DC.
- Gazania Splendens Lem.
- Gearstem Cactus - Peniocereus Striatus (Brandegee) Buxbaum
- Geheebia Moss - Geheebia Schimp.
- Geiser's Fleabane - Erigeron Geiseri Shinners
- Geisleria Sychnogonioides Nitschke
- Gelatinous Skin Lichen - Leptogium Gelatinosum (With.) J.R. Laundon
- Gelatinous Trapeliopsis Lichen - Trapeliopsis Gelatinosa (Flörke) Coppins & P. James
- Gemmingia Chinensis (L.) Kuntze
- Genevieve's Indian Paintbrush - Castilleja Genevievana G.L. Nesom
- Geniostoma J.r. Forst. & G. Forst.
- Geniostoma Micranthum DC.
- Geniostoma Micranthum DC. var. hoeferi (Gilg & Benedict) Fosberg
- Geniostoma Micranthum DC. var. micranthum
- Geniostoma Vitiense Gilg & Gilg-Ben.
- Genipa Americana L. var. caruto (Kunth) K. Schum.
- Genipa Caruto Kunth
- Genipa Clusiifolia Jacq.
- Genipa - Genipa L.
- Genista Monosperma (L.) Lam.
- Genista Multibracteata Tausch
- Genista Patula M. Bieb.
- Genista Tinctoria L. var. tinctoria
- Genista Tridentata L.
- Gennar's Rinodina Lichen - Rinodina Gennarii Bagl.
- Geno Geno - Lonchocarpus Domingensis (Turp. ex Pers.) DC.
- Geno - Lonchocarpus Glaucifolius Urb.
- Gentian Beardtongue - Penstemon Gentianoides (Kunth) Poir.
- Gentian - Gentiana Acaulis L.
- Gentian - Gentiana L.
- Gentian - Gentiana ×billingtonii Farw. (pro sp.)
- Gentian - Gentiana ×curtisii J. Pringle
- Gentian - Gentiana ×grandilacustris J. Pringle
- Gentian - Gentiana ×pallidocyanea J. Pringle
- Gentian Noddingcaps - Triphora Gentianoides (Sw.) Ames & Schltr.
- Gentiana Acuta Michx.
- Gentiana Affinis Griseb. var. bigelovii (A. Gray) Kusnez.
- Gentiana Affinis Griseb. var. forwoodii (A. Gray) Kusnez.
- Gentiana Affinis Griseb. var. major A. Nelson & Kennedy
- Gentiana Affinis Griseb. var. ovata A. Gray
- Gentiana Affinis Griseb. var. parvidentata Kusnez.
- Gentiana Aleutica Cham. & Schltdl.
- Gentiana Amarella L. ssp. acuta (Michx.) Hultén
- Gentiana Amarella L. ssp. heterosepala (Engelm.) J.M. Gillett
- Gentiana Amarella L. var. acuta (Michx.) Herder
- Gentiana Amarella L. var. plebeja (Ledeb. ex Spreng.) Hultén
- Gentiana Amarella L. var. stricta (Griseb.) S. Watson
- Gentiana Amarella auct. non L. p.p.
- Gentiana Aphylla Jacq.
- Gentiana Aquatica auct. non L.
- Gentiana Arctophila Griseb.
- Gentiana Aurea L.
- Gentiana Barbata Froel.
- Gentiana Barbellata Engelm.
- Gentiana Bigelovii A. Gray
- Gentiana Bisetaea Howell
- Gentiana Calycosa Griseb. var. asepala (Maguire) C.L. Hitchc.
- Gentiana Calycosa Griseb. var. obtusiloba (Rydb.) C.L. Hitchc.
- Gentiana Calycosa Griseb. var. xantha A. Nelson
- Gentiana Catesbaei Walter var. nummulariifolia Fernald
- Gentiana Cherokeensis (W.P. Lemmon) Fernald
- Gentiana Crinita Froel.
- Gentiana Crinita Froel. ssp. victorinii (Fernald) J.M. Gillett
- Gentiana Crinita Froel. var. browniana (Hook.) B. Boivin
- Gentiana Crinita Froel. var. tonsa (Lunell) B. Boivin
- Gentiana Deloachii (W.P. Lemmon) Shinners
- Gentiana Detonsa Rottb.
- Gentiana Detonsa Rottb. var. groenlandica Vict.
- Gentiana Detonsa Rottb. var. nesophila (T. Holm) B. Boivin
- Gentiana Detonsa Rottb. var. raupii (A.E. Porsild) B. Boivin
- Gentiana Detonsa Rottb. var. unicaulis (A. Nelson) C.L. Hitchc.
- Gentiana Elegans A. Nelson
- Gentiana Elliottii Chapm.
- Gentiana Elliottii Chapm. var. latifolia Chapm.
- Gentiana Flavida A. Gray
- Gentiana Forwoodii A. Gray
- Gentiana Gaspensis Vict.
- Gentiana Grandis (A. Gray) T. Holm
- Gentiana Heterosepala Engelm.
- Gentiana Holopetala (A. Gray) T. Holm
- Gentiana Interrupta Greene
- Gentiana Latidens (House) J.S. Pringle & Weakley
- Gentiana Linearis Froel. ssp. rubricaulis (Schwein.) J.M. Gillett
- Gentiana Linearis Froel. var. lanceolata A. Gray
- Gentiana Linearis Froel. var. latifolia A. Gray
- Gentiana Macounii T. Holm
- Gentiana Menziesii Griseb.
- Gentiana Microcalyx Lemmon
- Gentiana Nesophila T. Holm
- Gentiana Nigricans Lam.
- Gentiana Nutans Bunge
- Gentiana Oregana Engelm. ex A. Gray
- Gentiana Plebeja Ledeb. ex Spreng.
- Gentiana Plebeja Ledeb. ex Spreng. var. holmii Wettst.
- Gentiana Porphyrio J.F. Gmel.
- Gentiana Procera T. Holm
- Gentiana Propinqua Richardson
- Gentiana Propinqua Richardson ssp. arctophila (Griseb.) Hultén
- Gentiana Prostrata Haenke var. americana Engelm.
- Gentiana Puberula Michx., as to type, non sensu Small
- Gentiana Puberula auct. non Michx.
- Gentiana Quadrangularis Lam.
- Gentiana Quinquefolia L.
- Gentiana Quinquefolia L. var. occidentalis A. Gray
- Gentiana Raupii A.E. Porsild
- Gentiana Richardsonii A.E. Porsild
- Gentiana Romanzovii Ledeb. ex Bunge
- Gentiana Rusbyi Greene
- Gentiana Saponaria L. var. linearis (Froel.) Griseb.
- Gentiana Sceptrum Griseb. var. cascadensis M. Peck
- Gentiana Sceptrum Griseb. var. humilis Engelm. ex A. Gray
- Gentiana Scopulorum (Greene) Tidestr.
- Gentiana Setigera auct. non A. Gray
- Gentiana Simplex A. Gray
- Gentiana Strictiflora (Rydb.) A. Nelson
- Gentiana Tenella Rottb.
- Gentiana Thermalis Kuntze
- Gentiana Tiogana A. Heller
- Gentiana Tonsa (Lunell) Vict.
- Gentiana Tortuosa M.E. Jones
- Gentiana Ventricosa Griseb.
- Gentiana Verna L. [excluded]
- Gentiana Verticillata L.
- Gentiana Victorinii Fernald
- Gentiana Wislizeni Engelm.
- Gentiana Wrightii A. Gray
- Gentianella Acuta (Michx.) Hiitonen
- Gentianella Amarella (L.) Börner ssp. wrightii (A. Gray) J.M. Gillett
- Gentianella Amarella (L.) Börner var. acuta (Michx.) Herder
- Gentianella Amarella (L.) Börner var. heterosepala (Engelm.) Dorn
- Gentianella Barbellata (Engelm.) J.M. Gillett
- Gentianella Crinita (Froel.) G. Don
- Gentianella Crinita (Froel.) G. Don ssp. macounii (T. Holm) J.M. Gillett
- Gentianella Crinita (Froel.) G. Don ssp. nevadensis (Gilg) Weaver & Rudenberg
- Gentianella Crinita (Froel.) G. Don ssp. procera (T. Holm) J.M. Gillett
- Gentianella Detonsa (Rottb.) G. Don
- Gentianella Detonsa (Rottb.) G. Don ssp. elegans (A. Nelson) J.M. Gillett
- Gentianella Detonsa (Rottb.) G. Don ssp. holopetala (A. Gray) J.M. Gillett
- Gentianella Detonsa (Rottb.) G. Don ssp. nesophila (T. Holm) J.M. Gillett
- Gentianella Detonsa (Rottb.) G. Don ssp. raupii (A.E. Porsild) J.M. Gillett
- Gentianella Detonsa (Rottb.) G. Don ssp. superba (Greene) J.M. Gillett
- Gentianella Detonsa (Rottb.) G. Don ssp. yukonensis J.M. Gillett
- Gentianella Detonsa (Rottb.) G. Don var. elegans (A. Nelson) Dorn
- Gentianella Heterosepala (Engelm.) Holub
- Gentianella Occidentalis (A. Gray) Small
- Gentianella Propinqua (Richardson) J.M. Gillett ssp. arctophila (Griseb.) Tzvelev
- Gentianella Propinqua (Richardson) J.M. Gillett var. aleutica (Cham. & Schltdl.) S.L.
- Gentianella Quinquefolia (L.) Small var. quinquefolia
- Gentianella Simplex (A. Gray) J.M. Gillett
- Gentianella Strictiflora (Rydb.) W.A. Weber
- Gentianodes Algida (Pall.) Á. Löve & D. Löve
- Gentianodes Glauca (Pall.) Á. Löve & D. Löve
- Gentianopsis Detonsa (Rottb.) Ma var. elegans (A. Nelson) N.H. Holmgren
- Gentianopsis Elegans (A. Nelson) Ma
- Gentianopsis Nesophila (T. Holm) Iltis
- Gentianopsis Procera (T. Holm) Ma
- Gentianopsis Procera (T. Holm) Ma ssp. macounii (T. Holm) Iltis
- Gentianopsis Procera (T. Holm) Ma var. victorinii (Fernald) Iltis
- Gentianopsis Raupii (A.E. Porsild) Iltis
- Gentner's Fritillary - Fritillaria Gentneri Gilkey
- Gentry's Indigobush - Dalea Tentaculoides Gentry
- Geobalanus Oblongifolius (Michx.) Small
- Geobalanus Pallidus Small
- Geocalyx Graveolens (Schrad.) Nees
- Geocalyx Nees
- Geocarpa Groundnut - Macrotyloma Geocarpum (Harms) Marechal & Baudet
- Geocarpon - Geocarpon Mack.
- Geodorum Densiflorum (Lam.) Schltr.
- Geodorum Jacks.
- Geoffrea Inermis W. Wright
- Geoffroea Jacq.
- Geophila - Geophila D. Don
- Geophila Herbacea (Jacq.) K. Schum.
- Geoprumnon Crassicarpum (Nutt.) Rydb. ex Small
- Geoprumnon Mexicanum (A. DC.) Rydb. ex Small
- Geoprumnon Plattense (Nutt.) Rydb.
- Geoprumnon Succulentum (Richardson) Rydb.
- Geoprumnon Tennesseense (A. Gray ex Chapm.) Rydb.
- Georgia Aster - Symphyotrichum Georgianum (Alexander) G.L. Nesom
- Georgia Beaksedge - Rhynchospora Harveyi W. Boott var. culixa (Gale) Kral
- Georgia Beargrass - Nolina Georgiana Michx.
- Georgia Bully - Sideroxylon Thornei (Cronquist) T.D. Penn.
- Georgia Bulrush - Scirpus Georgianus Harper
- Georgia Calamint - Clinopodium Georgianum Harper
- Georgia False Indigo - Amorpha Georgiana Wilbur
- Georgia False Indigo - Amorpha Georgiana Wilbur var. confusa Wilbur
- Georgia False Indigo - Amorpha Georgiana Wilbur var. georgiana
- Georgia Frostweed - Helianthemum Georgianum Chapm.
- Georgia Holly - Ilex Longipes Chapm. ex Trel.
- Georgia Indian Plantain - Arnoglossum Sulcatum (Fernald) H. Rob.
- Georgia Ironweed - Vernonia Pulchella Small
- Georgia Milkwort - Polygala Leptostachys Shuttlw. ex A. Gray
- Georgia Oak - Quercus Georgiana M.A. Curtis
- Georgia Quillwort - Isoetes Georgiana N. Luebke
- Georgia Rockcress - Arabis Georgiana Harper
- Georgia Rush - Juncus Georgianus Coville
- Georgia Skullcap - Scutellaria Glabriuscula Fernald
- Georgia Sweetshrub - Calycanthus Brockianus Ferry & Ferry
- Georgia Tickseed - Coreopsis Nudata Nutt.
- Georgiaplume - Elliottia Racemosa Muhl. ex Elliott
- Geothallus Campb.
- Geothallus Tuberosus Campb.
- Geraea Canescens Torr. & A. Gray var. canescens
- Geraea Canescens Torr. & A. Gray var. paniculata (A. Gray) S.F. Blake
- Geraldton Carnation Weed - Euphorbia Terracina L.
- Geraldton Wax - Chamelaucium Uncinatum Schauer
- Geranium Anemonifolium L'Hér. ex Aiton
- Geranium Aralia - Polyscias Guilfoylei (W. Bull) L.H. Bailey
- Geranium Attenuilobum G.N. Jones & F.F. Jones
- Geranium Bicknellii Britton var. longipes (S. Watson) Fernald
- Geranium Caespitosum James ssp. atropurpureum (A. Heller) W.A. Weber
- Geranium Canum Rydb.
- Geranium Carolinianum L. var. australe (Benth.) Fosberg
- Geranium Carolinianum L. var. confertiflorum Fernald
- Geranium Carolinianum L. var. longipes S. Watson
- Geranium Concinnum G.N. Jones & F.F. Jones
- Geranium Cowenii Rydb.
- Geranium Cuneatum Hook. ssp. hololeucum (A. Gray) Carlq. & Bissing
- Geranium Cuneatum Hook. ssp. hypoleucum (A. Gray) Carlq. & Bissing
- Geranium Cuneatum Hook. ssp. tridens (Hillebr.) Carlq. & Bissing
- Geranium Cuneatum Hook. var. menziesii A. Gray
- Geranium Cuneatum Hook. var. rockii Skottsb.
- Geranium Eremophilum Wooton & Standl.
- Geranium Fremontii Torr. ex A. Gray
- Geranium Fremontii Torr. ex A. Gray var. cowenii (Rydb.) Harrington
- Geranium Fremontii Torr. ex A. Gray var. parryi Engelm.
- Geranium - Geranium L.
- Geranium Glabratum (Hook.) Small
- Geranium Humile Hillebr.
- Geranium Humile Hillebr. ssp. kauaiense (Rock) Carlq. & Bissing
- Geranium Humile Hillebr. var. kauaiense Rock
- Geranium Laxum Hanks
- Geranium Marginale Rydb. ex Hanks & Small
- Geranium Microphyllum Hook. f.
- Geranium Multiflorum A. Gray ssp. ovatifolium (A. Gray) Carlq. & Bissing
- Geranium Multiflorum A. Gray var. canum Hillebr.
- Geranium Multiflorum A. Gray var. forbesii (O. Deg. & I. Deg.) H. St. John
- Geranium Multiflorum A. Gray var. ovatifolium (A. Gray) Fosberg
- Geranium Multiflorum A. Gray var. superbum (O. Deg. & I. Deg. & Greenw.) H. St. John
- Geranium Nemorale Suksd.
- Geranium Nemorale Suksd. var. bicknellii (Britton) Fernald
- Geranium Nepalense Sweet [excluded]
- Geranium Nepalense Sweet var. thunbergii (Siebold ex Lindl. & Paxton) Kudo
- Geranium Nepalense Sweet var. thunbergii auct. non (Siebold ex Lindl. & Paxton) Kud
- Geranium Nervosum Rydb.
- Geranium Ovatifolium A. Gray
- Geranium Parryi (Engelm.) A. Heller
- Geranium - Pelargonium L'hér. ex Aiton
- Geranium Pilosum G. Forst.
- Geranium Pratense L. var. erianthum (DC.) B. Boivin
- Geranium Purpureum Vill.
- Geranium Sphaerospermum Fernald
- Geranium Striatum L.
- Geranium Strigosius H. St. John
- Geranium Strigosum Rydb., non Burm. f.
- Geranium Toquimense A.H. Holmgren & N.H. Holmgren
- Geranium Tridens Hillebr.
- Geranium Viscosissimum Fisch. & C.A. Mey. ex C.A. Mey. ssp. nervosum (Rydb.) W.A. Weber
- Geranium Viscosissimum Fisch. & C.A. Mey. ex C.A. Mey. var. nervosum (Rydb.) C.L. Hitch
- Geraniumleaf Phacelia - Phacelia Geraniifolia Brand
- Geraniumleaf Thoroughwort - Chromolaena Geraniifolia (Urb.) R.M. King & H. Rob.
- Gerard Jointfir - Ephedra Gerardiana Wall. ex Stapf
- Gerardia Acuta (Pennell) Pennell
- Gerardia Aphylla Nutt.
- Gerardia Aphylla Nutt. var. grandiflora Benth.
- Gerardia Aspera Douglas ex Benth.
- Gerardia Auriculata Michx.
- Gerardia Barbata (Torr. & A. Gray) S.F. Blake
- Gerardia Besseyana Britton
- Gerardia Caddoensis (Pennell) Pennell
- Gerardia Calycina (Pennell) Pennell
- Gerardia Calycosa (Mack. & Bush) Fernald
- Gerardia Decemloba Greene
- Gerardia Densiflora Benth.
- Gerardia Dispersa (Small) K. Schum.
- Gerardia Divaricata Chapm.
- Gerardia Dulcis (Cav.) Nees
- Gerardia Dulcis (Cav.) Nees var. floridana (A. Gray) S.F. Blake
- Gerardia Edwardsiana (Pennell) Pennell
- Gerardia Edwardsiana (Pennell) Pennell ssp. glabra (Pennell) Pennell
- Gerardia Edwardsiana (Pennell) Pennell ssp. typica Pennell
- Gerardia Fasciculata Elliott
- Gerardia Fasciculata Elliott ssp. peninsularis (Pennell) Pennell
- Gerardia Filicaulis (Benth.) Chapm.
- Gerardia Filifolia Nutt.
- Gerardia Filifolia Nutt. var. gatesii Benth.
- Gerardia Flava L.
- Gerardia Flava L. var. calycosa (Mack. & Bush) Steyerm.
- Gerardia Flava L. var. macrantha (Pennell) Fernald
- Gerardia Flava L. var. reticulata (Raf.) Cory
- Gerardia Floridana (A. Gray) Small
- Gerardia Gatesii (Benth.) Pennell
- Gerardia Gattingeri Small
- Gerardia Georgiana C.L. Boynt.
- Gerardia Grandiflora Benth.
- Gerardia Grandiflora Benth. var. cinerea (Pennell) Cory
- Gerardia Grandiflora Benth. var. pulchra (Pennell) Fernald
- Gerardia Grandiflora Benth. var. serrata (Torr. ex Benth.) B.L. Rob.
- Gerardia Heterophylla Nutt.
- Gerardia Homalantha (Pennell) Pennell
- Gerardia Keyensis (Pennell) Pennell
- Gerardia Laevigata Raf.
- Gerardia Laxa (Pennell) Pennell
- Gerardia Leucanthera Raf.
- Gerardia Linifolia Nutt.
- Gerardia Longifolia Nutt.
- Gerardia Maritima Raf.
- Gerardia Maritima Raf. ssp. grandiflora (Benth.) Pennell
- Gerardia Maritima Raf. var. grandiflora Benth.
- Gerardia Microphylla (A. Gray) Small
- Gerardia Neoscotica Greene
- Gerardia Obtusifolia (Raf.) Pennell
- Gerardia Parvifolia (Benth.) Chapm.
- Gerardia Patula (Chapm.) A. Gray
- Gerardia Paupercula (A. Gray) Britton
- Gerardia Paupercula (A. Gray) Britton ssp. borealis (Pennell) Pennell
- Gerardia Paupercula (A. Gray) Britton var. borealis (Pennell) Deam
- Gerardia Paupercula (A. Gray) Britton var. typica Pennell
- Gerardia Pectinata (Nutt.) Benth.
- Gerardia Pedicularia L.
- Gerardia Pedicularia L. var. ambigens Fernald
- Gerardia Pedicularia L. var. austromontana (Pennell) Fernald
- Gerardia Pedicularia L. var. intercedens (Pennell) Fernald
- Gerardia Pedicularia L. var. pectinata Nutt.
- Gerardia Plukenetii Elliott
- Gerardia Plukenetii Elliott var. microphylla A. Gray
- Gerardia Polyphylla Small
- Gerardia Portoricensis Britton & P. Wilson
- Gerardia Pseudaphylla (Pennell) Pennell
- Gerardia Pulchella Pennell
- Gerardia Pulchella Pennell var. delicatula (Pennell) Pennell
- Gerardia Pulcherrima Pennell
- Gerardia Purpurea L.
- Gerardia Purpurea L. ssp. parvula Pennell
- Gerardia Purpurea L. var. carteri (Pennell) Pennell
- Gerardia Purpurea L. var. grandiflora Benth.
- Gerardia Purpurea L. var. neoscotica (Greene) Gleason
- Gerardia Purpurea L. var. parviflora Benth.
- Gerardia Purpurea L. var. paupercula A. Gray
- Gerardia Purpurea L. var. racemulosa (Pennell) Gleason
- Gerardia Racemulosa Pennell
- Gerardia Setacea J.F. Gmel.
- Gerardia Setacea J.F. Gmel. var. parvifolia Benth.
- Gerardia Skinneriana Alph. Wood
- Gerardia Spiciflora Engelm.
- Gerardia Stenophylla (Pennell) Pennell
- Gerardia Strictifolia Benth.
- Gerardia Tenella (Pennell) Pennell
- Gerardia Tenuifolia Vahl
- Gerardia Tenuifolia Vahl ssp. leucanthera (Raf.) Pennell
- Gerardia Tenuifolia Vahl ssp. macrophylla (Benth.) Pennell
- Gerardia Tenuifolia Vahl ssp. parviflora (Nutt.) Pennell
- Gerardia Tenuifolia Vahl ssp. polyphylla (Small) Pennell
- Gerardia Tenuifolia Vahl var. humilis Benth.
- Gerardia Tenuifolia Vahl var. leucanthera (Raf.) Shinners
- Gerardia Tenuifolia Vahl var. macrophylla Benth.
- Gerardia Tenuifolia Vahl var. parviflora Nutt.
- Gerardia Tenuifolia Vahl var. polyphylla (Small) Shinners
- Gerardia Tenuifolia Vahl var. typica Pennell
- Gerardia Tuberosa L.
- Gerardia Virginica (L.) Britton, Sterns & Poggenb.
- Gerardia Viridis Small
- German Chamomile - Matricaria Recutita L.
- German Hedgenettle - Stachys Germanica L.
- German Iris - Iris Germanica L.
- German Knotgrass - Scleranthus Annuus L.
- German Knotgrass - Scleranthus L.
- German's Maiden Fern - Thelypteris Germaniana (Fée) Proctor
- German-madwort - Asperugo L.
- German-madwort - Asperugo Procumbens L.
- Germander Beardtongue - Penstemon Teucrioides Greene
- Germander Meadowsweet - Spiraea Chamaedryfolia L.
- Germander Meadowsweet - Spiraea Chamaedryfolia L. var. chamaedryfolia
- Germander Meadowsweet - Spiraea Chamaedryfolia L. var. ulmifolia (Scop.) Maxim.
- Germander Speedwell - Veronica Chamaedrys L.
- Germander - Teucrium L.
- Gerrard's Aristea - Aristea Gerrardii Weim.
- Gesneria - Gesneria L.
- Gesneria Sintenisii Urb.
- Geum Agrimonioides Pursh
- Geum Aleppicum Jacq. ssp. strictum (Aiton) R.T. Clausen
- Geum Aleppicum Jacq. var. strictum (Aiton) Fernald
- Geum Campanulatum (Greene) G.N. Jones
- Geum Canadense Jacq. var. brevipes Fernald
- Geum Canadense Jacq. var. camporum (Rydb.) Fernald & Weath.
- Geum Canadense Jacq. var. grimesii Fernald & Weath.
- Geum Canescens (Greene) Munz
- Geum Ciliatum Pursh
- Geum Ciliatum Pursh var. griseum (Greene) Kearney & Peebles
- Geum Flavum (Porter) E.P. Bicknell
- Geum Fragarioides (Michx.) Smedmark
- Geum Gracilipes (Piper) M. Peck
- Geum Hirsutum Muhl. ex Link
- Geum Macrophyllum Willd. ssp. perincisum (Rydb.) Hultén
- Geum Macrophyllum Willd. var. rydbergii Farw.
- Geum Oregonense (Scheutz) Rydb.
- Geum Perincisum Rydb.
- Geum Perincisum Rydb. var. intermedium B. Boivin
- Geum Schofieldii Calder & Roy L. Taylor
- Geum Strictum Aiton
- Geum Strictum Aiton var. decurrens (Rydb.) Kearney & Peebles
- Geum Turbinatum Rydb.
- Geum ×pervale B. Boivin
- Geyer Willow - Salix Geyeriana Andersson
- Geyer's Aster - Symphyotrichum Laeve (L.) Á. Löve & D. Löve var. geyeri (A. Gray) G.L. Nesom
- Geyer's Biscuitroot - Lomatium Geyeri (S. Watson) J.M. Coult. & Rose
- Geyer's Larkspur - Delphinium Geyeri Greene
- Geyer's Milkvetch - Astragalus Geyeri A. Gray
- Geyer's Milkvetch - Astragalus Geyeri A. Gray var. geyeri
- Geyer's Milkvetch - Astragalus Geyeri A. Gray var. triquetrus (A. Gray) M.E. Jones
- Geyer's Onion - Allium Geyeri S. Watson
- Geyer's Onion - Allium Geyeri S. Watson var. chatterleyi S.L. Welsh
- Geyer's Onion - Allium Geyeri S. Watson var. geyeri
- Geyer's Oniongrass - Melica Geyeri Munro ex Bol.
- Geyer's Oniongrass - Melica Geyeri Munro ex Bol. var. aristulata J.T. Howell
- Geyer's Oniongrass - Melica Geyeri Munro ex Bol. var. geyeri
- Geyer's Sandmat - Chamaesyce Geyeri (Engelm. & A. Gray) Small
- Geyer's Sandmat - Chamaesyce Geyeri (Engelm. & A. Gray) Small var. geyeri
- Geyer's Sandmat - Chamaesyce Geyeri (Engelm. & A. Gray) Small var. wheeleriana (Warnock & M.C. Johns
- Geyer's Sedge - Carex Geyeri Boott
- Geyer's Twinpod - Physaria Geyeri (Hook.) A. Gray
- Geyer's Twinpod - Physaria Geyeri (Hook.) A. Gray var. geyeri
- Geysers Panicgrass - Dichanthelium Acuminatum (Sw.) Gould & C.A. Clark var. thermale (Bol.) Freckmann
- Ghanja Kola - Cola Nitida (Vent.) A. Chev.
- Ghiesbreght's Panicgrass - Panicum Ghiesbreghtii Fourn.
- Ghinia Boxiana Moldenke
- Ghinia Spinosa (Sw.) Britton & P. Wilson
- Gholson's Blazing Star - Liatris Gholsonii L.C. Anderson
- Gholson's Sedge - Carex Gholsonii Naczi & Cochrane
- Gholson's Spider-lily - Hymenocallis Gholsonii G. Lom. Sm. & Garland
- Ghost Flower - Mohavea Confertiflora (A. DC.) A. Heller
- Ghost Gum - Corymbia Papuana (F. Muell.) K.D. Hill & L.A.S. Johnson
- Ghost Orchid - Dendrophylax Rchb.
- Ghostplant - Voyria Aubl.
- Ghostweed - Phenax Weddell
- Gia Verde - Casearia Arborea (Rich.) Urb.
- Giant Airplant - Tillandsia Fasciculata Sw.
- Giant Airplant - Tillandsia Fasciculata Sw. var. clavispica Mez
- Giant Airplant - Tillandsia Fasciculata Sw. var. densispica Mez
- Giant Airplant - Tillandsia Fasciculata Sw. var. fasciculata
- Giant Airplant - Tillandsia Fasciculata Sw. var. venosispica Mez
- Giant Angelica - Angelica Ampla A. Nelson
- Giant Antifever Fontinalis Moss - Fontinalis Antipyretica Hedw. var. gigantea (Sull.) Sull.
- Giant Antitrichia Moss - Antitrichia Curtipendula (Hedw.) Brid. var. gigantea Sull. & Lesq.
- Giant Arrowhead - Sagittaria Montevidensis Cham. & Schltdl.
- Giant Bamboo - Dendrocalamus Asper (Schult. f.) Backer ex Heyne
- Giant Beaksedge - Rhynchospora Gigantea Link
- Giant Bellflower - Campanula Latifolia L.
- Giant Blue Cohosh - Caulophyllum Giganteum (Farw.) Loconte & Blackwell
- Giant Blue Eyed Mary - Collinsia Grandiflora Lindl.
- Giant Blue Iris - Iris Giganticaerulea Small
- Giant Brake - Pteris Tripartita Sw.
- Giant Bristlegrass - Setaria Magna Griseb.
- Giant Calliergon Moss - Calliergon Giganteum (Schimp.) Kindb.
- Giant Cane - Arundinaria Gigantea (Walter) Muhl.
- Giant Chainfern - Woodwardia Fimbriata Sm.
- Giant Checkerbloom - Sidalcea Gigantea G. Clifton, R.E. Buck, & S.R. Hill
- Giant Chinquapin - Chrysolepis Chrysophylla (Douglas ex Hook.) Hjelmqvist
- Giant Chinquapin - Chrysolepis Chrysophylla (Douglas ex Hook.) Hjelmqvist var. chrysophylla
- Giant Chinquapin - Chrysolepis Chrysophylla (Douglas ex Hook.) Hjelmqvist var. minor (Benth.) Munz
- Giant Coreopsis - Coreopsis Gigantea (Kellogg) H.M. Hall
- Giant Cowbane - Oxypolis Greenmanii Mathias & Constance
- Giant Cutgrass - Zizaniopsis Miliacea (Michx.) Döll & Asch.
- Giant Deathcamas - Zigadenus Exaltatus Eastw.
- Giant Dodder - Cuscuta Reflexa Roxb.
- Giant Dogwood - Cornus Controversa Hemsl. ex Prain
- Giant Dropseed - Sporobolus Giganteus Nash
- Giant False Sensitive Plant - Mimosa Diplotricha C. Wright
- Giant False Spiraea - Sorbaria Kirilowii (Regel) Maxim.
- Giant Fescue - Schedonorus Giganteus (L.) Holub
- Giant Filbert - Corylus Maxima Mill.
- Giant Flatsedge - Cyperus Giganteus Vahl
- Giant Forget-me-not - Myosotidium Hook.
- Giant Forget-me-not - Myosotidium Hortensia (Decne.) Baill.
- Giant Four O'clock - Mirabilis Gigantea (Standl.) Shinners
- Giant Geheebia Moss - Geheebia Gigantea (Funck) Boul.
- Giant Goldenrod - Solidago Gigantea Aiton
- Giant Granadilla - Passiflora Quadrangularis L.
- Giant Hogweed - Heracleum Mantegazzianum Sommier & Levier
- Giant Horsetail - Equisetum Giganteum L.
- Giant Horsetail - Equisetum Telmateia Ehrh.
- Giant Horsetail - Equisetum Telmateia Ehrh. var. braunii (Milde) Milde
- Giant Hyssop - Agastache Clayton ex Gronov.
- Giant Ironweed - Vernonia Gigantea (Walter) Trel.
- Giant Ironweed - Vernonia Gigantea (Walter) Trel. ssp. gigantea
- Giant Ironweed - Vernonia Gigantea (Walter) Trel. ssp. ovalifolia (Torr. & A. Gray) Urbatsch
- Giant Ixora - Ixora Casei Hance var. casei
- Giant Ixora - Ixora Casei Hance var. lanceolata Kaneh.
- Giant Ixora - Ixora Casei Hance var. medialoba Fosberg & Sachet
- Giant Knotweed - Polygonum Sachalinense F. Schmidt ex Maxim.
- Giant Kokee Cyanea - Cyanea Leptostegia A. Gray
- Giant Lousewort - Pedicularis Procera A. Gray
- Giant Milkvetch - Astragalus Giganteus S. Watson
- Giant Milkweed - Calotropis Gigantea (L.) W.T. Aiton
- Giant Miscanthus - Miscanthus ×giganteus J.M. Greef & Deuter ex Hodkinson & Renvoize
- Giant Mountain Aster - Canadanthus Modestus (Lindl.) G.L. Nesom
- Giant Needleleaf - Polycnemum Majus A. Braun
- Giant Orchid - Pteroglossaspis Ecristata (Fernald) Rolfe
- Giant Philodendron - Philodendron Giganteum Schott
- Giant Potatocreeper - Solanum Wendlandii Hook. f.
- Giant Pseudoleskea Moss - Pseudoleskea Incurvata (Hedw.) Loeske var. gigantea (E. Lawton) H.A. Crum, Steere & L.E
- Giant Purple Wakerobin - Trillium Kurabayashii J.D. Freeman
- Giant Red Indian Paintbrush - Castilleja Miniata Douglas ex Hook.
- Giant Red Indian Paintbrush - Castilleja Miniata Douglas ex Hook. ssp. dixonii (Fernald) Kartesz
- Giant Red Indian Paintbrush - Castilleja Miniata Douglas ex Hook. ssp. miniata
- Giant Reed - Arundo Donax L.
- Giant Reed - Arundo L.
- Giant Rhubarb - Gunnera Manicata Linden
- Giant Ricegrass - Achnatherum Coronatum (Thurb.) Barkworth
- Giant Salvinia - Salvinia Biloba Raddi
- Giant Salvinia - Salvinia Herzogii de la Sota
- Giant Sandbur - Cenchrus Palmeri Vasey
- Giant Sandreed - Calamovilfa Gigantea (Nutt.) Scribn. & Merr.
- Giant Sedge - Carex Gigantea Rudge
- Giant Sequoia - Sequoiadendron Giganteum (Lindl.) J. Buchholz
- Giant Sequoia - Sequoiadendron J. Buchholz
- Giant Shield Lichen - Cetrelia Cetrarioides (Delise ex Duby) W.L. Culb. & C.F. Culb.
- Giant Shield Lichen - Cetrelia Monachorum (Zahlbr.) W.L. Culb. & C.F. Culb.
- Giant Shield Lichen - Cetrelia Olivetorum (Nyl.) W.L. Culb. & C.F. Culb.
- Giant Shield Lichen - Cetrelia W.l. Culb. & C.F. Culb.
- Giant Snowdrop - Galanthus Elwesii Hook. f.
- Giant Spanish Needle - Palafoxia Arida B.L. Turner & Morris var. gigantea (M.E. Jones) B.L. Turner & Mo
- Giant Spiderwort - Tradescantia Gigantea Rose
- Giant Sunflower - Helianthus Giganteus L.
- Giant Swordfern - Nephrolepis Biserrata (Sw.) Schott
- Giant Taro - Alocasia Macrorrhizos (L.) G. Don
- Giant Vetch - Vicia Nigricans Hook. & Arn. ssp. gigantea (Hook.) Lassetter & C.R. Gunn.
- Giant Vine Fern - Stenochlaena Tenuifolia (Desv.) T. Moore
- Giant Wakerobin - Trillium Chloropetalum (Torr.) Howell
- Giant Wakerobin - Trillium Chloropetalum (Torr.) Howell var. chloropetalum
- Giant Wakerobin - Trillium Chloropetalum (Torr.) Howell var. giganteum (Hook. & Arn.) Munz
- Giant Waterlily - Victoria Lindl.
- Giant White Fawnlily - Erythronium Oregonum Applegate
- Giant White Fawnlily - Erythronium Oregonum Applegate ssp. leucandrum (Applegate) Applegate
- Giant White Fawnlily - Erythronium Oregonum Applegate ssp. oregonum
- Giant White Wakerobin - Trillium Albidum J.D. Freeman
- Giant White Wakerobin - Trillium Albidum J.D. Freeman ssp. albidum
- Giant Wildrye - Leymus Condensatus (J. Presl) Á. Löve
- Giant Woollystar - Eriastrum Densifolium (Benth.) H. Mason
- Giant Woollystar - Eriastrum Densifolium (Benth.) H. Mason ssp. densifolium
- Giant Woollystar - Eriastrum Densifolium (Benth.) H. Mason ssp. sanctorum (Milliken) H. Mason
- Giant Yarrow - Achillea Millefolium L. var. gigantea (Pollard) Nobs
- Giant-trumpets - Macromeria D. Don
- Giant-trumpets - Macromeria Viridiflora DC.
- Giant-trumpets - Macromeria Viridiflora DC. var. viridiflora
- Giantchickweed - Myosoton Aquaticum (L.) Moench
- Giantdaisy - Leucanthemella Serotina (L.) Tzvelev
- Giantspiral Lady's Tresses - Spiranthes Longilabris Lindl.
- Gibbens' Beardtongue - Penstemon Gibbensii Dorn
- Gibbesia Rugelii (Chapm.) Small
- Gibbs' Milkvetch - Astragalus Gibbsii Kellogg
- Gibraltar Candytuft - Iberis Gibraltarica L.
- Gibson's Cyanea - Cyanea Macrostegia Hillebr. ssp. gibsonii (Hillebr.) Lammers
- Gidgee - Acacia Cambagei R.T. Baker
- Gierisch's Globemallow - Sphaeralcea Gierischii N.D. Atwood & S.L. Welsh
- Gifola Germanica Dumort.
- Gigantochloa - Gigantochloa Apus (Schult. f.) Kurz ex Munro
- Gigantochloa - Gigantochloa Kurz ex Munro
- Gigantochloa - Gigantochloa Verticillata (Willd.) Munro
- Gila County Liveforever - Dudleya Collomiae Rose ex Morton
- Gila Globemallow - Sphaeralcea Rusbyi A. Gray ssp. gilensis Kearney
- Gila Manroot - Marah Gilensis Greene
- Gila Milkvetch - Astragalus Gilensis Greene
- Gila River Dodder - Cuscuta Applanata Engelm.
- Gila River Waterhyssop - Bacopa Eisenii (Kellogg) Pennell
- Gila Rockdaisy - Perityle Gilensis (M.E. Jones) J.F. Macbr.
- Gila Rockdaisy - Perityle Gilensis (M.E. Jones) J.F. Macbr. var. gilensis
- Gila Thistle - Cirsium Gilense Wooton & Standl.
- Gilia Abramsii (Brand) H. Mason & A.D. Grant
- Gilia Abramsii (Brand) H. Mason & A.D. Grant ssp. integrifolia H. Mason & A.D.
- Gilia Acerosa (A. Gray) Britton
- Gilia Achilleifolia Benth. ssp. chamissonis (Greene) Brand
- Gilia Achilleifolia Benth. ssp. staminea (Greene) H. Mason & A.D. Grant
- Gilia Achilleifolia Benth. var. chamissonis (Greene) A. Nelson & J.F. Macbr.
- Gilia Aggregata (Pursh) Spreng.
- Gilia Aggregata (Pursh) Spreng. ssp. euaggregata Brand
- Gilia Aggregata (Pursh) Spreng. ssp. formosissima (Greene) Wherry
- Gilia Aggregata (Pursh) Spreng. var. arizonica (Greene) Fosberg
- Gilia Aggregata (Pursh) Spreng. var. attenuata A. Gray
- Gilia Aggregata (Pursh) Spreng. var. bridgesii A. Gray
- Gilia Aggregata (Pursh) Spreng. var. candida (Rydb.) Cronquist
- Gilia Aggregata (Pursh) Spreng. var. macrosiphon Kearney & Peebles
- Gilia Aggregata (Pursh) Spreng. var. maculata M.E. Jones
- Gilia Arizonica (Greene) Rydb.
- Gilia Attenuata (A. Gray) A. Nelson
- Gilia Australis (H. Mason & A.D. Grant) V.E. Grant & A.D. Grant
- Gilia Beardtongue - Penstemon Ambiguus Torr.
- Gilia Beardtongue - Penstemon Ambiguus Torr. var. ambiguus
- Gilia Bigelovii A. Gray
- Gilia Brachysiphon Wooton & Standl.
- Gilia Brandegeei A. Gray
- Gilia Brecciarum M.E. Jones ssp. argusana A.D. Grant & V.E. Grant
- Gilia Bridgesii (A. Gray) Wherry
- Gilia Burleyana A. Nelson
- Gilia Caespitosa A. Gray
- Gilia Calcarea M.E. Jones
- Gilia Calothrysa I.M. Johnst.
- Gilia Campanulata A. Gray
- Gilia Campylantha Wooton & Standl.
- Gilia Candida Rydb.
- Gilia Candida Rydb. ssp. collina (Greene) Wherry
- Gilia Candida Rydb. ssp. vera Wherry
- Gilia Capillaris Kellogg
- Gilia Caruifolia Abrams
- Gilia Cephaloidea Rydb.
- Gilia Ciliata Benth.
- Gilia Congesta Hook.
- Gilia Congesta Hook. ssp. palmifrons Brand
- Gilia Congesta Hook. var. burleyana (A. Nelson) Constance & Rollins
- Gilia Congesta Hook. var. crebrifolia (Nutt.) A. Gray
- Gilia Congesta Hook. var. frutescens (Rydb.) Cronquist
- Gilia Congesta Hook. var. montana (A. Nelson & Kennedy) Constance & Rollins
- Gilia Congesta Hook. var. palmifrons (Brand) Cronquist
- Gilia Congesta Hook. var. pseudotypica Constance & Rollins
- Gilia Congesta Hook. var. viridis Cronquist
- Gilia Crebrifolia Nutt.
- Gilia Depressa M.E. Jones ex A. Gray
- Gilia Dichotoma (Benth.) Benth.
- Gilia Dichotoma (Benth.) Benth. var. integra M.E. Jones
- Gilia Filifolia Nutt.
- Gilia Filiformis Parry ex A. Gray
- Gilia Formosa Greene ex Brand
- Gilia Frutescens Rydb.
- Gilia - Gilia Ruiz & Pav.
- Gilia Gilioides (Benth.) Greene
- Gilia Gilioides (Benth.) Greene ssp. glutinosa (Benth.) H. Mason & A.D. Grant
- Gilia Gilioides (Benth.) Greene ssp. volcanica (Brand) H. Mason & A.D. Grant
- Gilia Gilioides (Benth.) Greene var. violacea (A. Heller) Cronquist
- Gilia Globularis Brand
- Gilia Gracilis Hook.
- Gilia Gracilis Hook. var. humilior (Hook.) H. St. John
- Gilia Grinnellii Brand, nom. utique rej.
- Gilia Gunnisonii Torr. & A. Gray
- Gilia Hallii Parish
- Gilia Havardii A. Gray
- Gilia Haydenii A. Gray
- Gilia Heterostyla S. Cochrane & A.G. Day
- Gilia Hutchinsifolia Rydb.
- Gilia Incisa Benth.
- Gilia Inconspicua (Sm.) Sweet var. sinuata (Douglas ex Benth.) A. Gray
- Gilia Inconspicua (Sm.) Sweet var. tweedyi (Rydb.) Cronquist
- Gilia Insignis (Brand) Cory & Parks
- Gilia Inyoensis I.M. Johnst.
- Gilia Jacens A.D. Grant & V.E. Grant
- Gilia Latiflora (A. Gray) A. Gray ssp. cana (M.E. Jones) H. Mason & A.D. Grant
- Gilia Latiflora (A. Gray) A. Gray ssp. cosana A.D. Grant & V.E. Grant
- Gilia Latiflora (A. Gray) A. Gray ssp. excellens (Brand) A.D. Grant & V.E. Grant
- Gilia Latiflora (A. Gray) A. Gray ssp. exilis (A. Gray) H. Mason & A.D. Grant
- Gilia Latiflora (A. Gray) A. Gray ssp. leptantha (Parish) H. Mason & A.D. Grant
- Gilia Latiflora (A. Gray) A. Gray ssp. purpusii (Milliken) H. Mason & A.D. Grant
- Gilia Latiflora (A. Gray) A. Gray ssp. speciosa (Jeps.) H. Mason & A.D. Grant
- Gilia Latiflora (A. Gray) A. Gray ssp. triceps (Brand) H. Mason & A.D. Grant
- Gilia Latiflora (A. Gray) A. Gray var. triceps (Brand) Cronquist
- Gilia Latifolia S. Watson
- Gilia Latifolia S. Watson var. imperialis S.L. Welsh
- Gilia Latifolia S. Watson var. latifolia
- Gilia Laxiflora (J.M. Coult.) Osterh.
- Gilia Leptalea (A. Gray) Greene
- Gilia Leptalea (A. Gray) Greene ssp. bicolor H. Mason & A.D. Grant
- Gilia Leptalea (A. Gray) Greene ssp. leptalea
- Gilia Leptalea (A. Gray) Greene ssp. pinnatisecta H. Mason & A.D. Grant
- Gilia Leptantha Parish ssp. salticola (Eastw.) A.D. Grant & V.E. Grant
- Gilia Leptantha Parish ssp. vivida A.D. Grant & V.E. Grant
- Gilia Leptomeria A. Gray
- Gilia Leptomeria A. Gray ssp. micromeria (A. Gray) H. Mason & A.D. Grant
- Gilia Leptomeria A. Gray ssp. rubella (Brand) H. Mason & A.D. Grant
- Gilia Leptomeria A. Gray var. micromeria (A. Gray) Cronquist
- Gilia Longiflora (Torr.) G. Don
- Gilia Lottiae Day
- Gilia Ludens Shinners
- Gilia Macombii Torr. ex A. Gray
- Gilia Maculata Parish
- Gilia Mcvickerae M.E. Jones
- Gilia Micromeria A. Gray
- Gilia Minutiflora Benth.
- Gilia Montezumae Tidestr. & Dayton
- Gilia Multicaulis Benth.
- Gilia Multicaulis Benth. ssp. millefoliata (Fisch. & C.A. Mey.) H. Mason & A.D. Gr
- Gilia Multicaulis Benth. ssp. nevinii (A. Gray) H. Mason & A.D. Grant
- Gilia Multicaulis Benth. ssp. pedunculata (Eastw.) H. Mason & A.D. Grant
- Gilia Multicaulis Benth. var. alba Milliken
- Gilia Multiflora Nutt.
- Gilia Nevadensis Tidestr.
- Gilia Nuttallii A. Gray
- Gilia Nyensis Reveal
- Gilia Ochroleuca M.E. Jones ssp. transmontana H. Mason & A.D. Grant
- Gilia Ophthalmoides Brand ssp. australis A.D. Grant & V.E. Grant
- Gilia Ophthalmoides Brand ssp. clokeyi (H. Mason) A.D. Grant & V.E. Grant
- Gilia Ophthalmoides Brand ssp. flavocincta (A. Nelson) A.D. Grant & V.E. Grant
- Gilia Parvula Rydb., non Greene, nom. illeg.
- Gilia Penstemonoides M.E. Jones
- Gilia Perennans Shinners
- Gilia Pharnaceoides Benth.
- Gilia Pinnatifida Nutt. ex A. Gray
- Gilia Pinnatifida Nutt. ex A. Gray var. calcarea (M.E. Jones) Brand
- Gilia Polyantha Rydb.
- Gilia Polyantha Rydb. var. whitingii Kearney & Peebles
- Gilia Polycladon Torr.
- Gilia Pringlei auct. non A. Gray
- Gilia Propinqua (Suksd.) H. St. John
- Gilia Pumila Nutt.
- Gilia Pungens (Torr.) Benth.
- Gilia Pungens (Torr.) Benth. var. hookeri (Douglas ex Hook.) A. Gray
- Gilia Rigidula Benth.
- Gilia Rigidula Benth. ssp. acerosa (A. Gray) Wherry
- Gilia Rigidula Benth. ssp. insignis Brand
- Gilia Rigidula Benth. ssp. rigidula
- Gilia Rigidula Benth. var. acerosa A. Gray
- Gilia Ripleyi Barneby
- Gilia Roseata Rydb.
- Gilia Rubra (L.) A. Heller
- Gilia Sedifolia Brandegee
- Gilia Septentrionalis (H. Mason) H. St. John
- Gilia Sinistra M.E. Jones
- Gilia Sinistra M.E. Jones ssp. pinnatisecta (H. Mason & A.D. Grant) A.G. Day
- Gilia Sinistra M.E. Jones ssp. sinistra
- Gilia Sinuata Douglas ex Benth. var. tweedyi (Rydb.) Cronquist
- Gilia Spicata Nutt.
- Gilia Spicata Nutt. var. capitata A. Gray
- Gilia Spicata Nutt. var. cephaloidea (Rydb.) Constance & Rollins
- Gilia Spicata Nutt. var. orchidacea (Brand) Cronquist
- Gilia Spicata Nutt. var. tridactyla (Rydb.) Constance & Rollins
- Gilia Splendens Douglas ex H. Mason & A.D. Grant
- Gilia Splendens Douglas ex H. Mason & A.D. Grant ssp. australis H. Mason & A.D.
- Gilia Splendens Douglas ex H. Mason & A.D. Grant ssp. grantii (Brand) V.E. Grant
- Gilia Splendens Douglas ex H. Mason & A.D. Grant ssp. grinnellii (Brand) H. Maso
- Gilia Splendens Douglas ex H. Mason & A.D. Grant ssp. splendens
- Gilia Squarrosa (Eschsch.) Hook. & Arn.
- Gilia Stenothyrsa A. Gray
- Gilia Subacaulis Rydb.
- Gilia Subnuda Torr. ex A. Gray
- Gilia Subnuda Torr. ex A. Gray ssp. haydenii (A. Gray) Brand
- Gilia Subnuda Torr. ex A. Gray ssp. superba (Eastw.) Brand
- Gilia Tenerrima A. Gray
- Gilia Tenuiflora Benth. ssp. interior H. Mason & A.D. Grant
- Gilia Tenuiflora Benth. var. altissima Parish
- Gilia Tenuiflora sensu Lindl., non Benth.
- Gilia Tenuis F.G. Sm. & Neese
- Gilia Tenuituba Rydb.
- Gilia Tetrabreccia A.D. Grant & V.E. Grant
- Gilia Texana (Greene) Wooton & Standl.
- Gilia Thurberi (Torr. ex A. Gray) A. Gray
- Gilia Tridactyla Rydb.
- Gilia Triodon Eastw.
- Gilia Violacea A. Heller
- Gilia Wrightii A. Gray
- Giliastrum Rigidulum (Benth.) Rydb. ssp. acerosum (A. Gray) W.A. Weber
- Gilman's Buckwheat - Eriogonum Gilmanii S. Stokes
- Gilman's Evening Primrose - Camissonia Kernensis (Munz) P.H. Raven ssp. gilmanii (Munz) P.H. Raven
- Gilman's Milkvetch - Astragalus Gilmanii Tidestr.
- Gilman's Springparsley - Cymopterus Gilmanii Morton
- Gilo - Solanum Gilo Raddi
- Gina's Phacelia - Phacelia Gina-glenneae N.D. Atwood & S.L. Welsh
- Ginger - Zingiber Mill.
- Ginger-leaf Morning-glory - Ipomoea Asarifolia (Desr.) Roem. & Schult.
- Gingerbush - Pavonia Spinifex (L.) Cav.
- Gingerleaf Cyanea - Cyanea Asarifolia H. St. John
- Gingerleaf - Lycianthes Asarifolia (Kunth & Bouché) Bitter
- Gingermint - Mentha ×gracilis Sole (pro sp.)
- Ginkgo - Ginkgo L.
- Ginoria - Ginoria Jacq.
- Ginseng - Eleutherococcus Maxim.
- Ginseng - Eleutherococcus Pentaphyllus (Siebold & Zucc.) Nakai
- Ginseng - Panax L.
- Ginseng - Panax Pseudoginseng Wall.
- Ginseng - Panax Pseudoginseng Wall. ssp. pseudoginseng
- Giradol - Chrozophora Tinctoria (L.) Raf.
- Girard's Thyrea Lichen - Thyrea Girardii (Durieu & Mont.) Bagl. & Carestia
- Girdlepod - Mitracarpus Zucc.
- Girgensohn's Sphagnum - Sphagnum Girgensohnii Russow
- Girgensohnia Ruthenica (Weinm.) Kindb.
- Gironniera Celtidifolia Gaudich.
- Gironniera Gaudich.
- Gisekia - Gisekia L.
- Githopsis Calycina Benth.
- Githopsis Calycina Benth. var. hirsuta Benth.
- Githopsis Filicaulis Ewan
- Githopsis Gilioides Ewan
- Githopsis Latifolia Eastw.
- Githopsis Specularioides Nutt. ssp. candida Ewan
- Githopsis Specularioides Nutt. var. glabra Jeps.
- Githopsis Specularioides Nutt. var. hirsuta Nutt.
- Glabraria Geniculata (Marshall) Britton
- Glacial Kiaeria Moss - Kiaeria Glacialis (Berggr.) I. Hagen
- Glacial Sedge - Carex Glacialis Mack.
- Glacial Willow - Salix Ovalifolia Trautv. var. glacialis (Andersson) Argus
- Glacier Avens - Geum Glaciale Adams ex Fisch. & C.A. Mey.
- Glacier Brachythecium Moss - Brachythecium Glaciale Schimp.
- Glacier Buttercup - Ranunculus Glacialis (Schltdl.) Hultén ssp. chamissonis
- Glacier Buttercup - Ranunculus Glacialis L.
- Glacier Buttercup - Ranunculus Glacialis L. ssp. glacialis
- Glacier Eyebright - Euphrasia Vinacea P.D. Sell & Yeo
- Glade Fern - Diplazium Pycnocarpon (Spreng.) Broun
- Glade Fimbry - Fimbristylis Brevivaginata Kral
- Glade Larkspur - Delphinium Treleasei Bush ex K.C. Davis
- Glade Lobelia - Lobelia Glandulosa Walter
- Glade Violet - Viola Egglestonii Brainerd
- Gladecress - Leavenworthia Torr.
- Glademallow - Napaea Dioica L.
- Glades Spikerush - Eleocharis Bifida S.G. Sm.
- Gladiator Milkvetch - Astragalus Xiphoides (Barneby) Barneby
- Gladiolus Byzantinus Mill.
- Gladiolus - Gladiolus L.
- Gladiolus - Gladiolus ×colvillei Sweet
- Gladiolus - Gladiolus ×gandavensis Van Houtte
- Gladiolus Lemoinei hort. [excluded]
- Gladiolus Murielae Kelway & Langport ex anon.
- Gladiolus Primulinus E.G. Baker [excluded]
- Gladiolus Segetum Ker Gawl.
- Gladiolus Ukambanensis (Baker) Marais
- Gladiolus ×hortulanus L.H. Bailey
- Gland Indian Paintbrush - Castilleja Glandulifera Pennell
- Gland Onion - Allium Glandulosum Link & Otto
- Gland Sandwort - Arenaria Congesta Nutt. var. glandulifera Maguire
- Glandleaf Milkwort - Polygala Macradenia A. Gray
- Glandleaf Prairie Clover - Dalea Lachnostachys A. Gray
- Glandstem Blackberry - Rubus Glandicaulis Blanch.
- Glandular Blazing Star - Liatris Glandulosa G.L. Nesom & R. O'Kennon
- Glandular Bundleflower - Desmanthus Glandulosus (B.L. Turner) Luckow
- Glandular Cape Marigold - Dimorphotheca Sinuata DC.
- Glandular Clarkia - Clarkia Arcuata (Kellogg) A. Nelson & J.F. Macbr.
- Glandular Clover - Trifolium Glanduliferum Boiss.
- Glandular Dwarf-flax - Hesperolinon Adenophyllum (A. Gray) Small
- Glandular False Calico - Loeselia Glandulosa (Cav.) G. Don
- Glandular Hareleaf - Lagophylla Glandulosa A. Gray
- Glandular Maiden Fern - Thelypteris Decussata (L.) Proctor
- Glandular Milkwort - Polygala Glandulosa Kunth
- Glandular Nakedwood - Colubrina Glandulosa Perkins
- Glandular Nakedwood - Colubrina Glandulosa Perkins var. antillana (M.C. Johnst.) M.C. Johnst.
- Glandular Phacelia - Phacelia Glandulosa Nutt.
- Glandular Phacelia - Phacelia Glandulosa Nutt. var. deserta (A. Nelson) Brand
- Glandular Phacelia - Phacelia Glandulosa Nutt. var. glandulosa
- Glandular Plantain - Plantago Afra L.
- Glandular Rose - Rosa Myriadenia Greene, nom. inq.
- Glandular Senna - Senna Multiglandulosa (Jacq.) Irwin & Barneby
- Glandular Silverbush - Argythamnia Adenophora A. Gray
- Glandular Speedwell - Veronica Cymbalaria Bodard
- Glandular Threadplant - Nemacladus Glanduliferus Jeps.
- Glandular Threadplant - Nemacladus Glanduliferus Jeps. var. glanduliferus
- Glandular Threadplant - Nemacladus Glanduliferus Jeps. var. orientalis McVaugh
- Glandular Willowherb - Epilobium Halleanum Hausskn.
- Glandular Yellow Phacelia - Phacelia Adenophora J.T. Howell
- Glandularia Bipinnatifida (Nutt.) Nutt. var. brevispicata Umber
- Glandularia Chamaedryfolia Juss.
- Glandularia Drummondii (Lindl.) Small
- Glandularia Lambertii (Sims) Small
- Glandularia Racemosa (Eggert) Umber
- Glandularia Tenuisecta (Briq.) Small
- Glandularia Verecunda Umber
- Glandularia Wrightii (A. Gray) Umber
- Glandulicactus Backeb.
- Glandweed - Parentucellia Viv.
- Glare Snow Lichen - Stereocaulon Glareosum (Savicz) H. Magn.
- Glass Mountain Crested Coralroot - Hexalectris Nitida L.O. Williams
- Glass Mountain Rockdaisy - Perityle Vitreomontana Warnock
- Glassy Onion - Allium Hyalinum Curran
- Glaucomaria Rupicola (L.) M. Choisy
- Glaucous Beardtongue - Penstemon Euglaucus English
- Glaucous Bluegrass - Poa Glauca Vahl
- Glaucous Bluegrass - Poa Glauca Vahl ssp. glauca
- Glaucous Umbrellawort - Tauschia Glauca (J.M. Coult. & Rose) Mathias & Constance
- Glaucous Wild Cabbage - Caulanthus Glaucus S. Watson
- Glaucus Willowherb - Epilobium Glaberrimum Barbey
- Glaucus Willowherb - Epilobium Glaberrimum Barbey ssp. fastigiatum (Nutt.) Hoch & P.H. Raven
- Glaucus Willowherb - Epilobium Glaberrimum Barbey ssp. glaberrimum
- Glaux Maritima L. ssp. obtusifolia (Fernald) B. Boivin
- Glaux Maritima L. var. angustifolia B. Boivin
- Glaux Maritima L. var. macrophylla B. Boivin
- Glaux Maritima L. var. obtusifolia Fernald
- Glebionis - Glebionis Cass.
- Glechoma - Glechoma L.
- Glechoma Hederacea L. var. micrantha Moric.
- Glechoma Hederacea L. var. parviflora (Benth.) House
- Gleditsia Japonica Miq.
- Gleditsia Japonica Miq. var. japonica
- Gleditsia Japonica Miq. var. koraiensis Nakai
- Gleditsia Monosperma Walter
- Gleditsia Sinensis Lam.
- Gleditsia Triacanthos L. var. inermis (L.) C.K. Schneid.
- Glehnia Leiocarpa Mathias
- Glehnia Littoralis F. Schmidt ex Miq. var. leiocarpa (Mathias) B. Boivin
- Gleichenia Bifida (Willd.) Spreng.
- Gleichenia Brevipubis Christ
- Gleichenia Flexuosa (Schrad.) Mett.
- Gleichenia Furcata (L.) Spreng. [excluded]
- Gleichenia Glauca (Houtt.) Hook. [excluded]
- Gleichenia Linearis (Burm. f.) C.B. Clarke
- Gleichenia Linearis (Burm. f.) C.B. Clarke var. linearis
- Gleichenia Owhyensis Hook.
- Gleichenia Pectinata (Willd.) C. Presl
- Gleichenia Rubiginosa Mett.
- Gleichenia Sm.
- Glenwood Milkvetch - Astragalus Loanus Barneby
- Glenwood Springs Rockcress - Arabis Oxylobula Greene
- Glenwoodgrass - Sacciolepis Indica (L.) Chase
- Globba L.
- Globe Amaranth - Gomphrena L.
- Globe Amaranth - Gomphrena Martiana Gillies ex Moq.
- Globe Artichoke - Cynara Scolymus L.
- Globe Ball Lichen - Sphaerophorus Globosus (Huds.) Vain.
- Globe Ball Lichen - Sphaerophorus Globosus (Huds.) Vain. var. gracilis (Müll. Arg.) Zahlbr.
- Globe Beaksedge - Rhynchospora Globularis (Chapm.) Small
- Globe Beaksedge - Rhynchospora Globularis (Chapm.) Small var. globularis
- Globe Beaksedge - Rhynchospora Globularis (Chapm.) Small var. pinetorum (Britton & Small ex Small) Gale
- Globe Beaksedge - Rhynchospora Recognita (Gale) Kral
- Globe Bladderpod - Lesquerella Globosa (Desv.) S. Watson
- Globe Cactus - Mammillaria Haw.
- Globe Candytuft - Iberis Umbellata L.
- Globe Dodder - Cuscuta Potosina Schaffn.
- Globe Dodder - Cuscuta Potosina Schaffn. var. globifera Yunck.
- Globe Dot Lichen - Micarea Globulosella (Nyl.) Coppins
- Globe Earth Lichen - Catapyrenium Globosum J.W. Thomson
- Globe Fimbry - Fimbristylis Globulosa (Retz.) Kunth
- Globe Fishscale Lichen - Psora Globifera (Ach.) A. Massal.
- Globe Flatsedge - Cyperus Echinatus (L.) Alph. Wood
- Globe Penstemon - Penstemon Globosus (Piper) Pennell & D.D. Keck
- Globe Schiedea - Schiedea Globosa H. Mann
- Globe Sedge - Carex Perglobosa Mack.
- Globe Springparsley - Cymopterus Globosus (S. Watson) S. Watson
- Globe Yellowcress - Rorippa Globosa (Turcz. ex Fisch. & C.A. Mey.) Hayek
- Globeberry - Ibervillea Greene
- Globeflower - Trollius L.
- Globefruit Draba - Draba Sphaerocarpa J.F. Macbr. & Payson
- Globefruit Primrose-willow - Ludwigia Sphaerocarpa Elliott
- Globemallow - Sphaeralcea A. St.-Hil.
- Globethistle - Echinops L.
- Globifera Umbrosa J.F. Gmel.
- Globular Maiden Fern - Thelypteris Globulifera (Brack.) C.F. Reed
- Globulinella Moss - Globulinella Globifera (Hampe) Steere
- Globulinella Moss - Globulinella Steere
- Glochidion - Glochidion J.r. Forst. & G. Forst.
- Glochidion Marianum Müll. Arg.
- Glochidion Ponapense Hosok.
- Glomerate Sedge - Carex Aggregata Mack.
- Gloria De La Manana - Ipomoea Carnea Jacq.
- Gloria De La Manana - Ipomoea Carnea Jacq. ssp. fistulosa (Mart. ex Choisy) D. Austin
- Gloriosa Rothschildiana O'Brien
- Glory Of Texas - Thelocactus Bicolor (Galeotti ex N.E. Pfeiffer) Britton & Rose
- Glory Of Texas - Thelocactus Bicolor (Galeotti ex N.E. Pfeiffer) Britton & Rose var. bicolor
- Glory Of Texas - Thelocactus Bicolor (Galeotti ex N.E. Pfeiffer) Britton & Rose var. flavidispinus Ba
- Glory Pea - Clianthus Sol. ex Lindl.
- Glory Wattle - Acacia Spectabilis A. Cunn. ex Benth.
- Glory-of-the-snow - Chionodoxa Forbesii Baker
- Glory-of-the-snow - Chionodoxa Luciliae Boiss.
- Glory-of-the-snow - Chionodoxa Sardensis Whittall ex Barr & Sugden
- Glory-pea - Clianthus Puniceus (G. Don) Sol. ex Lindl.
- Glorybower - Clerodendrum L.
- Glorybower - Clerodendrum ×speciosum Dombrain
- Glorytree - Tibouchina Aubl.
- Glossadelphus Andersonii E.B. Bartram
- Glossocardia Cass.
- Glossogyne Cass.
- Glossogyne Tenuifolia (Labill.) Cass. ex Less.
- Glossogyne Tenuifolia Cass. ex Less.
- Glossopetalon Meionandrum Koehne
- Glossopetalon Nevadense A. Gray
- Glossopetalon Nevadense A. Gray var. stipuliferum (H. St. John) C.L. Hitchc.
- Glossopetalon Planitierum (Ensign) H. St. John
- Glossopetalon Pungens Brandegee var. glabrum (Ensign) H. St. John
- Glossopetalon Stipuliferum H. St. John
- Glossostigma - Glossostigma Wight & Arn.
- Glossostylis Aspera Cham. & Schltdl.
- Glossy Abelia - Abelia ×grandiflora (Rovelli ex André) Rehder
- Glossy Buckthorn - Frangula Alnus Mill.
- Glossy Hawthorn - Crataegus Nitida (Engelm.) Sarg.
- Glossy Maidenhair - Adiantum Pulverulentum L.
- Glossy Privet - Ligustrum Lucidum W.T. Aiton
- Glossy Red Bryum Moss - Bryum Miniatum Lesq.
- Glossy Shower - Senna Surattensis (Burm. f.) Irwin & Barneby
- Glossyleaf Manzanita - Arctostaphylos Nummularia A. Gray
- Glossyseed Yellow Star-grass - Hypoxis Sessilis L.
- Glottidium Vesicarium (Jacq.) Harper
- Glowing Indian Paintbrush - Castilleja Ornata Eastw.
- Glowing Nightshade - Solanum Pseudogracile Heiser
- Glowvine - Saritaea Dugand
- Glowvine - Saritaea Magnifica (Sprague ex Stennis) Dugand
- Glowweed - Hesperodoria Greene
- Glowwort - Sartwellia A. Gray
- Gloxinia - Gloxinia L'hér.
- Gluta - Gluta L.
- Glyceria Borreri (Bab.) Bab.
- Glyceria Californica Beetle
- Glyceria Canadensis (Michx.) Trin. var. laxa (Scribn.) Hitchc.
- Glyceria Elata (Nash ex Rydb.) M.E. Jones
- Glyceria Erecta Hitchc.
- Glyceria Fernaldii (Hitchc.) H. St. John
- Glyceria Hulteniana Á. Löve
- Glyceria Maritima (Huds.) Wahlenb.
- Glyceria Maxima (Hartm.) Holmb. ssp. grandis (S. Watson) Hultén
- Glyceria Maxima (Hartm.) Holmb. var. americana (Torr.) B. Boivin
- Glyceria Nervata (Willd.) Trin.
- Glyceria Otisii Hitchc.
- Glyceria Pallida (Torr.) Trin.
- Glyceria Pallida (Torr.) Trin. var. fernaldii Hitchc.
- Glyceria Pauciflora J. Presl
- Glyceria Rupestris (With.) E.S. Marshall
- Glyceria Septentrionalis Hitchc. var. arkansana (Fernald) Steyerm. & Kucera
- Glyceria Spectabilis Mert. & W.D.J. Koch
- Glyceria Striata (Lam.) Hitchc. ssp. stricta (Scribn.) Hultén
- Glyceria Striata (Lam.) Hitchc. var. stricta (Scribn.) Fernald
- Glyceria Tenella Lange
- Glyceria ×ottawensis Bowden
- Glycine Apios L.
- Glycine Caribaea Jacq.
- Glycine Clandestina H. Wendl.
- Glycine Comosa L.
- Glycine Falcata Benth.
- Glycine - Glycine Tabacina (Labill.) Benth.
- Glycine - Glycine Tomentella Hayata
- Glycine Gracilis Skvortzov
- Glycine Hispida (Moench) Maxim.
- Glycine Javanica L.
- Glycine Javanica auct.
- Glycine Koidzumii Ohwi
- Glycine Phaseoloides Sw.
- Glycine Priceana (B.L. Rob.) Britton
- Glycine Reniformis Pursh, nom. illeg.
- Glycine Reticulata Sw.
- Glycine Soja (L.) Merr., non Siebold & Zucc., nom. illeg.
- Glycine Subterranea L.
- Glycine Tomentosa L., non Dolicholus tomentosus (L.) Vail
- Glycine Ussuriensis Regel & Maack
- Glycine Wightii (Wight & Arn.) Verdc.
- Glycine Wightii (Wight & Arn.) Verdc. var. mearnsii (De Wild.) Verdc.
- Glycosma Occidentalis Nutt. ex Torr. & A. Gray
- Glycosmis Citrifolia (Willd.) Lindl.
- Glycosmis - Glycosmis Corrêa
- Glycyrrhiza Glutinosa Nutt.
- Glycyrrhiza Lepidota Pursh var. glutinosa (Nutt.) S. Watson
- Glyphis Achariana Tuck.
- Glyphis Confluens Zenker
- Glyphis Favulosa Ach.
- Glyphis Lichen - Glyphis Ach.
- Glyphis Lichen - Glyphis Cicatricosa Ach.
- Glypholecia Lichen - Glypholecia Nyl.
- Glypholecia Lichen - Glypholecia Scabra (Pers.) Müll. Arg.
- Glyptopleura - Glyptopleura D.c. Eaton
- Gmelin's Buttercup - Ranunculus Gmelinii DC.
- Gmelin's Saltbush - Atriplex Gmelinii C.A. Mey.
- Gmelin's Sedge - Carex Gmelinii Hook. & Arn.
- Gmelin's Wormwood - Artemisia Gmelinii Webb ex Stechmann
- Gmelina - Gmelina L.
- Gnaphalium Alienum Hook. & Arn.
- Gnaphalium Alpinum L.
- Gnaphalium Americanum Mill.
- Gnaphalium Arizonicum A. Gray
- Gnaphalium Arvense L., nom. inval.
- Gnaphalium Attenuatum DC.
- Gnaphalium Beneolens Davidson
- Gnaphalium Bicolor Bioletti
- Gnaphalium Brachypterum DC.
- Gnaphalium Californicum DC.
- Gnaphalium Calviceps Fernald
- Gnaphalium Canescens DC.
- Gnaphalium Canescens DC. ssp. beneolens (Davidson) Stebbins & Keil
- Gnaphalium Canescens DC. ssp. canescens
- Gnaphalium Canescens DC. ssp. microcephalum (Nutt.) Stebbins & Keil
- Gnaphalium Canescens DC. ssp. thermale (E.E. Nelson) Stebbins & Keil
- Gnaphalium Chilense Spreng.
- Gnaphalium Chilense Spreng. var. confertifolium Greene
- Gnaphalium Collinum Labill.
- Gnaphalium Decurrens Ives, non L.
- Gnaphalium Dimorphum Nutt.
- Gnaphalium Dioicum L.
- Gnaphalium Domingense Lam.
- Gnaphalium Elegans Kunth
- Gnaphalium Falcatum Lam.
- Gnaphalium Germanicum Scop.
- Gnaphalium Grayi A. Nelson & J.F. Macbr.
- Gnaphalium Gymnocephalus DC.
- Gnaphalium Hawaiiense O. Deg. & Sherff
- Gnaphalium Helleri Britton
- Gnaphalium Helleri Britton var. micradenium (Weath.) Mahler
- Gnaphalium Indicum auct. non L.
- Gnaphalium Jaliscense Greenm.
- Gnaphalium Japonicum Thunb.
- Gnaphalium Leucocephalum A. Gray
- Gnaphalium Luteoalbum L.
- Gnaphalium Macounii Greene
- Gnaphalium Margaritaceum L.
- Gnaphalium Microcephalum Nutt.
- Gnaphalium Microcephalum Nutt. ssp. thermale (E.E. Nelson) G.W. Douglas
- Gnaphalium Microcephalum Nutt. var. thermale (E.E. Nelson) Cronquist
- Gnaphalium Norvegicum Gunnerus
- Gnaphalium Obtusifolium L.
- Gnaphalium Obtusifolium L. var. helleri (Britton) S.F. Blake
- Gnaphalium Obtusifolium L. var. micradenium Weath.
- Gnaphalium Obtusifolium L. var. praecox Fernald
- Gnaphalium Obtusifolium L. var. saxicola (Fassett) Cronquist
- Gnaphalium Pensylvanicum Willd.
- Gnaphalium Peregrinum Fernald
- Gnaphalium Plantaginifolium L.
- Gnaphalium Portoricense Urb.
- Gnaphalium Pringlei A. Gray
- Gnaphalium Purpureum L.
- Gnaphalium Purpureum L. var. americanum (Mill.) Klatt
- Gnaphalium Purpureum L. var. falcatum (Lam.) Torr. & A. Gray
- Gnaphalium Purpureum L. var. spathulatum (Lam.) H.E. Ahles
- Gnaphalium Purpureum L. var. ustulatum (Nutt.) B. Boivin
- Gnaphalium Ramosissimum Nutt.
- Gnaphalium Roseum Kunth
- Gnaphalium Sandwicensium Gaudich.
- Gnaphalium Sandwicensium Gaudich. var. flagellare Sherff
- Gnaphalium Sandwicensium Gaudich. var. hawaiiense (O.Deg. & Sherff) W.L. Wagner et al.
- Gnaphalium Sandwicensium Gaudich. var. kilaueanum O. Deg. & Sherff
- Gnaphalium Sandwicensium Gaudich. var. lineatum Sherff
- Gnaphalium Sandwicensium Gaudich. var. molokaiense O. Deg. & Sherff
- Gnaphalium Saxicola Fassett
- Gnaphalium Spathulatum Lam.
- Gnaphalium Sphacilatum Kunth
- Gnaphalium Spicatum Lam.
- Gnaphalium Stramineum Kunth
- Gnaphalium Supinum L.
- Gnaphalium Sylvaticum L.
- Gnaphalium Thermale E.E. Nelson
- Gnaphalium Uliginosum auct. non L.
- Gnaphalium Ustulatum Nutt.
- Gnaphalium Virgatum L.
- Gnaphalium Viscosum Kunth
- Gnaphalium Wrightii A. Gray
- Goat Pea - Securigera Securidaca (L.) O. Deg. & Dorf.
- Goat Willow - Salix Caprea L.
- Goatbush - Castela Erecta Turp.
- Goatbush - Castela Erecta Turp. ssp. erecta
- Goatgrass - Aegilops Bicornis (Forssk.) Jaub. & Spach
- Goatgrass - Aegilops Comosa Sm.
- Goatgrass - Aegilops L.
- Goatgrass - Aegilops Longissima Schweinf. & Muschl.
- Goatgrass - Aegilops Speltoides Tausch
- Goatgrass - Aegilops Umbellulata Zhuk.
- Goatgrass - Aegilops Ventricosa Tausch
- Goatnut - Simmondsia Nutt.
- Goatsbeard - Tragopogon L.
- Goatsbeard - Tragopogon ×crantzii Dichlt.
- Goatsbeard - Tragopogon ×neohybridus Farw.
- Goatsfoot - Passiflora Sexflora Juss.
- Goatweed - Capraria Biflora L.
- Goatwood - Cassipourea Guianensis Aubl.
- Gochnatia - Gochnatia Kunth
- Godetia Amoena (Lehm.) G. Don
- Godetia Amoena (Lehm.) G. Don var. albicaulis Jeps.
- Godetia Amoena (Lehm.) G. Don var. concolor Jeps.
- Godetia Amoena (Lehm.) G. Don var. gracilis (Piper) C.L. Hitchc.
- Godetia Amoena (Lehm.) G. Don var. sonomensis C.L. Hitchc.
- Godetia Biloba (Durand) S. Watson
- Godetia Bottae Spach
- Godetia Bottae Spach var. deflexa (Jeps.) C.L. Hitchc.
- Godetia Cylindrica (Jeps.) C.L. Hitchc.
- Godetia Cylindrica (Jeps.) C.L. Hitchc. var. tracyi Jeps.
- Godetia Dudleyana Abrams
- Godetia Dudleyana Abrams var. brandegeeae Jeps.
- Godetia Epilobioides (Nutt. ex Torr. & A. Gray) S. Watson
- Godetia Hispidula S. Watson
- Godetia Lassenensis Eastw.
- Godetia Pacifica M. Peck
- Godetia Parviflora (Hook. & Arn.) Jeps.
- Godetia Parviflora (Hook. & Arn.) Jeps. var. luteola C.L. Hitchc.
- Godetia Parviflora (Hook. & Arn.) Jeps. var. margaritiae (Jeps.) C.L. Hitchc.
- Godetia Purpurea (W. Curtis) G. Don
- Godetia Purpurea (W. Curtis) G. Don var. parviflora (S. Watson) C.L. Hitchc.
- Godetia Quadrivulnera (Douglas ex Lindl.) Spach
- Godetia Quadrivulnera (Douglas ex Lindl.) Spach var. davyi Jeps.
- Godetia Quadrivulnera (Douglas ex Lindl.) Spach var. vacensis Jeps.
- Godetia Viminea (Douglas ex Hook.) Spach
- Godetia Viminea (Douglas ex Hook.) Spach var. congdonii Jeps.
- Godetia Viminea (Douglas ex Hook.) Spach var. incerta Jeps.
- Godetia Whitneyi (A. Gray) T. Moore
- Godfrey's Blazing Star - Liatris Provincialis Godfrey
- Godfrey's False Dragonhead - Physostegia Godfreyi Cantino
- Godfrey's Goldenaster - Chrysopsis Godfreyi Semple
- Godfrey's Sedge - Carex Godfreyi Naczi
- Godfrey's Spiderlily - Hymenocallis Godfreyi G. Lom. Sm. & Darst
- Godfrey's Stitchwort - Minuartia Godfreyi (Shinners) McNeill
- Godfrey's Swampprivet - Forestiera Godfreyi L.C. Anderson
- Godfrey's Thoroughwort - Eupatorium Godfreyanum Cronquist
- Goebel's Bulbothrix Lichen - Bulbothrix Goebelii (Zenker) Hale
- Goetzea - Goetzea Wydler
- Gold Blazingstar - Mentzelia Chrysantha Engelm. ex Brandegee
- Gold Coast Jasmine - Jasminum Dichotomum Vahl
- Gold Dust Dracaena - Dracaena Surculosa Lindl.
- Gold-dust Acacia - Acacia Acinacea Lindl.
- Gold-of-pleasure - Camelina Sativa (L.) Crantz ssp. alyssum (Mill.) E. Schmid
- Gold-of-pleasure - Camelina Sativa (L.) Crantz ssp. sativa
- Goldback Fern - Pentagramma Triangularis (Kaulf.) Yatsk., Windham & E. Wollenw.
- Goldback Fern - Pentagramma Triangularis (Kaulf.) Yatsk., Windham & E. Wollenw. ssp. triangularis
- Goldback Fern - Pentagramma Yatsk., Windham & E. Wollenw.
- Goldback Fern - Pityrogramma Link
- Goldback Fern - Pityrogramma ×mackenneyi W.H. Wagner
- Goldbloom Saxifrage - Saxifraga Chrysantha A. Gray
- Goldblotch Gladiolus - Gladiolus Papilio Hook. f.
- Golden Asahinea Lichen - Asahinea Chrysantha (Tuck.) W.L. Culb. & C.F. Culb.
- Golden Bamboo - Phyllostachys Aurea Carrière ex A. Rivière & C. Rivière
- Golden Bellapple - Passiflora Laurifolia L.
- Golden Bladderpod - Lesquerella Aurea Wooton
- Golden Blue-eyed Grass - Sisyrinchium Californicum (Ker Gawl.) Aiton
- Golden Brodiaea - Triteleia Ixioides (W.T. Aiton) Greene ssp. ixioides
- Golden Carpetgrass - Axonopus Aureus P. Beauv.
- Golden Chaetopappa - Pentachaeta Aurea Nutt.
- Golden Chaetopappa - Pentachaeta Aurea Nutt. ssp. aurea
- Golden Chain Tree - Laburnum Anagyroides Medik.
- Golden Chain Tree - Laburnum Medik.
- Golden Chain Tree - Laburnum ×watereri (Wettst.) Dippel
- Golden Chamomile - Anthemis Tinctoria L.
- Golden Clover - Trifolium Aureum Pollich
- Golden Colicroot - Aletris Aurea Walter
- Golden Columbine - Aquilegia Chrysantha A. Gray
- Golden Columbine - Aquilegia Chrysantha A. Gray var. chrysantha
- Golden Crownbeard - Verbesina Encelioides (Cav.) Benth. & Hook. f. ex A. Gray
- Golden Crownbeard - Verbesina Encelioides (Cav.) Benth. & Hook. f. ex A. Gray ssp. encelioides
- Golden Crownbeard - Verbesina Encelioides (Cav.) Benth. & Hook. f. ex A. Gray ssp. exauriculata (B.L. Rob.
- Golden Currant - Ribes Aureum Pursh
- Golden Currant - Ribes Aureum Pursh var. aureum
- Golden Currant - Ribes Aureum Pursh var. gracillimum (Coville & Britton) Jeps.
- Golden Currant - Ribes Aureum Pursh var. villosum DC.
- Golden Desert-snapdragon - Mohavea Breviflora Coville
- Golden Dewdrops - Duranta Erecta L.
- Golden Dock - Rumex Maritimus L.
- Golden Draba - Draba Aurea Vahl ex Hornem.
- Golden Dwarfgentian - Gentianella Aurea (L.) H. Sm.
- Golden Eardrops - Ehrendorferia Chrysantha (Hook. & Arn.) Rylander
- Golden Eardrops - Ehrendorferia Fukuhara & Lidén
- Golden Eye Saxifrage - Saxifraga Careyana A. Gray
- Golden Eye-grass - Curculigo Orchioides Gaertn.
- Golden False Beardgrass - Chrysopogon Aciculatus (Retz.) Trin.
- Golden Gladecress - Leavenworthia Aurea Torr.
- Golden Gladecress - Leavenworthia Aurea Torr. var. aurea
- Golden Gladecress - Leavenworthia Aurea Torr. var. texana (Mahler) Rollins
- Golden Hala Pepe - Pleomele Aurea (H. Mann) N.E. Br.
- Golden Hedgehyssop - Gratiola Aurea Pursh
- Golden Indian Paintbrush - Castilleja Levisecta Greenm.
- Golden Insideout Flower - Vancouveria Chrysantha Greene
- Golden Larch - Pseudolarix Gordon, nom. cons.
- Golden Larch - Pseudolarix Kaempferi (Lamb.) Gordon
- Golden Leatherfern - Acrostichum Aureum L.
- Golden Linanthus - Leptosiphon Aureus (Nutt.) J.M. Porter & L.A. Johnson
- Golden Linanthus - Leptosiphon Aureus (Nutt.) J.M. Porter & L.A. Johnson ssp. aureus
- Golden Linanthus - Leptosiphon Aureus (Nutt.) J.M. Porter & L.A. Johnson ssp. decorus (A. Gray) J.M. P
- Golden Lipfern - Cheilanthes Bonariensis (Willd.) Proctor
- Golden Madia - Madia Radiata Kellogg
- Golden Mariposa Lily - Calochortus Aureus S. Watson
- Golden Mock Orange - Philadelphus Caucasicus Koehne [excluded]
- Golden Oatgrass - Trisetum Aureum (Ten.) Ten.
- Golden Polypody - Phlebodium (r. Br.) J. Sm.
- Golden Polypody - Phlebodium Aureum (L.) J. Sm.
- Golden Prairie Clover - Dalea Aurea Nutt. ex Pursh
- Golden Pricklypear - Opuntia Aurea E.M. Baxter
- Golden Pricklypoppy - Argemone Aenea G.B. Ownbey
- Golden Princesplume - Stanleya Pinnata (Pursh) Britton var. integrifolia (James ex Torr.) Rollins
- Golden Pygmypoppy - Canbya Aurea S. Watson
- Golden Ragwort - Packera Aurea (L.) Á. Löve & D. Löve
- Golden Rimmed Navel Lichen - Rhizoplaca Chrysoleuca (Sm.) Zopf
- Golden Saxifrage - Chrysosplenium L.
- Golden Sedge - Carex Aurea Nutt.
- Golden Selenia - Selenia Aurea Nutt.
- Golden Shower - Cassia Fistula L.
- Golden Snakecactus - Bergerocactus Emoryi (Engelm.) Britton & Rose
- Golden Spiderflower - Cleome Platycarpa Torr.
- Golden Suncup - Camissonia Brevipes (A. Gray) P.H. Raven ssp. arizonica (P.H. Raven) P.H. Raven
- Golden Suncup - Camissonia Brevipes (A. Gray) P.H. Raven ssp. brevipes
- Golden Tiara Clematis - Clematis Tangutica (Maxim.) Korsh.
- Golden Tickseed - Coreopsis Tinctoria Nutt.
- Golden Tickseed - Coreopsis Tinctoria Nutt. var. similis (Boynt.) H.M. Parker
- Golden Tickseed - Coreopsis Tinctoria Nutt. var. tinctoria
- Golden Trumpet - Allamanda Cathartica L.
- Golden Violet - Viola Aurea Kellogg
- Golden Wattle - Acacia Pycnantha Benth.
- Golden Zizia - Zizia Aurea (L.) W.D.J. Koch
- Golden-yarrow - Eriophyllum Confertiflorum (DC.) A. Gray
- Golden-yarrow - Eriophyllum Confertiflorum (DC.) A. Gray var. confertiflorum
- Golden-yarrow - Eriophyllum Confertiflorum (DC.) A. Gray var. tanacetiflorum (Greene) Jeps.
- Goldenaster - Chrysopsis (nutt.) Elliott
- Goldenbanner - Thermopsis R. Br.
- Goldenbowl Mariposa Lily - Calochortus Concolor (Baker) Purdy
- Goldenbush - Ericameria Nutt.
- Goldenbush - Ericameria ×bolanderi (A. Gray) G.L. Nesom & Baird
- Goldenbush - Ericameria ×uintahensis (L.C. Anderson) G.L. Nesom & Baird
- Goldenbush - Ericameria ×viscosa (D.D. Keck) G.L. Nesom & Baird
- Goldenbush - Isocoma Nutt.
- Goldencarpet Buckwheat - Eriogonum Luteolum Greene
- Goldencarpet Buckwheat - Eriogonum Luteolum Greene var. luteolum
- Goldencarpet Buckwheat - Eriogonum Luteolum Greene var. pedunculatum (S. Stokes) Reveal
- Goldencarpet Buckwheat - Eriogonum Luteolum Greene var. saltuarium Reveal
- Goldencarpet - Gilmania Coville
- Goldencarpet - Gilmania Luteola (Coville) Coville
- Goldenclub - Orontium Aquaticum L.
- Goldenclub - Orontium L.
- Goldencrest - Lophiola Aurea Ker Gawl.
- Goldeneggs - Camissonia Ovata (Nutt. ex Torr. & A. Gray) P.H. Raven
- Goldeneye Phlox - Phlox Roemeriana Scheele
- Goldeneye - Viguiera Kunth
- Goldenfleece - Ericameria Arborescens (A. Gray) Greene
- Goldenflower Century Plant - Agave Chrysantha Peebles
- Goldenfruit Mistletoe - Phoradendron Anceps (Spreng.) G. Maza
- Goldenfruit Sedge - Carex Aureolensis Steud.
- Goldenhead - Acamptopappus (a. Gray) A. Gray
- Goldenheather - Hudsonia L.
- Goldenleaf Campylium Moss - Campylium Chrysophyllum (Brid.) J. Lange
- Goldenmane Tickseed - Coreopsis Basalis (A. Dietr.) S.F. Blake
- Goldenrain Tree - Koelreuteria Bipinnata Franchet
- Goldenrain Tree - Koelreuteria Paniculata Laxm.
- Goldenrain Wattle - Acacia Prominens A. Cunn. ex G. Don
- Goldenrod - Oligoneuron Small
- Goldenrod - Oligoneuron ×bernardii (B. Boivin) G.L. Nesom
- Goldenrod - Oligoneuron ×krotkovii (B. Boivin) G.L. Nesom
- Goldenrod - Oligoneuron ×lutescens (Lindl. ex DC.) G.L. Nesom
- Goldenrod - Oreochrysum Rydb.
- Goldenrod - Solidago L.
- Goldenrod - Solidago ×asperula Desf. (pro sp.)
- Goldenrod - Solidago ×bartramiana Fernald (pro sp.)
- Goldenrod - Solidago ×beaudryi B. Boivin
- Goldenrod - Solidago ×erskinei B. Boivin
- Goldenrod - Solidago ×ovata Friesner (pro sp.)
- Goldenrod - Solidago ×ulmicaesia Friesner
- Goldenseal - Hydrastis Canadensis L.
- Goldenstar - Bloomeria Kellogg
- Goldenthistle - Scolymus L.
- Goldenthread - Cuscuta Salina Engelm. var. major Yunck.
- Goldenthread - Cuscuta Salina Engelm. var. papillata Yunck.
- Goldentop - Euthamia Nutt. ex Cass.
- Goldentop Grass - Lamarckia Aurea (L.) Moench
- Goldentop Grass - Lamarckia Moench
- Goldentuft - Aurinia Petraea (Ard.) Schur
- Goldenwave Tickseed - Coreopsis Intermedia Sherff
- Goldenweed - Nestotus R.p. Roberts, Urbatsch & Neubig
- Goldenweed - Pyrrocoma Hook.
- Goldfields - Lasthenia Cass.
- Goldie's Woodfern - Dryopteris Goldieana (Hook. ex Goldie) A. Gray
- Goldilocks - Aster Linosyris (L.) Bernh.
- Goldman's Silktassel - Garrya Ovata Benth. ssp. goldmanii (Wooton & Standl.) Dahling
- Goldmoss Stonecrop - Sedum Acre L.
- Goldshower - Galphimia Cav.
- Goldthread - Coptis Salisb.
- Goldwire - Hypericum Concinnum Benth.
- Golf Club Moss - Catoscopium Brid.
- Gollania Densepinnata Dix.
- Gollania Moss - Gollania Broth.
- Gollania Moss - Gollania Turgens (Müll. Hal.) Ando
- Gomidesia - Gomidesia Berg
- Gomozia Granadensis L. f.
- Gomphia Ilicifolia DC.
- Gomphillus Lichen - Gomphillus Nyl.
- Gomphocarpus Cordifolius Benth.
- Gomphocarpus Fruticous (L.) W.T. Aiton
- Gomphocarpus Physocarpus E. Mey.
- Gomphrena Brasiliana L.
- Gomphrena Celosioides auct. non Mart.
- Gomphrena Decumbens Jacq.
- Gomphrena Dispersa Standl.
- Gomphrena Sessilis L.
- Gomphrena Tuberifera Torr.
- Gomphrena Viridis Wooton & Standl.
- Gongolin - Ilex Sideroxyloides (Sw.) Griseb.
- Gongolin - Ilex Sideroxyloides (Sw.) Griseb. var. occidentalis Loes.
- Gongolin - Ilex Sideroxyloides (Sw.) Griseb. var. sideroxyloides
- Gongylia Lichen - Gongylia Körb.
- Gongylia Lichen - Gongylia Muscorum Zschacke
- Gongylia Nadvornikii Servit
- Goniophlebium Triseriale (Sw.) Wherry
- Goniopteris Reptans (J.F. Gmel.) C. Presl
- Goniopteris Sclerophylla (Poepp. ex Spreng.) Wherry
- Goniopteris Tenera Fée
- Goniopteris Tetragona (Sw.) C. Presl
- Goniostachyum Citrosum Small
- Goniothalamus - Goniothalamus (blume) Hook. f. & Thomson
- Gonohymenia Cribellifera (Nyl.) Henssen
- Gonohymenia Melamphylla (Tuck.) Henssen
- Gonohymenia Minnesotensis (Fink) Henssen
- Gonohymenia Nigritella (Lettau) Henssen
- Gonolobus Arizonicus (A. Gray) Woodson
- Gonolobus Baldwynianus Sweet
- Gonolobus Biflorus Raf.
- Gonolobus Californicus Jeps.
- Gonolobus Carolinensis (Jacq.) R. Br. ex Schult., non Nutt.
- Gonolobus Cubensis A. Rich.
- Gonolobus Cynanchoides Engelm.
- Gonolobus Decipiens (Alexander) L.M. Perry
- Gonolobus Gonocarpos (Walter) L.M. Perry
- Gonolobus - Gonolobus Michx.
- Gonolobus Laevis Michx.
- Gonolobus Obliquus (Jacq.) R. Br. ex Schult.
- Gonolobus Parviflorus Torr. var. brevicoronatus B.L. Rob.
- Gonolobus Parvifolius Torr.
- Gonolobus Productus Torr.
- Gonolobus Reticulatus Engelm. ex A. Gray
- Gonolobus Sagittifolius A. Gray
- Gonolobus Shortii A. Gray
- Gonolobus Sintenisii Schltr.
- Gonolobus Suberosus auct. non (L.) R. Br.
- Gonolobus Variifolius Schltr.
- Gonopyrum Americanum Fisch. & C.A. Mey.
- Gonotheca Helianthoides (L.) Raf.
- Gonzalagunia - Gonzalagunia Ruiz & Pav.
- Gonzalagunia Spicata (Lam.) G. Maza
- Good King Henry - Chenopodium Bonus-henricus L.
- Goodding's Ash - Fraxinus Gooddingii Little
- Goodding's Bladderpod - Lesquerella Gooddingii Rollins & Shaw
- Goodding's Fameflower - Talinum Gooddingii P. Wilson
- Goodding's Onion - Allium Gooddingii Ownbey
- Goodding's Phacelia - Phacelia Pulchella A. Gray var. gooddingii (Brand) J.T. Howell
- Goodding's Tansyaster - Machaeranthera Pinnatifida (Hook.) Shinners ssp. gooddingii (A. Nelson) B.L. Turner & R.L.
- Goodding's Tansyaster - Machaeranthera Pinnatifida (Hook.) Shinners ssp. gooddingii (A. Nelson) B.L. Turner & R.L.
- Goodding's Tansyaster - Machaeranthera Pinnatifida (Hook.) Shinners ssp. gooddingii (A. Nelson) B.L. Turner & R.L.
- Goodding's Willow - Salix Gooddingii C.R. Ball
- Gooding's Gooseberry - Ribes Velutinum Greene var. gooddingii (M. Peck) C.L. Hitchc.
- Goodman's Buckwheat - Eriogonum Umbellatum Torr. var. goodmanii Reveal
- Goodrich Eared Rockcress - Arabis Goodrichii S.L. Welsh
- Goodrich's Blazingstar - Mentzelia Goodrichii Thorne & S.L. Welsh
- Goodyera Decipiens (Hook.) F.T. Hubbard
- Goodyera Oblongifolia Raf. var. reticulata B. Boivin
- Goodyera Ophioides (Fernald) Rydb.
- Goodyera Repens (L.) R. Br. ssp. ophioides (Fernald) Á. Löve & Simon
- Goodyera Repens (L.) R. Br. var. ophioides Fernald
- Goose Creek Milkvetch - Astragalus Anserinus N.D. Atwood, Goodrich & S.L. Welsh
- Goose Neck Moss - Rhytidiadelphus (lindb. ex Limpr.) Warnst.
- Goose Neck Moss - Rhytidiadelphus Loreus (Hedw.) Warnst.
- Goose Tongue - Plantago Maritima L.
- Goose Tongue - Plantago Maritima L. var. juncoides (Lam.) A. Gray
- Gooseberry Currant - Ribes Montigenum McClatchie
- Gooseberry Geranium - Pelargonium Grossularioides (L.) L'Hér. ex Aiton
- Gooseberry Gourd - Cucumis Myriocarpus E. Mey. ex Naud.
- Gooseberryleaf Alumroot - Heuchera Grossulariifolia Rydb.
- Gooseberryleaf Alumroot - Heuchera Grossulariifolia Rydb. var. grossulariifolia
- Gooseberryleaf Alumroot - Heuchera Grossulariifolia Rydb. var. tenuifolia (Wheelock) C.L. Hitchc.
- Gooseberryleaf Globemallow - Sphaeralcea Grossulariifolia (Hook. & Arn.) Rydb.
- Gooseberryleaf Globemallow - Sphaeralcea Grossulariifolia (Hook. & Arn.) Rydb. ssp. grossulariifolia
- Gooseberryleaf Globemallow - Sphaeralcea Grossulariifolia (Hook. & Arn.) Rydb. ssp. pedata (Torr. ex A. Gray) Kearney
- Goosefoot - Chenopodium L.
- Goosefoot - Chenopodium ×variabile Aellen
- Goosefoot Cornsalad - Valerianella Chenopodiifolia (Pursh) DC.
- Goosefoot Moonpod - Ammocodon Chenopodioides (A. Gray) Standl.
- Goosefoot Violet - Viola Purpurea Kellogg
- Goosefoot Violet - Viola Purpurea Kellogg ssp. dimorpha M.S. Baker & J.C. Clausen
- Goosefoot Violet - Viola Purpurea Kellogg ssp. geophyta M.S. Baker & J.C. Clausen
- Goosefoot Violet - Viola Purpurea Kellogg ssp. integrifolia M.S. Baker & J.C. Clausen
- Goosefoot Violet - Viola Purpurea Kellogg ssp. mesophyta M.S. Baker & J.C. Clausen
- Goosefoot Violet - Viola Purpurea Kellogg ssp. mohavensis (M.S. Baker & J.C. Clausen) J.C. Clausen
- Goosefoot Violet - Viola Purpurea Kellogg ssp. purpurea
- Goosefoot Violet - Viola Purpurea Kellogg ssp. quercetorum (M.S. Baker & J.C. Clausen) R.J. Little
- Goosefoot Violet - Viola Purpurea Kellogg ssp. venosa (S. Watson) M.S. Baker & J.C. Clausen
- Goosefoot Yellow Violet - Viola Pinetorum Greene
- Goosefoot Yellow Violet - Viola Pinetorum Greene var. grisea (Jepson) R.J. Little
- Goosefoot Yellow Violet - Viola Pinetorum Greene var. pinetorum
- Goosegrass - Acrachne Chiov.
- Goosegrass - Acrachne Racemosa (Roem. & Schult.) Ohwi
- Goosegrass - Eleusine Gaertn.
- Goosegrass Sedge - Carex Eleusinoides Turcz. ex C.A. Mey.
- Gooseneck Yellow Loosestrife - Lysimachia Clethroides Duby
- Gopher Apple - Licania Michauxii Prance
- Gophertail Lovegrass - Eragrostis Ciliaris (L.) R. Br.
- Gopherweed - Baptisia Lanceolata (Walter) Elliott
- Gopherweed - Baptisia Lanceolata (Walter) Elliott var. lanceolata
- Gordon's Bladderpod - Lesquerella Gordonii (A. Gray) S. Watson
- Gordon's Bladderpod - Lesquerella Gordonii (A. Gray) S. Watson var. densifolia Rollins
- Gordon's Bladderpod - Lesquerella Gordonii (A. Gray) S. Watson var. gordonii
- Gordon's Buckwheat - Eriogonum Gordonii Benth.
- Gordon's Ivesia - Ivesia Gordonii (Hook.) Torr. & A. Gray
- Gordon's Pritchardia - Pritchardia Gordonii Hodel
- Gordonia Alatamaha (W. Bartram ex Marshall) Sarg.
- Gordonia - Gordonia Ellis
- Gordonia Pubescens L'Hér.
- Gorge Fleabane - Erigeron Oreganus A. Gray
- Gorge Goldenrod - Solidago Faucibus Wieboldt
- Gorgojo - Curculigo Scorzonerifolia (Lam.) Baker
- Gorman's Aster - Eucephalus Gormanii Piper
- Gorman's Beardtongue - Penstemon Gormanii Greene
- Gorman's Biscuitroot - Lomatium Gormanii (Howell) J.M. Coult. & Rose
- Gorman's Buttercup - Ranunculus Gormanii Greene
- Gorman's Dwarf-primrose - Douglasia Gormanii Constance
- Gorman's Lupine - Lupinus Gormanii Piper
- Gorman's Saxifrage - Saxifraga Gormanii Suksd.
- Gormania Debilis (S. Watson) Britton
- Gormania Eastwoodiae Britton
- Gormania Glandulifera (L.F. Hend.) Abrams
- Gormania Laxa Britton
- Gormania Obtusata (A. Gray) Britton
- Gormania Oregana (Nutt.) Britton
- Gormania Retusa Rose
- Gormania Spathulifolia (Hook.) Á. Löve & D. Löve
- Gormania Watsonii Britton
- Gorse - Ulex L.
- Gorteria Linearis Thunb.
- Gossypianthus Lanuginosus (Poir.) Moq. var. sheldonii Uline & Bray
- Gossypianthus Rigidiflorus Hook.
- Gossypianthus Sheldonii (Uline & Bray) Small
- Gossypianthus Tenuiflorus Hook.
- Gossypium Barbadense L. var. acuminatum (Roxb. ex G. Don) Triana & Planch.
- Gossypium Brasiliense Macfad.
- Gossypium Herbaceum auct. non L.
- Gossypium Hirsutum L. var. punctatum (K. Schum. & Thonn.) Roberty
- Gossypium Mexicanum Tod.
- Gossypium Nanking Meyen
- Gossypium Peruvianum Cav.
- Gossypium Purpurascens Poir.
- Gossypium Sandvicense Parl.
- Gossypium Sturtii F. Muell.
- Gossypium Vitifolium Lam.
- Gouania Bishopii Hillebr.
- Gouania Cucullata H. St. John
- Gouania Faurieri H. St. John
- Gouania Gagnei H. St. John
- Gouania Hawaiiensis H. St. John
- Gouania Lydgatei H. St. John
- Gouania Mannii H. St. John
- Gouania Oliveri H. St. John
- Gouania Pilata H. St. John
- Gouania Remyi H. St. John
- Gouania Sandwichiana H. St. John
- Gouania Thinophila H. St. John
- Gouldia A. Gray
- Gouldia Affinis (DC.) Wilbur
- Gouldia Hillebrandii Fosberg
- Gouldia Hillebrandii Fosberg var. hawaiiensis Fosberg
- Gouldia Hillebrandii Fosberg var. nodosa Fosberg
- Gouldia Hirtella (A. Gray) Hillebr.
- Gouldia St.-johnii Fosberg
- Gouldia St.-johnii Fosberg var. munroi Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr.
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. angustifolia Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. antiqua Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. arborescens (Wawra) Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. aspera Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. bobeoides Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. congesta Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. cordata (Wawra) Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. coriacea (Hook. & Arn.) Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. crassicaulis Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. degeneri Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. elongata (A. Heller) Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. forbesii Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. glabra Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. hathewayi Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. hosakae Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. kaala Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. kapuaensis Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. konaensis Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. lanai Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. macrocarpa (Hillebr.) Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. macrothyrsa Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. myrsinoidea Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. osteocarpa Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. ovata (Wawra) Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. parvifolia (Wawra) Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. pedunculata Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. pseudodichotoma Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. pubescens Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. pubistipula Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. purpurea Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. quadrangularis Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. rotundifolia Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. sclerotica Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. skottsbergii Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. stipulacea (Wawra) Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. subcordata Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. tenuicaulis Fosberg
- Gouldia Terminalis (Hook. & Arn.) Hillebr. var. wawrana Fosberg
- Gourd - Cucurbita L.
- Gourka - Garcinia Dulcis (Roxb.) Kurz
- Gourliea Decorticans Gillies ex Hook. & Arn.
- Goutweed - Aegopodium L.
- Goutystalk Nettlespurge - Jatropha Podagrica Hook.
- Govenia - Govenia Lindl.
- Govenia Liliacea auct. non Lindl.
- Govenia Utriculata auct. non (Sw.) Lindl.
- Governor's Plum - Flacourtia Indica (Burm. f.) Merr.
- Gowen Cypress - Hesperocyparis Goveniana (Gordon) Bartel
- Graceful Bedstraw - Galium Porrigens Dempster
- Graceful Bedstraw - Galium Porrigens Dempster var. porrigens
- Graceful Bedstraw - Galium Porrigens Dempster var. tenue (Dempster) Dempster
- Graceful Buckwheat - Eriogonum Verrucosum Reveal
- Graceful Buttercup - Ranunculus Inamoenus Greene
- Graceful Buttercup - Ranunculus Inamoenus Greene var. alpeophilus (A. Nelson) L.D. Benson
- Graceful Buttercup - Ranunculus Inamoenus Greene var. inamoenus
- Graceful Buttercup - Ranunculus Inamoenus Greene var. subaffinis (A. Gray) L.D. Benson
- Graceful Cinquefoil - Potentilla Gracilis Douglas ex Hook. var. gracilis
- Graceful False Flax - Camelina Rumelica Velen.
- Graceful Fern - Niphidium Crassifolium (L.) Lellinger
- Graceful Fern - Niphidium J. Sm.
- Graceful Filmy Fern - Hymenophyllum Fucoides (Sw.) Sw.
- Graceful Hawthorn - Crataegus Thermopegaea Palmer
- Graceful Johnnyberry - Miconia Tetrastoma Naud.
- Graceful Kihifern - Adenophorus Pinnatifidus Gaudich.
- Graceful Lipfern - Cheilanthes Yavapensis Reeves ex Windham
- Graceful Maiden Fern - Thelypteris Pennata (Poir.) Morton
- Graceful Midsorus Fern - Blechnum Insularum Morton & Lellinger
- Graceful Mimosa - Mimosa Casta L.
- Graceful Necklace Fern - Lindsaea Ensifolia Sw.
- Graceful Peperomia - Peperomia Obovatilimba C. DC.
- Graceful Pouzolzsbush - Pouzolzia Zeylanica (L.) Benn.
- Graceful Sandmat - Chamaesyce Hypericifolia (L.) Millsp.
- Graceful Sedge - Carex Gracillima Schwein.
- Graceful Tonguefern - Elaphoglossum Petiolatum (Sw.) Urb.
- Graceful Wattle - Acacia Decora Rchb.
- Graceful Wattle - Acacia Gracilifolia Maiden & Blakely
- Gracilariopsis - Gracilariopsis Chorda (Holmes) Ohmi
- Gracilariopsis - Gracilariopsis E.y. Dawson
- Graffenrieda - Graffenrieda Dc.
- Graham's Manihot - Manihot Grahamii Hook.
- Graham's Mimosa - Mimosa Grahamii A. Gray
- Graham's Nipple Cactus - Mammillaria Grahamii Engelm.
- Graham's Pricklypear - Grusonia Grahamii (Engelm.) H. Rob.
- Graham's Thistle - Cirsium Grahamii A. Gray
- Graham's Ticktrefoil - Desmodium Grahamii A. Gray
- Graham's Twinpod - Physaria Grahamii Morton
- Graham's Willow - Salix ×grahamii Borrer ex Baker
- Grahm's Columbine - Aquilegia Grahamii S.L. Welsh & Goodrich
- Grain Sorghum - Sorghum Bicolor (L.) Moench ssp. bicolor
- Grainfield Spurge - Euphorbia Segetalis L.
- Grama - Bouteloua Lag.
- Grammadenia Sintenisii (Urb.) Mez
- Grammica Campestris (Yunck.) Hadac & Chrtek
- Grammica Cephalanthi (Engelm.) Hadac & Chrtek
- Grammica Coryli (Engelm.) Hadac & Chrtek
- Grammica Cuspidata (Engelm.) Hadac & Chrtek
- Grammica Denticulata (Engelm.) W.A. Weber
- Grammica Gronovii (Willd. ex Schult.) Hadac & Chrtek
- Grammica Indecora (Choisy) W.A. Weber
- Grammica Indecora (Choisy) W.A. Weber ssp. neuropetala (Engelm.) W.A. Weber
- Grammica Occidentalis (Millsp.) Hadac & Chrtek
- Grammica Pentagona (Engelm.) W.A. Weber
- Grammica Salina (Engelm.) Roy L. Taylor & MacBryde
- Grammica Umbellata (Kunth) Hadac & Chrtek
- Grammica Umbrosa auct. non (Bey. ex Hook.) W.A. Weber
- Grammitis Anfractuosa (Kunze ex Klotzsch) Proctor
- Grammitis Flabelliformis (Poir.) Morton
- Grammitis Hartii (Jenman) Proctor
- Grammitis Jubiformis (Kaulf.) Proctor
- Grammitis Jungens (Bishop) Proctor
- Grammitis Limbata auct. non Fée
- Grammitis Myosuroides (Sw.) Sw.
- Grammitis Oahuensis Copeland
- Grammitis Palauensis Hosok.
- Grammitis Rostrata (Hook.) R.M. Tryon & A.F. Tryon
- Grammitis Saffordii (Maxon) C. Morton
- Grammitis Sectifrons (Kunze ex Mett.) Seymour
- Grammitis Seminuda (Willd.) Willd.
- Grammitis Serrulata (Sw.) Sw.
- Grammitis Suspensa (L.) Proctor
- Grammitis Taenifolia (Jenman) Proctor
- Grammitis Trifurcata (L.) Copeland
- Grampians Gum - Eucalyptus Alpina Lindl.
- Granadillo Bobo - Miconia Prasina (Sw.) DC.
- Grand Buckwheat - Eriogonum Contortum Small
- Grand Canyon Blazingstar - Mentzelia Canyonensis J.J. Schenk, W.C. Hodgs., & L. Hufford
- Grand Canyon Campion - Silene Rectiramea B.L. Rob.
- Grand Canyon Century Plant - Agave Phillipsiana W.C. Hodgson
- Grand Canyon Glowweed - Hesperodoria Scopulorum (M.E. Jones) Greene
- Grand Canyon Rockdaisy - Perityle Congesta (M.E. Jones) Shinners
- Grand Canyon Suncup - Camissonia Confertiflora (P.H. Raven) P.H. Raven
- Grand Collomia - Collomia Grandiflora Douglas ex Lindl.
- Grand Coulee Onion - Allium Constrictum (Ownbey & Mingrone) P. Peterson, Annable & Rieseberg
- Grand Coulee Owl's-clover - Orthocarpus Barbatus Cotton
- Grand Devil's-claws - Pisonia Grandis R. Br.
- Grand Eucalyptus - Eucalyptus Grandis W. Hill ex Maid.
- Grand Fir - Abies Grandis (Douglas ex D. Don) Lindl.
- Grand Fringed Gentian - Gentianopsis Macrantha (D. Don ex G. Don) Iltis
- Grand Hawthorn - Crataegus Grandis Ashe
- Grand Junction Camissonia - Camissonia Eastwoodiae (Munz) P.H. Raven
- Grand Junction Cryptantha - Cryptantha Aperta (Eastw.) Payson
- Grand Junction Milkvetch - Astragalus Linifolius Osterh.
- Grand Lake Blackberry - Rubus Navus L.H. Bailey
- Grand Merisier - Gomidesia Lindeniana Berg
- Grand Paspalum - Paspalum Pulchellum Kunth
- Grand Peperomia - Peperomia Robustior Urb.
- Grand Rapids Hawthorn - Crataegus Ambitiosa Sarg.
- Grand Redstem - Ammannia Robusta Heer & Regel
- Grand Snow Lichen - Stereocaulon Grande (H. Magn.) H. Magn.
- Grandcousin - Triumfetta Lappula L.
- Grandleaf Rhizomnium Moss - Rhizomnium Magnifolium (Horik.) T. Kop.
- Grandleaf Seagrape - Coccoloba Pubescens L.
- Granite Buckwheat - Eriogonum Robustum Greene
- Granite Draba - Draba Lemmonii S. Watson
- Granite Draba - Draba Lemmonii S. Watson var. cyclomorpha (Payson) O.E. Schulz
- Granite Draba - Draba Lemmonii S. Watson var. lemmonii
- Granite Flatsedge - Cyperus Granitophilus McVaugh
- Granite Gooseberry - Ribes Curvatum Small
- Granite Hedgehyssop - Gratiola Graniticola D. Estes
- Granite Mousetail - Ivesia Muirii A. Gray
- Granite Prickly Phlox - Linanthus Pungens (Torr.) J.M. Porter & L.A. Johnson
- Granite Serpentweed - Tonestus Graniticus (Tiehm & L.M. Shultz) G.L. Nesom & D. Morgan
- Granite Stonecrop - Sedum Pusillum Michx.
- Grannybush - Croton Cascarilla (L.) L.
- Grannyvine - Ipomoea Tricolor Cav.
- Grant's Rattlebox - Crotalaria Virgulata Klotzsch ssp. grantiana (Harv.) Polhill
- Grant's Sedge - Carex ×grantii A. Benn.
- Grant's Splendid Woodland-gilia - Saltugilia Splendens (Douglas ex H. Mason & A.D. Grant) L.A. Johnson ssp. grantii (Br
- Grants Pass Lupine - Lupinus Fissicalyx A. Heller
- Grants Pass Willowherb - Epilobium Oreganum Greene
- Granular Lichen - Lopadium Körb.
- Granular Lichen - Lopadium Pezizoideum (Ach.) Körb.
- Granular Trapeliopsis Lichen - Trapeliopsis Granulosa (Hoffm.) Lumbsch
- Granule Earth Lichen - Catapyrenium Granulosum (de Lesd.) J.W. Thomson
- Granulopyrenis Aptroot
- Granulopyrenis Hymnothora (Ach.) Aptroot
- Granulose Orange Lichen - Caloplaca Granulosa (Müll. Arg.) Jatta
- Grape Honeysuckle - Lonicera Reticulata Raf.
- Grape Hyacinth - Muscari Mill.
- Grape Ivy - Cissus Rhombifolia Vahl
- Grape Soda Lupine - Lupinus Excubitus M.E. Jones
- Grape Soda Lupine - Lupinus Excubitus M.E. Jones var. excubitus
- Grape - Vitis L.
- Grape - Vitis ×doaniana Munson ex Viala (pro sp.)
- Grapefern - Botrychium Sw.
- Grapefern - Botrychium Tunux Stensvold & Farrar
- Grapefern - Botrychium Yaaxudakeit Stensvold & Farrar
- Grapefern - Sceptridium Lyon
- Grapefruit - Citrus ×paradisi Macfad. (pro sp.)
- Grapeleaf Begonia - Begonia Reniformis Dryand.
- Grapeleaf Geranium - Pelargonium Vitifolium (L.) L'Hér. ex Aiton
- Graphephorum Melicoides (Michx.) Desv.
- Graphephorum Wolfii (Vasey) Vasey ex J.M. Coult.
- Graphidium Aphthosae Alstrup & D. Hawksw.
- Graphidium Corda
- Graphina Acrophaea Müll. Arg.
- Graphina Adscribens (Nyl.) Müll. Arg.
- Graphina Antillarum (Vain.) Zahlbr.
- Graphina Floridana (Tuck.) R.C. Harris
- Graphina Glaucoderma (Nyl.) Müll. Arg.
- Graphina Intertexta (Müll. Arg.) R.C. Harris
- Graphina Leprocarpa (Nyl.) Zahlbr.
- Graphina Lichen - Graphina Abaphoides (Nyl.) Müll. Arg.
- Graphina Lichen - Graphina Anguina (Mont.) Müll. Arg.
- Graphina Lichen - Graphina Colliculosa (Mont.) Hale
- Graphina Lichen - Graphina Columbina (Tuck.) M. Wirth & Hale
- Graphina Lichen - Graphina Incrustans (Fée) Müll. Arg.
- Graphina Lichen - Graphina Leuconephala (Nyl.) Zahlbr.
- Graphina Lichen - Graphina Marescens (Fée) Müll. Arg.
- Graphina Lichen - Graphina Müll. Arg.
- Graphina Lichen - Graphina Parilis (Krempelh.) Müll. Arg.
- Graphina Lichen - Graphina Playtleuca (Nyl.) Zahlbr.
- Graphina Lichen - Graphina Scolectis (Tuck.) Fink
- Graphina Lichen - Graphina Subnitida (Nyl.) Zahlbr.
- Graphina Lichen - Graphina Substriatula (Nyl.) Zahlbr.
- Graphina Lichen - Graphina Subvirginalis (Nyl.) Müll. Arg.
- Graphina Lichen - Graphina Virginea (Eschw.) Müll. Arg.
- Graphina Nitidescens (Nyl.) Riddle
- Graphina Peplophora M. Wirth & Hale
- Graphina Plittii Zahlbr.
- Graphina Subnitidula (Nyl.) Zahlbr.
- Graphina Virginalis (Nyl.) Müll. Arg.
- Graphina Xylophaga R.C. Harris
- Graphis Anfractuosa Eschw.
- Graphis Atrorubens Tuck. ex Fink
- Graphis Beaumontii Tuck.
- Graphis Candidata Nyl.
- Graphis Celtidis Müll. Arg.
- Graphis Chromothecia R.C. Harris
- Graphis Eulectra Tuck.
- Graphis Floridana Tuck.
- Graphis Grammatis Fée
- Graphis Haleana R.C. Harris
- Graphis Illiterata R.C. Harris
- Graphis Intertexta Müll. Arg.
- Graphis Inversa R.C. Harris
- Graphis Leptocarpa Fée
- Graphis Librata C. Knight
- Graphis Lucifica R.C. Harris
- Graphis Lumbricina Vain.
- Graphis Nitida (Eschw.) Tuck.
- Graphis Saxorum Egea & Torrente
- Graphis Subelegans Nyl.
- Grapplinghook - Harpagonella A. Gray
- Graptopetalum Orpetii E. Walther
- Graptophyllum - Graptophyllum Nees
- Grass Blazingstar - Mentzelia Gracilenta Torr. & A. Gray
- Grass Fern - Vittaria Graminifolia Kaulf.
- Grass Milkvetch - Astragalus Chloodes Barneby
- Grass Of Parnassus - Parnassia L.
- Grass Orchid - Eulophia Spectabilis (Dennst.) Suresh
- Grass Pea - Lathyrus Nissolia L.
- Grass Pea - Lathyrus Sphaericus Retz.
- Grass-leaved Rock Goldenrod - Petradoria Pumila (Nutt.) Greene ssp. graminea (Wooton & Standl.) L.C. Anderson
- Grass-like Mock Goldenweed - Stenotus Armerioides Nutt. var. gramineus (S.L. Welsh & F.J. Sm.) Kartesz & Gandhi
- Grass-like Sedge - Carex Panicea L.
- Grass-like Starwort - Stellaria Graminea L.
- Grassflower - Gesneria Viridiflora (Decne.) Kuntze
- Grassflower - Gesneria Viridiflora (Decne.) Kuntze ssp. sintenisii (Urb.) L. Skog
- Grassland Beggarticks - Bidens Micrantha Gaudich.
- Grassland Beggarticks - Bidens Micrantha Gaudich. ssp. ctenophylla (Sherff) Nagata & Ganders
- Grassland Beggarticks - Bidens Micrantha Gaudich. ssp. micrantha
- Grassland Blazingstar - Mentzelia Strictissima (Wooton & Standl.) J. Darl.
- Grassland Croton - Croton Dioicus Cav.
- Grassland Lady's Mantle - Alchemilla Wichurae (Buser) Stefansson
- Grassland Nehe - Lipochaeta Subcordata A. Gray
- Grassland Pricklypear - Opuntia Cymochila Engelm. & J.M. Bigelow
- Grassland Sedge - Carex Divulsa Stokes
- Grassland Sedge - Carex Divulsa Stokes ssp. divulsa
- Grassland Silverpuffs - Microseris Heterocarpa (Nutt.) K.L. Chambers
- Grassland Suncup - Camissonia Lacustris P.H. Raven
- Grassland Tarweed - Deinandra Increscens (H.M. Hall ex D.D. Keck) B.G. Baldw.
- Grassland Tarweed - Deinandra Increscens (H.M. Hall ex D.D. Keck) B.G. Baldw. ssp. foliosa (Hoover) B.G.
- Grassland Tarweed - Deinandra Increscens (H.M. Hall ex D.D. Keck) B.G. Baldw. ssp. increscens
- Grassleaf Barbara's Buttons - Marshallia Graminifolia (Walter) Small
- Grassleaf Barbara's Buttons - Marshallia Graminifolia (Walter) Small var. cynanthera (Elliott) Beadle & F.E. Boynt.
- Grassleaf Barbara's Buttons - Marshallia Graminifolia (Walter) Small var. graminifolia
- Grassleaf Coneflower - Rudbeckia Graminifolia (Torr. & A. Gray) C.L. Boynt. & Beadle
- Grassleaf Goldaster - Pityopsis Oligantha (Chapm. ex Torr. & A. Gray) Small
- Grassleaf Lettuce - Lactuca Graminifolia Michx.
- Grassleaf Lettuce - Lactuca Graminifolia Michx. var. arizonica McVaugh
- Grassleaf Lettuce - Lactuca Graminifolia Michx. var. graminifolia
- Grassleaf Mudplantain - Heteranthera Dubia (Jacq.) MacMill.
- Grassleaf Orache - Atriplex Littoralis L.
- Grassleaf Orchid - Koellensteinia Graminea (Lindl.) Rchb. f.
- Grassleaf Pea - Lathyrus Graminifolius (S. Watson) T.G. White
- Grassleaf Pepperweed - Lepidium Graminifolium L.
- Grassleaf Roseling - Callisia Graminea (Small) G. Tucker
- Grassleaf Rush - Juncus Marginatus Rostk.
- Grassleaf Sedge - Carex Agrostoides Mack.
- Grassleaf Sorrel - Rumex Graminifolius Georgi ex Lamb.
- Grassleaf Springbeauty - Claytonia Eschscholtzii Cham.
- Grassleaf Spurge - Euphorbia Graminea Jacq.
- Grassleaf Sweet Flag - Acorus Gramineus Sol. ex Aiton
- Grassleaf Ticktrefoil - Desmodium Gramineum A. Gray
- Grassleaf Yellow Loosestrife - Lysimachia Graminea (Greene) Hand.-Maz.
- Grassnut - Arachis Prostrata Benth.
- Grasspink - Calopogon R. Br.
- Grasswidow - Olsynium Raf.
- Grasswort - Lilaeopsis Greene
- Grassy Arrowhead - Sagittaria Graminea Michx.
- Grassy Arrowhead - Sagittaria Graminea Michx. var. graminea
- Grassy Deathcamas - Zigadenus Venenosus S. Watson var. gramineus (Rydb.) Walsh ex M. Peck
- Grassy St. Johnswort - Hypericum Gramineum G. Forst.
- Grassy Tarweed - Madia Gracilis (Sm.) D.D. Keck
- Grassyslope Arctic Sedge - Carex Anthoxanthea J. Presl & C. Presl
- Grassyslope Sedge - Carex Oreocharis T. Holm
- Grateloupia - Grateloupia Asiatica S. Kawaguchi & H.W. Wang
- Grateloupia - Grateloupia C. Agardh
- Gratiola Amphiantha D. Estes & R.L. Small
- Gratiola Aurea Pursh var. obtusa Pennell
- Gratiola Dubia L.
- Gratiola Lutea Raf.
- Gratiola Neglecta Torr. var. glaberrima Fernald
- Gratiola Pilosa Michx. var. epilis Pennell
- Gratiola Repens Sw.
- Gratiola Sphaerocarpa Elliott
- Gratiola Subulata Baldw. ex Benth.
- Gratiola Viscidula Pennell ssp. shortii Durand ex Pennell
- Gratiola Viscidula Pennell var. shortii (Durand ex Pennell) Gleason
- Gratiola Viscosa Schwein.
- Gravel Milkvetch - Astragalus Sabulonum A. Gray
- Gravelbar Brickellbush - Brickellia Cylindracea A. Gray & Engelm.
- Gravelbar Cryptantha - Cryptantha Decipiens (M.E. Jones) A. Heller
- Gravelbar Muhly - Muhlenbergia Eludens C.G. Reeder
- Gravelweed - Verbesina Helianthoides Michx.
- Graves' Blackberry - Rubus Allegheniensis Porter var. gravesii Fernald
- Graves' Plum - Prunus Maritima Marshall var. gravesii (Small) G.J. Anderson
- Gray Alder - Alnus Incana (L.) Moench
- Gray Alder - Alnus Incana (L.) Moench ssp. incana (L.) Moench [excluded]
- Gray Aster - Eurybia Glauca (Nutt.) G.L. Nesom
- Gray Aster - Eurybia Glauca (Nutt.) G.L. Nesom var. glauca
- Gray Birch - Betula Populifolia Marshall
- Gray Bottlebrush - Callistemon Speciosus (Bonpl.) Sweet
- Gray Buckwheat - Eriogonum Villiflorum A. Gray
- Gray Bushmallow - Malacothamnus Aboriginum (B.L. Rob.) Greene
- Gray Chickensage - Sphaeromeria Cana (D.C. Eaton) A. Heller
- Gray Chickweed - Cerastium Brachypetalum Pers.
- Gray Clubawn Grass - Corynephorus Canescens (L.) P. Beauv.
- Gray Cryptantha - Cryptantha Leucophaea (Douglas ex Lehm.) Payson
- Gray Dogwood - Cornus Racemosa Lam.
- Gray Everlasting - Gamochaeta Coarctata (Willd.) Kerguélen
- Gray Field Speedwell - Veronica Polita Fr.
- Gray Five Eyes - Chamaesaracha Coniodes (Moric. ex Dunal) Britton
- Gray Globemallow - Sphaeralcea Incana Torr. ex A. Gray
- Gray Globemallow - Sphaeralcea Incana Torr. ex A. Gray ssp. incana
- Gray Goldenrod - Solidago Nemoralis Aiton
- Gray Goldenrod - Solidago Nemoralis Aiton var. longipetiolata (Mack. & Bush) Palmer & Steyerm.
- Gray Goldenrod - Solidago Nemoralis Aiton var. nemoralis
- Gray Gum - Eucalyptus Propinqua H. Deane & Maiden
- Gray Gum - Eucalyptus Punctata DC.
- Gray Honeymyrtle - Melaleuca Incana R. Br.
- Gray Ironbark - Eucalyptus Paniculata Sm.
- Gray Mallee - Eucalyptus Morrisii R.T. Baker
- Gray Mangrove - Avicennia Marina (Forssk.) Vierh.
- Gray Mangrove - Avicennia Marina (Forssk.) Vierh. var. resinifera (G. Forst.) Bakh.
- Gray Monardella - Monardella Cinerea Abrams
- Gray Mulga - Acacia Brachybotrya Benth.
- Gray Nicker - Ticanto Adans.
- Gray Nicker - Ticanto Nuga (L.) Medik.
- Gray Oak - Quercus Grisea Liebm.
- Gray Pine Dwarf Mistletoe - Arceuthobium Occidentale Engelm.
- Gray Poplar - Populus ×canescens (Aiton) Sm. (pro sp.)
- Gray Pubescent Plantain - Plantago Canescens M.F. Adams
- Gray Rockdaisy - Perityle Cinerea (A. Gray) A. Powell
- Gray Rupturewort - Herniaria Incana Lam.
- Gray Saltbush - Atriplex Cinerea Poir.
- Gray Sheoak - Casuarina Glauca Siebold ex Spreng.
- Gray Springparsley - Cymopterus Cinerarius A. Gray
- Gray Stickseed - Hackelia Cinerea (Piper) I.M. Johnst.
- Gray Vervain - Verbena Canescens Kunth
- Gray's Angelica - Angelica Grayi (J.M. Coult. & Rose) J.M. Coult. & Rose
- Gray's Aster - Symphyotrichum Subspicatum (Nees) G.L. Nesom var. grayi (Suksd.) G.L. Nesom
- Gray's Beaksedge - Rhynchospora Grayi Kunth
- Gray's Bean - Phaseolus Pedicellatus Benth. var. grayanus (Wooton & Standl.) A. Delgado ex Isely
- Gray's Bedstraw - Galium Grayanum Ehrend.
- Gray's Bedstraw - Galium Grayanum Ehrend. var. grayanum
- Gray's Bedstraw - Galium Grayanum Ehrend. var. nanum Dempster & Ehrend.
- Gray's Biscuitroot - Lomatium Grayi (J.M. Coult. & Rose) J.M. Coult. & Rose
- Gray's Biscuitroot - Lomatium Grayi (J.M. Coult. & Rose) J.M. Coult. & Rose var. depauperatum (M.E.
- Gray's Biscuitroot - Lomatium Grayi (J.M. Coult. & Rose) J.M. Coult. & Rose var. grayi
- Gray's Broomrape - Orobanche Californica Cham. & Schltdl. ssp. grayana (G. Beck) Heckard
- Gray's Bur Cucumber - Sicyos Cucumerinus A. Gray
- Gray's Catchfly - Silene Grayi S. Watson
- Gray's Cinquefoil - Potentilla Grayi S. Watson
- Gray's Cloak Fern - Notholaena Grayi Davenport
- Gray's Cloak Fern - Notholaena Grayi Davenport ssp. grayi
- Gray's Cup Lichen - Cladonia Grayi G. Merr. ex Sandst.
- Gray's Cyrtandra - Cyrtandra Grayi C.B. Clarke
- Gray's Draba - Draba Grayana (Rydb.) C.L. Hitchc.
- Gray's Feverfew - Parthenium Confertum A. Gray
- Gray's Flatsedge - Cyperus Grayi Torr.
- Gray's Fritillary - Fritillaria Grayana Rchb. f. & Baker
- Gray's Licorice-root - Ligusticum Grayi J.M. Coult. & Rose
- Gray's Lily - Lilium Grayi S. Watson
- Gray's Milkpea - Galactia Heterophylla A. Gray
- Gray's Milkvetch - Astragalus Grayi Parry ex S. Watson
- Gray's Prairie Clover - Dalea Grayi (Vail) L.O. Williams
- Gray's Seablush - Plectritis Macrocera Torr. & A. Gray ssp. grayi (Suksd.) Morey
- Gray's Sedge - Carex Grayi Carey
- Gray's Townsend Daisy - Townsendia Glabella A. Gray
- Gray-box - Eucalyptus Moluccana Roxb.
- Gray-woolly Twintip - Stemodia Lanata Sessé & Moc. ex Benth.
- Graybark Grape - Vitis Cinerea (Engelm.) Engelm. ex Millard
- Graybark Grape - Vitis Cinerea (Engelm.) Engelm. ex Millard var. baileyana (Munson) Comeaux
- Graybark Grape - Vitis Cinerea (Engelm.) Engelm. ex Millard var. cinerea
- Graybark Grape - Vitis Cinerea (Engelm.) Engelm. ex Millard var. tomentosa (Planch.) Comeaux
- Graybeard Hedgehog Cactus - Echinocereus Viridiflorus Engelm. var. canus A.M. Powell & Weedin
- Graygreen Maiden Fern - Thelypteris Nephrodioides (Klotzsch) Proctor
- Graygreen Thistle - Cirsium Canovirens (Rydb.) Petr.
- Grayhairy Wild Indigo - Baptisia Cinerea (Raf.) Fernald & B.G. Schub.
- Grayia Brandegeei A. Gray
- Grayia Brandegeei A. Gray var. plummeri Stutz & S.C. Sand.
- Graying Clover - Trifolium Canescens Willd.
- Grayleaf Draba - Draba Cinerea M.F. Adams
- Grayleaf Lobelia - Lobelia Remyi Rock
- Grayleaf Milkwort - Polygala Polifolia C. Presl
- Grayleaf Phlox - Phlox Griseola Wherry
- Grayleaf Phlox - Phlox Griseola Wherry ssp. griseola
- Grayleaf Red Raspberry - Rubus Idaeus L. ssp. strigosus (Michx.) Focke
- Grayleaf Skullcap - Scutellaria Siphocampyloides Vatke
- Grayleaf Willow - Salix Glauca L.
- Grayleaf Willow - Salix Glauca L. ssp. callicarpaea (Trautv.) Böcher
- Grayleaf Willow - Salix Glauca L. ssp. glauca
- Grayleaf Willow - Salix Glauca L. ssp. glauca var. acutifolia (Hook.) C.K. Schneid.
- Grayleaf Willow - Salix Glauca L. ssp. glauca var. glauca
- Grayleaf Willow - Salix Glauca L. ssp. glauca var. villosa (D. Don ex Hook.) Andersson
- Grayleaf Willow - Salix Glauca L. ssp. stipulifera (Flod. ex Hayren) Hiitonen
- Graylocks Four-nerve Daisy - Tetraneuris Grandiflora (Torr. & A. Gray ex A. Gray) K.F. Parker
- Greasebush - Glossopetalon A. Gray
- Greasewood - Sarcobatus Nees
- Greasewood - Sarcobatus Vermiculatus (Hook.) Torr.
- Great Basin Bristlecone Pine - Pinus Longaeva D.K. Bailey
- Great Basin Brome - Bromus Polyanthus Scribn. ex Shear
- Great Basin Brome - Bromus Polyanthus Scribn. ex Shear var. paniculatus Shear
- Great Basin Brome - Bromus Polyanthus Scribn. ex Shear var. polyanthus
- Great Basin Calicoflower - Downingia Laeta (Greene) Greene
- Great Basin Desert Buckwheat - Eriogonum Desertorum (Maguire) R.J. Davis
- Great Basin Desertparsley - Lomatium Simplex (Nutt.) J.F. Macbr.
- Great Basin Desertparsley - Lomatium Simplex (Nutt.) J.F. Macbr. var. simplex
- Great Basin Fishhook Cactus - Sclerocactus Pubispinus (Engelm.) L.D. Benson
- Great Basin Indian Potato - Orogenia Linearifolia S. Watson
- Great Basin Langloisia - Langloisia Setosissima (Torr. & A. Gray ex Torr.) Greene
- Great Basin Langloisia - Langloisia Setosissima (Torr. & A. Gray ex Torr.) Greene ssp. punctata (A. Gray ex Covi
- Great Basin Langloisia - Langloisia Setosissima (Torr. & A. Gray ex Torr.) Greene ssp. setosissima
- Great Basin Lupine - Lupinus ×alpestris A. Nelson (pro sp.)
- Great Basin Popcornflower - Plagiobothrys Kingii (S. Watson) A. Gray
- Great Basin Popcornflower - Plagiobothrys Kingii (S. Watson) A. Gray var. kingii
- Great Basin Springbeauty - Claytonia Umbellata S. Watson
- Great Basin Tumblemustard - Thelypodiopsis Vermicularis (S.L. Welsh & Reveal) Rollins
- Great Basin Woollystar - Eriastrum Sparsiflorum (Eastw.) H. Mason
- Great Basin Woollystar - Eriastrum Sparsiflorum (Eastw.) H. Mason ssp. sparsiflorum
- Great Bladdery Milkvetch - Astragalus Megacarpus (Nutt.) A. Gray
- Great Blue Lobelia - Lobelia Siphilitica L.
- Great Blue Lobelia - Lobelia Siphilitica L. var. ludoviciana A. DC.
- Great Blue Lobelia - Lobelia Siphilitica L. var. siphilitica
- Great Bougainvillea - Bougainvillea Spectabilis Willd.
- Great Britain Blackberry - Rubus Thyrsoides Wimm.
- Great Burnet - Sanguisorba Officinalis L.
- Great Chickweed - Cerastium Maximum L.
- Great Coneflower - Rudbeckia Maxima Nutt.
- Great False Leopardbane - Doronicum Pardalianches L.
- Great Fern - Diplazium Expansum Willd.
- Great Globethistle - Echinops Sphaerocephalus L.
- Great Indian Plantain - Arnoglossum Reniforme (Hook.) H. Rob.
- Great Lakes Dewberry - Rubus Perspicuus L.H. Bailey
- Great Lakes Sandcherry - Prunus Pumila L. var. pumila
- Great Lakes Wheatgrass - Elymus Lanceolatus (Scribn. & J.G. Sm.) Gould ssp. psammophilus (J.M. Gillett & H.
- Great Laurel - Rhododendron Maximum L.
- Great Leadtree - Leucaena Pulverulenta (Schltdl.) Benth.
- Great Plains Bladderpod - Lesquerella Arenosa (Richardson) Rydb.
- Great Plains Bladderpod - Lesquerella Arenosa (Richardson) Rydb. var. arenosa
- Great Plains Bladderpod - Lesquerella Arenosa (Richardson) Rydb. var. argillosa Rollins & Shaw
- Great Plains Flatsedge - Cyperus Lupulinus (Spreng.) Marcks
- Great Plains Flatsedge - Cyperus Lupulinus (Spreng.) Marcks ssp. lupulinus
- Great Plains Flatsedge - Cyperus Lupulinus (Spreng.) Marcks ssp. macilentus (Fernald) Marcks
- Great Plains Lady's Tresses - Spiranthes Magnicamporum Sheviak
- Great Plains Ragwort - Packera Tampicana (DC.) C. Jeffrey
- Great Plains Sedge - Carex Melanostachya M. Bieb. ex Willd.
- Great Plains Stickseed - Lappula Cenchrusoides A. Nelson
- Great Plains White Fringed Orchid - Platanthera Praeclara Sheviak & Bowles
- Great Ragweed - Ambrosia Trifida L.
- Great Ragweed - Ambrosia Trifida L. var. trifida
- Great Sage - Salvia Summa A. Nelson
- Great Smoky Mountain Hawthorn - Crataegus Penita Beadle
- Great Smoky Mountain Mannagrass - Glyceria Nubigena W.A. Anderson
- Great Smoky Mountain Sedge - Carex Proposita Mack.
- Great St. Johnswort - Hypericum Ascyron L.
- Great Valley Eryngo - Eryngium Castrense Jeps.
- Great Valley Gumweed - Grindelia Camporum Greene
- Great Valley Gumweed - Grindelia Camporum Greene var. camporum
- Great Valley Phacelia - Phacelia Ciliata Benth.
- Great Valley Phacelia - Phacelia Ciliata Benth. var. ciliata
- Great Valley Phacelia - Phacelia Ciliata Benth. var. opaca J.T. Howell
- Great Waterleaf - Hydrophyllum Appendiculatum Michx.
- Great Yellow Woodsorrel - Oxalis Grandis Small
- Great Yellowcress - Rorippa Amphibia (L.) Besser
- Greata's Aster - Symphyotrichum Greatae (Parish) G.L. Nesom
- Greater Bladder Sedge - Carex Intumescens Rudge
- Greater Brown Sedge - Carex Brunnea Thunb.
- Greater Burdock - Arctium Lappa L.
- Greater Creeping Rush - Juncus Subtilis E. Mey.
- Greater Creeping Spearwort - Ranunculus Flammula L.
- Greater Creeping Spearwort - Ranunculus Flammula L. var. filiformis (Michx.) Hook.
- Greater Creeping Spearwort - Ranunculus Flammula L. var. flammula
- Greater Dodder - Cuscuta Europaea L.
- Greater Florida Spurge - Euphorbia Floridana Chapm.
- Greater Fringed Gentian - Gentianopsis Crinita (Froel.) Ma
- Greater Galangal - Alpinia Galanga (L.) Sw.
- Greater Herb Robert - Geranium Yeoi Aedo & Muñoz Garm.
- Greater Knapweed - Centaurea Scabiosa L.
- Greater Marsh St. Johnswort - Triadenum Walteri (J.G. Gmel.) Gleason
- Greater Masterwort - Astrantia Major L.
- Greater Poverty Rush - Juncus Anthelatus (Wiegand) R.E. Brooks
- Greater Purple Fringed Orchid - Platanthera Grandiflora (Bigelow) Lindl.
- Greater Rockjasmine - Androsace Maxima L.
- Greater Roundleaved Orchid - Platanthera Macrophylla (Goldie) P.M. Brown
- Greater Showy Stickseed - Hackelia Bella (J.F. Macbr.) I.M. Johnst.
- Greater Straw Sedge - Carex Normalis Mack.
- Greater Swinecress - Coronopus Squamatus (Forssk.) Asch.
- Greater Tickseed - Coreopsis Major Walter
- Greater Water Dock - Rumex Orbiculatus A. Gray
- Greater Water Dock - Rumex Orbiculatus A. Gray var. borealis Rech. f.
- Greater Water Dock - Rumex Orbiculatus A. Gray var. orbiculatus
- Greater Yellow Lady's Slipper - Cypripedium Parviflorum Salisb. var. makasin (Farw.) Sheviak
- Greater Yellow Lady's Slipper - Cypripedium Parviflorum Salisb. var. pubescens (Willd.) Knight
- Greater Yellowspike Orchid - Polystachya Concreta (Jacq.) Garay & H.R. Sweet
- Greater Yellowthroat Gilia - Gilia Tenuiflora Benth.
- Greater Yellowthroat Gilia - Gilia Tenuiflora Benth. ssp. amplifaucalis A.D. Grant & V.E. Grant
- Greater Yellowthroat Gilia - Gilia Tenuiflora Benth. ssp. arenaria (Benth.) A.D. Grant & V.E. Grant
- Greater Yellowthroat Gilia - Gilia Tenuiflora Benth. ssp. tenuiflora
- Grecian Foxglove - Digitalis Lanata Ehrh.
- Grecian Juniper - Juniperus Excelsa M. Bieb.
- Gredin's Whitlowgrass - Draba Gredinii Ekm.
- Greek Dock - Rumex Cristatus DC.
- Greek Oregano - Salvia Fruticosa Mill.
- Greek Thimbleweed - Anemone Blanda Schott & Kotschy
- Greek Valerian - Polemonium Reptans L.
- Greek Valerian - Polemonium Reptans L. var. reptans
- Greek Valerian - Polemonium Reptans L. var. villosum E.L. Braun
- Greeley Springparsley - Cymopterus Acaulis (Pursh) Raf. var. greeleyorum J. Grimes & Packard
- Green Adder's-mouth Orchid - Malaxis Unifolia Michx.
- Green Alder - Alnus Viridis (Chaix) DC.
- Green And Gold - Chrysogonum Virginianum L.
- Green And Gold - Chrysogonum Virginianum L. var. australe (Alexander ex Small) H.E. Ahles
- Green And Gold - Chrysogonum Virginianum L. var. brevistolon G.L. Nesom
- Green And Gold - Chrysogonum Virginianum L. var. virginianum
- Green Antelopehorn - Asclepias Viridis Walter
- Green Arrow Arum - Peltandra Virginica (L.) Schott
- Green Ash - Fraxinus Pennsylvanica Marshall
- Green Beebalm - Monarda Viridissima Correll
- Green Bonnet Orchid - Pleurothallis Ruscifolia (Jacq.) R. Br.
- Green Bristlegrass - Setaria Viridis (L.) P. Beauv.
- Green Bristlegrass - Setaria Viridis (L.) P. Beauv. var. major (Gaudin) Pospichal
- Green Bristlegrass - Setaria Viridis (L.) P. Beauv. var. viridis
- Green Buckwheat - Eriogonum Umbellatum Torr. var. glaberrimum (Gandog.) Reveal
- Green Bulrush - Scirpus Atrovirens Willd.
- Green Carpetweed - Mollugo Verticillata L.
- Green Caskfruit - Doliocarpus Olivaceus Sprague & R.O. Williams ex Standl.
- Green Chireta - Andrographis Paniculata (Burm. f.) Wall. ex Nees
- Green Cliffbrake - Cheilanthes Viridis (Forssk.) Sw.
- Green Cockscomb - Sedum Praealtum DC.
- Green Comet Milkweed - Asclepias Viridiflora Raf.
- Green Deathcamas - Zigadenus Virescens (Kunth) J.F. Macbr.
- Green Dragon - Arisaema Dracontium (L.) Schott
- Green False Foxglove - Agalinis Viridis (Small) Pennell
- Green False Hellebore - Veratrum Viride Aiton
- Green Feathershank - Schoenocaulon Drummondii A. Gray
- Green Fiddleneck - Amsinckia Vernicosa Hook. & Arn.
- Green Fiddleneck - Amsinckia Vernicosa Hook. & Arn. var. vernicosa
- Green Field Speedwell - Veronica Agrestis L.
- Green Flatsedge - Cyperus Virens Michx.
- Green Fly Orchid - Epidendrum Magnoliae Muhl.
- Green Fly Orchid - Epidendrum Magnoliae Muhl. var. magnoliae
- Green Fly Orchid - Epidendrum Magnoliae Muhl. var. mexicanum (L.O. Williams) P.M. Brown
- Green Fringed Orchid - Platanthera Lacera (Michx.) G. Don
- Green Gentian - Frasera Walter
- Green Hawthorn - Crataegus Viridis L.
- Green Hawthorn - Crataegus Viridis L. var. viridis
- Green Hellebore - Helleborus Viridis L.
- Green Indian Paintbrush - Castilleja Chrymactis Pennell
- Green Medusa Orchid - Microthelys Garay
- Green Medusa Orchid - Microthelys Rubrocallosa (B.L. Rob. & Greenm.) Garay
- Green Milkweed - Asclepias Hirtella (Pennell) Woodson
- Green Molly - Bassia Americana (S. Watson) A.J. Scott
- Green Monardella - Monardella Viridis Jeps.
- Green Monardella - Monardella Viridis Jeps. ssp. viridis
- Green Mountain Maidenhair - Adiantum Viridimontanum Paris
- Green Muhly - Muhlenbergia Ramulosa (Kunth) Swallen
- Green Needlegrass - Nassella Viridula (Trin.) Barkworth
- Green Nightshade - Solanum Viride G. Forst. ex Spreng.
- Green Orchid - Platanthera ×correllii Schrenk
- Green Orchid - Platanthera ×estesii Schrenk
- Green Orchid - Platanthera ×lassenii Schrenk
- Green Orchid - Platanthera ×media (Rydb.) Luer (pro sp.)
- Green Phlox - Phlox Viridis E.E. Nelson
- Green Phlox - Phlox Viridis E.E. Nelson ssp. compacta (Brand) Wherry
- Green Phlox - Phlox Viridis E.E. Nelson ssp. longipes (M.E. Jones) Wherry
- Green Phlox - Phlox Viridis E.E. Nelson ssp. viridis
- Green Pitcherplant - Sarracenia Oreophila (Kearney) Wherry
- Green Prairie Coneflower - Ratibida Tagetes (James) Barnhart
- Green Princesplume - Stanleya Viridiflora Nutt.
- Green Rabbitbrush - Ericameria Teretifolia (Durand & Hilg.) Jeps.
- Green River Milkvetch - Astragalus Pubentissimus Torr. & A. Gray
- Green Rockcress - Arabis Missouriensis Greene
- Green Silkyscale - Anthaenantia Villosa (Michx.) P. Beauv.
- Green Slender Lupine - Lupinus Gracilentus Greene
- Green Snakewood - Condalia Viridis I.M. Johnst.
- Green Sotol - Dasylirion Leiophyllum Engelm. ex Trel.
- Green Spikemoss - Selaginella Viridissima Weath.
- Green Sprangletop - Leptochloa Dubia (Kunth) Nees
- Green Stoneseed - Lithospermum Viride Greene
- Green Teatree - Leptospermum Coriaceum (F. Muell. ex Miq.) Cheel
- Green Wattle - Acacia Decurrens (Wendl. f.) Willd.
- Green Wattle - Acacia Irrorata Sieber ex Spreng.
- Green Withe - Vanilla Claviculata (W. Wright) Sw.
- Green's Pohlia Moss - Pohlia Elongata Hedw. var. greenii (Brid.) Shaw
- Green-flower Clermontia - Clermontia Peleana Rock ssp. singuliflora (Rock) Lammers
- Green-leaf Willow - Salix ×rubra Huds.
- Green-tinge Spiderlily - Hymenocallis Speciosa (L. f.) Salisb.
- Green-winged Orchid - Orchis Morio L.
- Greenbrier - Smilax L.
- Greenbright - Gambelia Nutt.
- Greene Brickellbush - Brickellia Greenei A. Gray
- Greene's Bird's-foot Trefoil - Lotus Greenei Ottley ex Kearney & Peebles
- Greene's Blue Eyed Mary - Collinsia Greenei A. Gray
- Greene's Catchfly - Silene Campanulata S. Watson ssp. greenei (S. Watson) C.L. Hitchc. & Maguire
- Greene's Four O'clock - Mirabilis Greenei S. Watson
- Greene's Goldenbush - Ericameria Greenei (A. Gray) G.L. Nesom
- Greene's Goldfields - Lasthenia Debilis (Greene ex A. Gray) Ornduff
- Greene's Hawkweed - Hieracium Greenei A. Gray
- Greene's Liveforever - Dudleya Greenei Rose
- Greene's Maple - Acer Glabrum Torr. var. greenei Keller
- Greene's Mariposa Lily - Calochortus Greenei S. Watson
- Greene's Milkvetch - Astragalus Flexuosus Douglas ex G. Don var. greenei (A. Gray) Barneby
- Greene's Milkweed - Asclepias Californica Greene ssp. greenei Woodson
- Greene's Mountain Ash - Sorbus Scopulina Greene
- Greene's Mountain Ash - Sorbus Scopulina Greene var. scopulina
- Greene's Popcornflower - Plagiobothrys Greenei (A. Gray) I.M. Johnst.
- Greene's Rabbitbrush - Chrysothamnus Greenei (A. Gray) Greene
- Greene's Rockcress - Arabis Repanda S. Watson var. greenei Jeps.
- Greene's Rush - Juncus Greenei Oakes & Tuck.
- Greene's Starviolet - Hedyotis Greenei (A. Gray) W.H. Lewis
- Greenella Arizonica A. Gray
- Greenella Discoidea A. Gray
- Greeneocharis Circumscissa (Hook. & Arn.) Rydb.
- Greeneocharis Circumscissa (Hook. & Arn.) Rydb. var. hispida J.F. Macbr.
- Greeneye Heliotrope - Heliotropium Glabriusculum (Torr.) A. Gray
- Greeneyes - Berlandiera Dc.
- Greeneyes - Berlandiera ×humilis Small (pro sp.)
- Greenflower Indian Mallow - Abutilon Sandwicense (O. Deg.) Christoph.
- Greenflower Nipple Cactus - Mammillaria Barbata Engelm.
- Greenflowered Wintergreen - Pyrola Chlorantha Sw.
- Greenfruit Sedge - Carex Interrupta Boeckeler
- Greenhead Rush - Juncus Chlorocephalus Engelm.
- Greenheart - Colubrina Arborescens (Mill.) Sarg.
- Greenheart Ebony - Rochefortia Acanthophora (DC.) Griseb.
- Greenhorn Fritillary - Fritillaria Brandegeei Eastw.
- Greenland Alkaligrass - Puccinellia Groenlandica T.J. Sørensen
- Greenland Blueeyed Grass - Sisyrinchium Groenlandicum Böcher
- Greenland Brachythecium Moss - Brachythecium Groenlandicum (C.E.O. Jensen) Schljak.
- Greenland Buttercup - Ranunculus Auricomus L.
- Greenland Cinquefoil - Potentilla Stipularis L. var. groenlandica T.J. Sørensen
- Greenland Crabseye Lichen - Ochrolechia Groenlandica Verseghy
- Greenland Cup Lichen - Cladonia Cornuta (L.) Hoffm. ssp. groenlandica (E. Dahl) Ahti
- Greenland Dicranum Moss - Dicranum Groenlandicum Brid.
- Greenland Fescue - Festuca Groenlandica (Schol.) Fred.
- Greenland Lecania Lichen - Lecania Groenlandica (Lynge) ?, ined.?
- Greenland Mountain Ash - Sorbus Groenlandica (C.K. Schneid.) Á. Löve & D. Löve
- Greenland Northern Rockcress - Braya Thorild-wulffii Ostenf.
- Greenland Northern Rockcress - Braya Thorild-wulffii Ostenf. ssp. glabrata J.G. Harris
- Greenland Northern Rockcress - Braya Thorild-wulffii Ostenf. ssp. thorild-wulffii
- Greenland Orange Lichen - Caloplaca Groenlandica Lynge
- Greenland Pondweed - Potamogeton Groenlandicus Hagstr.
- Greenland Primrose - Primula Egaliksensis Wormsk. ex Hornem.
- Greenland Rim Lichen - Lecanora Groenlandica Lynge
- Greenland Sedge - Carex ×groenlandica Lange (pro sp.)
- Greenland Snow Lichen - Stereocaulon Groenlandicum (E. Dahl) Lamb
- Greenland Stitchwort - Minuartia Groenlandica (Retz.) Ostenf.
- Greenland Woodrush - Luzula Groenlandica Böcher
- Greenland Woodrush - Luzula Groenlandica Böcher var. groenlandica
- Greenleaf Cyrtandra - Cyrtandra Viridiflora H. St. John & Storey
- Greenleaf Fescue - Festuca Viridula Vasey
- Greenleaf Five Eyes - Chamaesaracha Coronopus (Dunal) A. Gray
- Greenleaf Manzanita - Arctostaphylos Patula Greene
- Greenleaf Ticktrefoil - Desmodium Intortum (Mill.) Urb.
- Greenleaf Tuckermannopsis Lichen - Tuckermannopsis Chlorophylla (Willd.) Hale
- Greenleaf Willow - Salix Lucida Muhl. ssp. caudata (Nutt.) A.E. Murray
- Greenman's Biscuitroot - Lomatium Greenmanii Mathias
- Greenman's Bluet - Houstonia Parviflora Holz. ex Greenm.
- Greenscale Willow - Salix Chlorolepis Fernald
- Greensheath Sedge - Carex Feta L.H. Bailey
- Greenspot Nightshade - Solanum Douglasii Dunal
- Greenstar Sedge - Carex Viridistellata Derieg, Reznicek, & Bruederle
- Greenstem Forsythia - Forsythia Viridissima Lindl.
- Greenstem Paperflower - Psilostrophe Sparsiflora (A. Gray) A. Nelson
- Greenstipule Lupine - Lupinus Fulcratus Greene
- Greenstripe - Amaranthus Acanthochiton Sauer
- Greensword - Argyroxiphium Virescens Hillebr.
- Greenthread - Thelesperma Less.
- Greentinge Indian Paintbrush - Castilleja Chlorotica Piper
- Greentwig - Brongniartia Kunth
- Greenvein Lady's Tresses - Spiranthes Praecox (Walter) S. Watson
- Greenviolet - Hybanthus Jacq.
- Greenwax Golden Bamboo - Phyllostachys Viridiglaucescens A. Rivière & C. Rivière
- Greenwhite Sedge - Carex Albolutescens Schwein.
- Greenwood's Goldenbush - Ericameria Lignumviridis (S.L. Welsh) G.L. Nesom
- Gregg's Amaranth - Amaranthus Greggii S. Watson
- Gregg's Ash - Fraxinus Greggii A. Gray
- Gregg's Buckwheat - Eriogonum Greggii Torr. & A. Gray
- Gregg's Cloak Fern - Notholaena Greggii (Mett. ex Kuhn) Maxon
- Gregg's Hawthorn - Crataegus Greggiana Eggl.
- Gregg's Keelpod - Synthlipsis Greggii A. Gray
- Gregg's Poreleaf - Porophyllum Greggii A. Gray
- Gregg's Prairie Clover - Dalea Greggii A. Gray
- Gregg's Saddlebush - Mortonia Greggii A. Gray
- Gregg's Sensitive Pea - Chamaecrista Greggii (A. Gray) Pollard ex A. Heller
- Gregg's Tube Tongue - Justicia Pilosella (Nees) Hilsenb.
- Greggia Camporum A. Gray
- Greggia Camporum A. Gray var. linearifolia (S. Watson) M.E. Jones
- Gregoria Montana (A. Gray) House
- Gregorywood - Bucida Buceras L.
- Greville's Dicranella Moss - Dicranella Grevilleana (Brid.) Schimp.
- Grevillea Biternata Meisn.
- Grevillea Crithmifolia R. Br.
- Grevillea - Grevillea R. Br. ex Knight
- Grevillea Hilliana F. Muell.
- Grevillea Leucopteris Meisn.
- Grevillea Paniculata Meisn.
- Grevilleanum Serratum Beck & Emmons
- Grewia Avellana Hiern
- Grewia Crenata (J.R. Forst.) Schinz & Guillaumin
- Grewia Flava DC.
- Grewia Flavescens Juss.
- Grewia - Grewia L.
- Grewia Hexamita Burret
- Grewia Hornbyi Wild
- Grewia Pachycalyx K. Schum.
- Grewia Retinervis Burret
- Grewia Schinzii K. Schum.
- Grewia Similis K. Schum.
- Grewia Stolzii Ulbr.
- Grewia Sulcata Mast.
- Grewia Villosa Willd.
- Grey-birch - Bridelia Insulana Hance
- Greygreen Reindeer Lichen - Cladina Rangiferina (L.) Nyl.
- Gridscale Maiden Fern - Thelypteris Patens (Sw.) Small ex R.P. St. John
- Griffin's Beardtongue - Penstemon Griffinii A. Nelson
- Griffin's Bellflower - Campanula Griffinii Morin
- Griffith's Cliostomum Lichen - Cliostomum Griffithii (Sm.) Coppins
- Griffith's Oedipodium Moss - Oedipodium Griffithianum (Dicks.) Schwägr.
- Griffiths' Saltbush - Atriplex Griffithsii Standl.
- Grimes' Dewberry - Rubus Grimesii L.H. Bailey
- Grimes' Pea - Lathyrus Grimesii Barneby
- Grimmia Affinis Hornsch.
- Grimmia Agassizii (Sull. & Lesq.) A. Jaeger
- Grimmia Alpestris (F. Weber & D. Mohr) Schleich.
- Grimmia Alpestris (F. Weber & D. Mohr) Schleich. var. caespiticia (Brid.) G. Jones
- Grimmia Alpestris (F. Weber & D. Mohr) Schleich. var. holzingeri (Cardot & Thér.)
- Grimmia Alpestris (F. Weber & D. Mohr) Schleich. var. manniae (Müll. Hal.) G. Jone
- Grimmia Alpestris (F. Weber & D. Mohr) Schleich. var. microstoma Bruch & Schimp.
- Grimmia Alpicola Hedw. f. acutifolia Grout
- Grimmia Alpicola Hedw. var. dupretii (Thér.) H.A. Crum
- Grimmia Alpicola Hedw. var. latifolia (J.E. Zetterst.) H. Möller
- Grimmia Alpicola Hedw. var. rivularis (Brid.) Wahlenb.
- Grimmia Alpicola Hedw., nom. utique rej.
- Grimmia Alpicola auct. non Hedw.
- Grimmia Apocarpa Hedw.
- Grimmia Apocarpa Hedw. var. ambigua (Sull.) G. Jones
- Grimmia Apocarpa Hedw. var. atrofusca (Schimp.) Husn.
- Grimmia Apocarpa Hedw. var. brunnescens (Limpr.) Mönk.
- Grimmia Apocarpa Hedw. var. conferta (Funck) Spreng.
- Grimmia Apocarpa Hedw. var. dupretii (Thér.) Sayre
- Grimmia Apocarpa Hedw. var. gracilis Röhl.
- Grimmia Apocarpa Hedw. var. nigrescens Molendo
- Grimmia Apocarpa Hedw. var. obscuroviridis H.A. Crum
- Grimmia Apocarpa Hedw. var. pulvinata (Hedw.) G. Jones
- Grimmia Apocarpa Hedw. var. stricta (Turner) Hook. & Taylor
- Grimmia Apocarpa Hedw. var. tenerrima Nees & Hornsch.
- Grimmia Atricha Müll. Hal. & Kindb.
- Grimmia Calyptrata Hook.
- Grimmia Cinclidodontea Müll. Hal.
- Grimmia Coloradensis Austin
- Grimmia Commutata Hüb.
- Grimmia Crabseye Lichen - Ochrolechia Grimmiae Lynge
- Grimmia Cribrosa Hedw.
- Grimmia Curvata (Brid.) De Sloover
- Grimmia Decipiens Renauld & Cardot var. hendersonii (Renauld & Cardot) Sayre
- Grimmia Decipiens auct. non Renauld & Cardot
- Grimmia Densa Kindb.
- Grimmia Donniana Sm. var. holzingeri (Cardot & Thér.) Wijk & Margad.
- Grimmia Donniana Sm. var. manniae (Müll. Hal.) Wijk & Margad.
- Grimmia Donniana Sm. var. triformis (Carest. & De Not.) Loeske
- Grimmia Dry Rock Moss - Grimmia Anodon Bruch & Schimp.
- Grimmia Dry Rock Moss - Grimmia Anomala Hampe ex Schimp.
- Grimmia Dry Rock Moss - Grimmia Atrata Miel. ex Hornsch.
- Grimmia Dry Rock Moss - Grimmia Brevirostris R.S. Williams
- Grimmia Dry Rock Moss - Grimmia Elatior Bruch ex Bals. & De Not.
- Grimmia Dry Rock Moss - Grimmia Elongata Kaulf.
- Grimmia Dry Rock Moss - Grimmia Funalis (Schwägr.) Bruch & Schimp.
- Grimmia Dry Rock Moss - Grimmia Hamulosa Lesq.
- Grimmia Dry Rock Moss - Grimmia Hedw.
- Grimmia Dry Rock Moss - Grimmia Incurva Schwägr.
- Grimmia Dry Rock Moss - Grimmia Laevigata (Brid.) Brid.
- Grimmia Dry Rock Moss - Grimmia Longirostris Hook.
- Grimmia Dry Rock Moss - Grimmia Mariniana Sayre
- Grimmia Dry Rock Moss - Grimmia Mollis Bruch & Schimp.
- Grimmia Dry Rock Moss - Grimmia Pilifera P. Beauv.
- Grimmia Dry Rock Moss - Grimmia Plagiopodia Hedw.
- Grimmia Dry Rock Moss - Grimmia Poecilostoma Cardot & Seb.
- Grimmia Dry Rock Moss - Grimmia Tenerrima Renauld & Cardot
- Grimmia Dry Rock Moss - Grimmia Teretinervis Limpr.
- Grimmia Dry Rock Moss - Grimmia Torngakiana Brass. & Hedderson
- Grimmia Dry Rock Moss - Grimmia Torquata Hornsch.
- Grimmia Dry Rock Moss - Grimmia Torquata Hornsch. var. torquata
- Grimmia Dry Rock Moss - Grimmia Trichophylla Grev.
- Grimmia Dupretii Thér.
- Grimmia Flaccida (De Not.) Lindb.
- Grimmia Flettii (Holz.) Cardot
- Grimmia Glauca sensu G. Jones
- Grimmia Gracilis (Hedw.) F. Weber & D. Mohr
- Grimmia Hartmanii Schimp. var. anomala (Hampe ex Schimp.) Mönk.
- Grimmia Hendersonii Renauld & Cardot
- Grimmia Heterophylla Kindb.
- Grimmia Hoffmannii Müll. Hal.
- Grimmia Indianensis (Sayre) H.A. Crum
- Grimmia Leibergii Par.
- Grimmia Maritima Turner
- Grimmia Occidentalis E. Lawton
- Grimmia Olympica E. Britton
- Grimmia Orange Lichen - Caloplaca Grimmiae (Nyl.) H. Olivier
- Grimmia Pacifica E. Lawton
- Grimmia Patens (Hedw.) Bruch & Schimp.
- Grimmia Platyphylla Mitt.
- Grimmia Raui Austin
- Grimmia Rivularis Brid.
- Grimmia Sessitana De Not. var. subsulcata (Limpr.) Breidl.
- Grimmia Sphaerica Schimp.
- Grimmia Stricta Turner
- Grimmia Subanodon Ochyra
- Grimmia Tenera J.E. Zetterst.
- Grimmia Tenuicaulis R.S. Williams
- Grimmia Trichophylla Grev. var. brachycarpa De Not.
- Grimmia Trichophylla Grev. var. indianensis Sayre
- Grimmia Trichophylla Grev. var. meridionalis Müll. Hal.
- Grimmia Wrightii (Sull.) Austin
- Grimy Mousetail - Ivesia Rhypara Ertter & Reveal
- Grimy Mousetail - Ivesia Rhypara Ertter & Reveal var. rhypara
- Grindelia Aphanactis Rydb.
- Grindelia Arenicola Steyerm.
- Grindelia Arizonica A. Gray var. dentata Steyerm.
- Grindelia Arizonica A. Gray var. microphylla Steyerm.
- Grindelia Camporum Greene var. parviflora Steyerm.
- Grindelia Ciliata (Nutt.) Spreng.
- Grindelia Fraxinipratensis Reveal & Beatley, orth. var.
- Grindelia Gymnospermoides (A. Gray) Ruffin
- Grindelia Hallii Steyerm. ex Rothr.
- Grindelia Hirsutula Hook. & Arn. ssp. rubricaulis (DC.) D.D. Keck
- Grindelia Humilis Hook. & Arn.
- Grindelia Integrifolia DC. var. macrophylla (Greene) Cronquist
- Grindelia Latifolia Kellogg p.p.
- Grindelia Latifolia Kellogg ssp. platyphylla (Greene) D.D. Keck
- Grindelia Latifolia Kellogg var. platyphylla Greene
- Grindelia Littoralis Steyerm.
- Grindelia Maritima (Greene) Steyerm.
- Grindelia Microcephala DC. var. adenodonta Steyerm.
- Grindelia Microcephala DC. var. pusilla Steyerm.
- Grindelia Nana Nutt. ssp. columbiana Piper
- Grindelia Nana Nutt. var. discoidea (Nutt.) A. Gray
- Grindelia Nana Nutt. var. integrifolia Nutt.
- Grindelia Neomexicana Wooton & Standl.
- Grindelia Paludosa Greene
- Grindelia Perennis A. Nelson
- Grindelia Procera Greene
- Grindelia Robusta Nutt. p.p.
- Grindelia Robusta Nutt. var. angustifolia A. Gray
- Grindelia Robusta Nutt. var. bracteosa (J.T. Howell) D.D. Keck
- Grindelia Scabra Greene var. neomexicana (Wooton & Standl.) Steyerm.
- Grindelia Serrulata Rydb.
- Grindelia Squarrosa (Pursh) Dunal var. integrifolia (Nutt.) B. Boivin
- Grindelia Squarrosa (Pursh) Dunal var. nuda (Alph. Wood) A. Gray
- Grindelia Stricta DC. ssp. blakei (Steyerm.) D.D. Keck
- Grindelia Stricta DC. ssp. venulosa (Jeps.) D.D. Keck
- Grindelia Stylosa Eastw.
- Grindelia Texana Scheele
- Grindelia Texana Scheele var. lanceolata (Nutt.) Shinners
- Grinnell's Beardtongue - Penstemon Grinnellii Eastw.
- Grinnell's Beardtongue - Penstemon Grinnellii Eastw. ssp. grinnellii
- Grinnell's Beardtongue - Penstemon Grinnellii Eastw. ssp. scrophularioides (M.E. Jones) Munz
- Grisebach's Bristlegrass - Setaria Grisebachii Fourn.
- Grisebach's Dwarf Morning-glory - Evolvulus Grisebachii Peter
- Grisebach's Swallow-wort - Cynanchum Grisebachianum (Schltr.) Alain
- Grisebach's Tribisee - Lasiacis Grisebachii (Nash) Hitchc.
- Grizzleybear Pricklypear - Opuntia ×columbiana Griffiths (pro sp.)
- Grizzlybear Pricklypear - Opuntia Polyacantha Haw. var. erinacea (Engelm. & J.M. Bigelow ex Engelm.) Parfitt
- Grizzlybear Pricklypear - Opuntia Polyacantha Haw. var. hystricina (Engelm. & J.M. Bigelow) Parfitt
- Grooved Flax - Linum Sulcatum Riddell
- Grooved Flax - Linum Sulcatum Riddell var. sulcatum
- Groovenut Flatsedge - Cyperus Sulcinux C.B. Clarke
- Groovestem Bouchea - Bouchea Linifolia A. Gray
- Groovestem Indian Plantain - Arnoglossum Plantagineum Raf.
- Grossularia Amara (McClatchie) Coville & Britton
- Grossularia Binominata (A. Heller) Coville & Britton
- Grossularia Californica (Hook. & Arn.) Coville & Britton
- Grossularia Campestris Small
- Grossularia Cognata (Greene) Coville & Britton
- Grossularia Cruenta (Greene) Coville & Britton
- Grossularia Curvata (Small) Coville & Britton
- Grossularia Cynosbati (L.) Mill.
- Grossularia Divaricata (Douglas) Coville & Britton
- Grossularia Echinella Coville
- Grossularia Greeneana (A. Heller) Coville & Britton
- Grossularia Hesperia (McClatchie) Coville & Britton
- Grossularia Hirtella (Michx.) Spach
- Grossularia Hystrix (Eastw.) Coville & Britton
- Grossularia Inermis (Rydb.) Coville & Britton
- Grossularia Inermis (Rydb.) Coville & Britton var. pubescens A. Berger
- Grossularia Irrigua (Douglas) Coville & Britton
- Grossularia Klamathensis Coville
- Grossularia Lasiantha (Greene) Coville & Britton
- Grossularia Leptosma Coville
- Grossularia Lobbii (A. Gray) Coville & Britton
- Grossularia Marshallii (Greene) Coville & Britton
- Grossularia Menziesii (Pursh) Coville & Britton
- Grossularia Missouriensis (Nutt.) Coville & Britton
- Grossularia Neglecta A. Berger
- Grossularia Nonscripta A. Berger
- Grossularia Oxyacanthoides (L.) Mill.
- Grossularia Parishii (A. Heller) Coville & Britton
- Grossularia Quercetora (Greene) Coville & Britton
- Grossularia Reclinata (L.) Mill.
- Grossularia Roezlii (Regel) Coville & Britton
- Grossularia Rotundifolia (Michx.) Coville & Britton
- Grossularia Senilis Coville
- Grossularia Sericea (Eastw.) Coville & Britton
- Grossularia Setosa (Lindl.) Coville & Britton
- Grossularia Speciosa (Pursh) Coville & Britton
- Grossularia Texensis Coville & A. Berger
- Grossularia Tularensis Coville
- Grossularia Utilis (Jancz.) A. Berger
- Grossularia Velutina (Greene) Coville & Britton
- Grossularia Victoris (Greene) Coville & Britton
- Grossularia Watsoniana (Koehne) Coville & Britton
- Ground Gooseberry - Ribes Binominatum A. Heller
- Ground Ivy - Glechoma Hederacea L.
- Ground Nama - Nama Aretioides (Hook. & Arn.) Brand
- Ground Nama - Nama Aretioides (Hook. & Arn.) Brand var. aretioides
- Ground Nama - Nama Aretioides (Hook. & Arn.) Brand var. californicum (Brand) Jeps.
- Ground Nama - Nama Aretioides (Hook. & Arn.) Brand var. multiflorum (A. Heller) Jeps.
- Ground Orchid - Spathoglottis Blume
- Ground Rose - Rosa Spithamea S. Watson
- Ground Rose - Rosa Spithamea S. Watson var. spithamea
- Ground Virginsbower - Clematis Recta L.
- Ground-crescent Milkvetch - Astragalus Chamaemeniscus Barneby
- Groundberry - Rubus Provincialis L.H. Bailey
- Groundcedar - Lycopodium Complanatum L.
- Groundcherry - Physalis L.
- Groundcone - Boschniakia C.a. Mey. ex Bong.
- Groundcover Milkvetch - Astragalus Humistratus A. Gray
- Groundcover Milkvetch - Astragalus Humistratus A. Gray var. crispulus Barneby
- Groundcover Milkvetch - Astragalus Humistratus A. Gray var. hosackiae (Greene) M.E. Jones
- Groundcover Milkvetch - Astragalus Humistratus A. Gray var. humistratus
- Groundcover Milkvetch - Astragalus Humistratus A. Gray var. humivagans (Rydb.) Barneby
- Groundcover Milkvetch - Astragalus Humistratus A. Gray var. sonorae (A. Gray) M.E. Jones
- Groundcover Milkvetch - Astragalus Humistratus A. Gray var. tenerrimus M.E. Jones
- Groundnut - Apios Americana Medik.
- Groundnut - Apios Fabr.
- Groundnut - Arachis Villosulicarpa Hoehne
- Groundplum Milkvetch - Astragalus Crassicarpus Nutt.
- Groundplum Milkvetch - Astragalus Crassicarpus Nutt. var. berlandieri Barneby
- Groundplum Milkvetch - Astragalus Crassicarpus Nutt. var. cavus Barneby
- Groundplum Milkvetch - Astragalus Crassicarpus Nutt. var. crassicarpus
- Groundplum Milkvetch - Astragalus Crassicarpus Nutt. var. paysonii (E.H. Kelso) Barneby
- Groundplum Milkvetch - Astragalus Crassicarpus Nutt. var. trichocalyx (Nutt.) Barneby
- Groundsel - Roldana Llave ex Lex.
- Groundsel - Tephroseris (rchb.) Rchb.
- Groundsmoke - Gayophytum A. Juss.
- Grouse Creek Rockcress - Arabis Falcatoria Rollins
- Grouse Whortleberry - Vaccinium Scoparium Leiberg ex Coville
- Groutiella Moss - Groutiella Steere
- Groutiella Moss - Groutiella Tumidula (Mitt.) Vitt
- Groutiella Mucronifolia sensu H.A. Crum & Steere
- Grove Bluegrass - Poa Alsodes A. Gray
- Grove Hawthorn - Crataegus Lucorum Sarg.
- Grugru Palm - Acrocomia Media O.F. Cook
- Grugru Palm - Acrocomia Totai Mart.
- Grumichama - Eugenia Brasiliensis Lam.
- Grundlach's Attorney - Clusia Gundlachii Stahl
- Guaco - Mikania Congesta DC.
- Guadalupe Beardtongue - Penstemon Guadalupensis A. Heller
- Guadalupe Cryptantha - Cryptantha Maritima (Greene) Greene
- Guadalupe Cryptantha - Cryptantha Maritima (Greene) Greene var. maritima
- Guadalupe Cryptantha - Cryptantha Maritima (Greene) Greene var. pilosa I.M. Johnst.
- Guadalupe Cypress - Hesperocyparis Guadalupensis (S. Watson) Bartel
- Guadalupe Fescue - Festuca Ligulata Swallen
- Guadalupe Island Lupine - Lupinus Guadalupensis Greene
- Guadalupe Leastdaisy - Chaetopappa Hersheyi S.F. Blake
- Guadalupe Milkvetch - Astragalus Pictiformis Barneby
- Guadalupe Mountain Foxtail Cactus - Escobaria Guadalupensis Brack & K.D. Heil
- Guadalupe Mountain Necklacepod - Sophora Gypsophila B.L. Turner & A. Powell
- Guadalupe Mountain Necklacepod - Sophora Gypsophila B.L. Turner & A. Powell var. guadalupensis B.L. Turner & A. Powe
- Guadalupe Mountain Sedge - Carex Mckittrickensis P.W. Ball
- Guadalupe Oak - Quercus ×guadalupensis Sarg.
- Guadalupe Rabbitbrush - Chrysothamnus Spathulatus L.C. Anderson
- Guadalupe Ricegrass - Achnatherum Curvifolium (Swallen) Barkworth
- Guadalupe Suncup - Camissonia Guadalupensis (S. Watson) P.H. Raven
- Guadalupe Valerian - Valeriana Texana Steyerm.
- Guadalupe Violet - Viola Guadalupensis A. Powell & B. Wauer
- Guadalupe Waternymph - Najas Guadalupensis (Spreng.) Magnus ssp. olivacea (Rosend. & Butters) Haynes & C.B.
- Guadalupe Wild Coffee - Psychotria Guadalupensis (DC.) Howard
- Guadalupe Wild Coffee - Psychotria Guadalupensis (DC.) Howard ssp. grosourdyana (Baill.) Steyerm.
- Guadalupe Wild Coffee - Psychotria Guadalupensis (DC.) Howard ssp. guadalupensis
- Guadeloupe Blackbead - Cojoba Graciliflora (S.F. Blake) Britton & Rose
- Guadeloupe Bog Orchid - Habenaria Amalfitana Lehm. & Kränzlin
- Guadeloupe Bonnet Orchid - Pleurothallis Domingensis Cogn.
- Guadeloupe Cucumber - Melothria Pendula L.
- Guadeloupe Cucumber - Melothria Pendula L. var. aspera Cogn.
- Guadeloupe Cucumber - Melothria Pendula L. var. crassifolia (Small) Cogn.
- Guadeloupe Cucumber - Melothria Pendula L. var. pendula
- Guadeloupe Maiden Fern - Thelypteris Guadalupensis (Wikstr.) Proctor
- Guadeloupe Marlberry - Ardisia Obovata Desv. ex Ham.
- Guadeloupe Peperomia - Peperomia Emarginella (Sw. ex Wikstr.) C. DC.
- Guadeloupe Tonguefern - Elaphoglossum Erinaceum (Fée) T. Moore
- Guaiacum Unijugum Brandegee [excluded]
- Guajacum L.
- Guaje - Leucaena Esculenta (Sessé & Moc.) Benth.
- Guajillo - Senegalia Berlandieri Britton & Rose
- Guam Coelogyne - Coelogyne Guamensis Ames
- Guama - Reynosia Guama Urb.
- Guama Venezolano - Inga Nobilis Willd.
- Guama Venezolano - Inga Nobilis Willd. ssp. quaternata (Poepp. & Endl.) T.D. Penn.
- Guamia Mariannae (Saff.) Merr.
- Guamia Merr.
- Guanabanilla - Ouratea Striata (v. Tiegh.) Urb.
- Guapa - Dracontium Polyphyllum L.
- Guapilla - Hechtia Glomerata Zucc.
- Guapira Bracei (Britton) Little
- Guapira Floridana (Britton ex Small) Lund
- Guapira - Guapira Aubl.
- Guapira Longifolia (Heimerl) Little
- Guar - Cyamopsis Tetragonoloba (L.) Taubert
- Guara Blanca - Cupania Triquetra A. Rich.
- Guarana - Paullinia Cupana Kunth
- Guard Withe - Cydista Aequinoctialis (L.) Miers
- Guardiola - Guardiola Cerv. ex Humb. & Bonpl.
- Guarea Guara (Jacq.) P. Wilson
- Guarea - Guarea Allam. ex L.
- Guarea Ramiflora Vent.
- Guarea Trichilioides L.
- Guasabara - Eugenia Eggersii Kiaersk.
- Guasimilla - Prockia Crucis P. Br. ex L.
- Guatemalan Avocado - Persea Nubigena L.O. Williams
- Guatemalan Avocado - Persea Nubigena L.O. Williams var. guatemalensis L.O. Williams
- Guatemalan Bird Of Paradise - Heliconia Subulata Ruiz & Pav.
- Guatemalan Fir - Abies Guatemalensis Rehder
- Guatemalan Gamagrass - Tripsacum Fasciculatum Trin. ex Asch.
- Guatemalan Indigo - Indigofera Guatemalensis Moc. & Sessé ex Prain & Backer
- Guatteria - Guatteria Ruiz & Pav.
- Guava - Psidium Guajava L.
- Guava - Psidium L.
- Guavaberry - Myrciaria Berg
- Guavaberry - Myrciaria Floribunda (West ex Willd.) Berg
- Guayabacon - Myrcia Leptoclada DC.
- Guayabilla - Samyda Dodecandra Jacq.
- Guayabota De Fajardo - Eugenia Fajardensis (Krug & Urb.) Urb.
- Guayabota De Sierra - Eugenia Borinquensis Britton
- Guayama Copperleaf - Acalypha Berteriana Müll. Arg.
- Guayanan Waterclover - Marsilea Polycarpa Hook. & Grev.
- Guayanilla - Imperata Contracta (Kunth) Hitchc.
- Guayule - Parthenium Argentatum A. Gray
- Guazuma Guazuma (L.) Cockerell, nom. inval.
- Guazuma - Guazuma Mill.
- Guepin's Desmatodon Moss - Desmatodon Guepinii Bruch & Schimp.
- Guest Tree - Kleinhovia Hospita L.
- Guettarda - Guettarda L.
- Guettarda Laevis Urb.
- Guettarda Parviflora Vahl
- Guettarda Speciosa L.
- Guiana Brosimum - Brosimum Guianense (Aubl.) Huber
- Guiana Fern - Lomagramma Guianensis (Aubl.) Ching
- Guiana Plum - Drypetes Lateriflora (Sw.) Krug & Urb.
- Guiana-chestnut - Pachira Aquatica Aubl.
- Guianese Colicwood - Myrsine Cubana A. DC.
- Guibourtia Benth.
- Guilandina Bonduc L.
- Guilandina Crista auct. non (L.) Small
- Guilandina Divergens (Urb.) Britton
- Guilandina Melanosperma Eggers
- Guilandina Ovalifolia (Urb.) Britton
- Guilandina Portoricensis Britton & P. Wilson
- Guilarte - Epidendrum Vicentinum Lindl.
- Guilielma Gasipaes (Kunth) L.H. Bailey
- Guilielma Speciosa Mart.
- Guilleminea Lanuginosa (Poir.) Hook. f.
- Guilleminea Lanuginosa (Poir.) Hook. f. var. rigidiflora (Hook.) Mears
- Guilleminea Lanuginosa (Poir.) Hook. f. var. sheldonii (Uline & Bray) Mears
- Guilleminea Lanuginosa (Poir.) Hook. f. var. tenuiflora (Hook.) Mears
- Guillenia Lemmonii (Greene) R.E. Buck, nom. inval.
- Guinea Bactris - Aiphanes Minima (Gaertn.) Burret
- Guinea Bactris - Bactris Guineensis (L.) H.E. Moore
- Guinea Guava - Psidium Guineense Sw.
- Guinea Henweed - Petiveria Alliacea L.
- Guinea Yam - Dioscorea Rotundata Poir.
- Guineaflower - Hermbstaedtia Odorata (Burch.) T. Cooke
- Guineagrass - Urochloa Maxima (Jacq.) R. Webster
- Guirado Goldenrod - Solidago Guiradonis A. Gray
- Guizotia - Guizotia Cass.
- Gulch Cyrtandra - Cyrtandra Filipes Hillebr.
- Gulf Blazing Star - Liatris Tenuis Shinners
- Gulf Bluestem - Schizachyrium Maritimum (Chapm.) Nash
- Gulf Coast Bulrush - Isolepis Molesta (M.C. Johnst.) S.G. Sm.
- Gulf Coast Lupine - Lupinus Westianus Small
- Gulf Coast Lupine - Lupinus Westianus Small var. aridorum (McFarlin ex Beckner) Isely
- Gulf Coast Lupine - Lupinus Westianus Small var. westianus
- Gulf Coast Searocket - Cakile Constricta Rodman
- Gulf Coast Spikerush - Eleocharis Cellulosa Torr.
- Gulf Coast Swallow-wort - Cynanchum Angustifolium Pers.
- Gulf Coast Yucca - Yucca Louisianensis Trel.
- Gulf Cockspur Grass - Echinochloa Crus-pavonis (Kunth) Schult.
- Gulf Cockspur Grass - Echinochloa Crus-pavonis (Kunth) Schult. var. crus-pavonis
- Gulf Cockspur Grass - Echinochloa Crus-pavonis (Kunth) Schult. var. macera (Wiegand) Gould
- Gulf Cordgrass - Spartina Spartinae (Trin.) Merr. ex Hitchc.
- Gulf Croton - Croton Punctatus Jacq.
- Gulf Graytwig - Schoepfia Schreberi J.F. Gmel.
- Gulf Hawthorn - Crataegus Resima Beadle
- Gulf Indian Breadroot - Pediomelum Rhombifolium (Torr. & A. Gray) Rydb.
- Gulf Leaf-flower - Phyllanthus Fraternus G.L. Webster
- Gulf Of St. Lawrence Aster - Symphyotrichum Laurentianum (Fernald) G.L. Nesom
- Gulf Pipewort - Eriocaulon Koernickianum van Heurck & Müll. Arg.
- Gulf Pitcherplant - Sarracenia Rubra Walter ssp. gulfensis D.E. Schnell
- Gulf Sandmat - Chamaesyce Thymifolia (L.) Millsp.
- Gulf Searocket - Cakile Geniculata (B.L. Rob.) Millsp.
- Gulf Sebastian-bush - Ditrysinia Fruticosa (W. Bartram) Govaerts & Frodin
- Gulf Skullcap - Scutellaria Cardiophylla Engelm. & A. Gray
- Gulf Spikemoss - Selaginella Ludoviciana A. Braun
- Gulf Swampweed - Hygrophila Lacustris (Schltdl. & Cham.) Nees
- Gulf Vervain - Verbena Xutha Lehm.
- Gulfdune Paspalum - Paspalum Monostachyum Vasey
- Gulfhairawn Muhly - Muhlenbergia Filipes M.A. Curtis
- Gullfeed - Scaevola Plumieri (L.) Vahl
- Gulubia Palauensis (Becc.) H.E. Moore & Fosberg
- Gum Arabic - Senegalia Senegal (L.) Britton
- Gum Bully - Sideroxylon Lanuginosum Michx.
- Gum Bully - Sideroxylon Lanuginosum Michx. ssp. albicans (Sarg.) Kartesz & Gandhi
- Gum Bully - Sideroxylon Lanuginosum Michx. ssp. lanuginosum
- Gum Bully - Sideroxylon Lanuginosum Michx. ssp. oblongifolium (Nutt.) T.D. Penn.
- Gum Bully - Sideroxylon Lanuginosum Michx. ssp. rigidum (A. Gray) T.D. Penn.
- Gum Copal Tree - Daniellia Ogea (Harms) Rolfe ex Holland
- Gum - Eucalyptus L'hér.
- Gum - Eucalyptus ×mortoniana Kinney (pro sp.)
- Gum Ghatti - Anogeissus Latifolia (Roxb. ex DC.) Wall. ex Beddome
- Gum Tragacanth Milkvetch - Astragalus Gummifer Labill.
- Gumbo Limbo - Bursera Simaruba (L.) Sarg.
- Gumbo Milkvetch - Astragalus Ampullarius S. Watson
- Gumhar - Gmelina Arborea Roxb.
- Gumhead - Gymnosperma Glutinosum (Spreng.) Less.
- Gummy Gooseberry - Ribes Lobbii A. Gray
- Gummy Lovegrass - Eragrostis Curtipedicellata Buckley
- Gumtree - Sapium Glandulosum (L.) Morong
- Gumweed - Grindelia Willd.
- Gundelia - Gundelia L.
- Gundlachia - Gundlachia A. Gray
- Gunnera Chilensis Lam.
- Gunnera Eastwoodae H. St. John
- Gunnera - Gunnera L.
- Gunnera Kaalensis (Krajina) H. St. John
- Gunnera Makahaensis H. St. John
- Gunnera Mauiensis (Krajina) H. St. John
- Gunnera Molokaiensis H. St. John
- Gunnison County Rockcress - Arabis Pallidifolia Rollins
- Gunnison Milkvetch - Astragalus Anisus M.E. Jones
- Gunnison's Mariposa Lily - Calochortus Gunnisonii S. Watson
- Gunnison's Mariposa Lily - Calochortus Gunnisonii S. Watson var. gunnisonii
- Gunnison's Mariposa Lily - Calochortus Gunnisonii S. Watson var. perpulcher Cockerell
- Gunnison's Rockcress - Arabis Gunnisoniana Rollins
- Gunsight Clarkia - Clarkia Xantiana A. Gray
- Gunsight Clarkia - Clarkia Xantiana A. Gray ssp. xantiana
- Gurney's Hedgehog Cactus - Echinocereus Coccineus Engelm. var. gurneyi (L.D. Benson) K.D. Heil & Brack
- Gurney's Yucca - Yucca Glauca Nutt. var. gurneyi McKelvey
- Gutierrezia Bracteata Abrams
- Gutierrezia Diversifolia Greene
- Gutierrezia Dracunculoides (DC.) S.F. Blake
- Gutierrezia Eriocarpa A. Gray
- Gutierrezia Glomerella Greene
- Gutierrezia Glutinosa (S. Schauer) Sch. Bip.
- Gutierrezia Gymnospermoides A. Gray
- Gutierrezia Lepidota Greene
- Gutierrezia Linearifolia Lag.
- Gutierrezia Linearis Rydb.
- Gutierrezia Linoides Greene
- Gutierrezia Longipappa S.F. Blake
- Gutierrezia Lucida (Greene) Greene
- Gutierrezia Polyantha A. Nelson
- Gutierrezia Pomariensis (S.L. Welsh) S.L. Welsh
- Gutierrezia Sarothrae (Pursh) Britton & Rusby var. microcephala (DC.) L.D. Benson
- Gutierrezia Sarothrae (Pursh) Britton & Rusby var. pomariensis S.L. Welsh
- Gutierrezia Tenuis Greene
- Gutierrezia Triflora (Rose) M.A. Lane
- Gutta Percha - Palaquium Gutta (Hook. f.) Baill.
- Guyandotte Beauty - Synandra Hispidula (Michx.) Britton
- Guyanese Arrowhead - Sagittaria Guayanensis Kunth
- Guyanese Pepper - Piper Glabrescens (Miq.) C. DC.
- Guyanese Wild Coffee - Casearia Guianensis (Aubl.) Urb.
- Guzmania Berteriana (Schult. & Schult. f.) Mez, orth. var.
- Guzmania Erythrolepis Brongn. ex Planch. [excluded]
- Gyalecta Carneolutea (Turner) H. Olivier
- Gyalectidium Lichen - Gyalectidium Filicinum Müll. Arg.
- Gyalectidium Lichen - Gyalectidium Müll. Arg.
- Gyalectidium Rotuliforme Müll. Arg.
- Gyalectina Carneolutea (Turner) Vezda
- Gyalidea Dodgei Vezda
- Gyalidea Lecideopsis (A. Massal.) Lettau ex Vezda var. eucarpa (Servit) Vezda
- Gyalidea Lecideopsis (A. Massal.) Lettau ex Vezda var. kurdistanica (Steiner) Vezda
- Gyalidea Lichen - Gyalidea Hyalinescens (Nyl.) Vezda
- Gyalidea Lichen - Gyalidea Lecideopsis (A. Massal.) Lettau ex Vezda
- Gyalidea Lichen - Gyalidea Lecideopsis (A. Massal.) Lettau ex Vezda var. convarians (Nyl.) Vezda
- Gyalidea Lichen - Gyalidea Lettau ex Vezda
- Gyalidea Roseola (Arnold) Lettau
- Gyalideopsis Lichen - Gyalideopsis Anastomosnas P. James & Vezda
- Gyalideopsis Lichen - Gyalideopsis Athalloides (Nyl.) Vezda
- Gyalideopsis Lichen - Gyalideopsis Vainioi Kalb & Vezda
- Gyalideopsis Lichen - Gyalideopsis Vezda
- Gyalideopsis Piceicola (Nyl.) Vezda
- Gyalidiopsis Alnicola W. Noble & Vezda
- Gyminda Latifolia (Sw.) Urb. var. glaucifolia Small
- Gymnadenia - Gymnadenia R. Br.
- Gymnadeniopsis Clavellata (Michx.) Rydb.
- Gymnadeniopsis Integra (Nutt.) Rydb.
- Gymnadeniopsis Nivea (Nutt.) Rydb.
- Gymnanthemum Obovatum Gaudich.
- Gymnanthes - Gymnanthes Sw.
- Gymnema - Gymnema R. Br.
- Gymnocarpium Dryopteris (L.) Newman ssp. disjunctum (Rupr.) Sarvela
- Gymnocarpium Dryopteris (L.) Newman var. disjunctum (Rupr.) Ching
- Gymnocarpium Dryopteris (L.) Newman var. pumilum (DC.) B. Boivin
- Gymnocarpium Heterosporum W.H. Wagner, database artifact
- Gymnocolea (dumort.) Dumort.
- Gymnocolea Acutiloba (Schiffn.) Müll. Frib.
- Gymnocolea Borealis (Frisvoll & Moen) R.M. Schust.
- Gymnocolea Fascinifera Potemk.
- Gymnocolea Inflata (Huds.) Dumort.
- Gymnocolea Inflata (Huds.) Dumort. var. heterostipa (Carrington & Spruce) Müll. Fri
- Gymnocolea Inflata (Huds.) Dumort. var. inflata
- Gymnoderma Lichen - Gymnoderma Lineare (A. Evans) Yoshim. & Sharp
- Gymnoderma Lichen - Gymnoderma Nyl.
- Gymnolomia Hispida (A. Gray) B.L. Rob. & Greenm.
- Gymnolomia Hispida (A. Gray) B.L. Rob. & Greenm. var. ciliata B.L. Rob. & Greenm.
- Gymnolomia Longifolia B.L. Rob. & Greenm.
- Gymnomitrion Apiculatum (Schiffn.) Müll. Frib.
- Gymnomitrion Concinnatum (Lightf.) Corda
- Gymnomitrion Corallioides Nees
- Gymnomitrion Corda, nom. cons.
- Gymnomitrion Laceratum (Steph.) Horik.
- Gymnomitrion Mucrophorum R.M. Schust.
- Gymnomitrion Obtusum (Lindb.) Pears.
- Gymnomitrion Pacificum Grolle
- Gymnopogon Floridanus Swallen
- Gymnopteris Hispida (Mett. ex Kuhn) Underw.
- Gymnosiphon Germainii Urb.
- Gymnosiphon Papuanum Becc., orth. var.
- Gymnosperma - Gymnosperma Less.
- Gymnosporia - Gymnosporia (wight & Arn.) Benth. & Hook. f.
- Gymnosteris - Gymnosteris Greene
- Gymnosteris Nudicaulis (Hook. & Arn.) Greene var. pulchella (Greene) Brand
- Gymnostomiella Moss - Gymnostomiella Fleisch.
- Gymnostomum Angustifolium K. Saito
- Gymnostomum Curvirostrum Hedw. ex Brid.
- Gymnostomum Insigne (Dix.) A.J.E. Sm.
- Gymnostomum Latifolium (J.E. Zetterst.) Flow.
- Gymnostomum Moss - Gymnostomum Aeruginosum Sm.
- Gymnostomum Moss - Gymnostomum Nees & Hornsch.
- Gymnostomum Recurvirostre Hedw.
- Gymnostomum Recurvirostre Hedw. var. commutatum (Mitt.) Grout
- Gymnostomum Recurvirostre Hedw. var. latifolium J.E. Zetterst.
- Gymnostomum Recurvirostre Hedw. var. scabrum (Lindb.) Grout
- Gymnostomum Tenue Hedw.
- Gymnostyles Nasturtiifolia auct. non Juss.
- Gynandropsis Gynandra (L.) Briq.
- Gynochthodes Blume
- Gynotroches Axillaris Blume
- Gynotroches Blume
- Gynura - Gynura Cass.
- Gyp Dropseed - Sporobolus Nealleyi Vasey
- Gypsophila Elegans M. Bieb. var. elegans
- Gypsophila Pacifica Kom.
- Gypsophila Paniculata L. var. paniculata
- Gypsophila Perfoliata L. var. latifolia Maxim. [excluded]
- Gypsophila Porrigens (L.) Boiss.
- Gypsophila Repens L. var. rosea hort.
- Gypsophila Stevenii Fisch. ex Schrank [excluded]
- Gypsoplaca Lichen - Gypsoplaca Timdal
- Gypsum Blazingstar - Mentzelia Humilis (A. Gray) J. Darl.
- Gypsum Blazingstar - Mentzelia Humilis (A. Gray) J. Darl. var. guadalupensis Spellenb.
- Gypsum Blazingstar - Mentzelia Humilis (A. Gray) J. Darl. var. humilis
- Gypsum Centaury - Centaurium Maryannum B.L. Turner
- Gypsum Grama - Bouteloua Breviseta Vasey
- Gypsum Milkvetch - Astragalus Gypsodes Barneby
- Gypsum Moonpod - Selinocarpus Maloneanus B.L. Turner
- Gypsum Phacelia - Phacelia Integrifolia Torr.
- Gypsum Phacelia - Phacelia Integrifolia Torr. var. integrifolia
- Gypsum Ringstem - Anulocaulis Leiosolenus (Torr.) Standl. var. gypsogenus (Waterf.) Spellenb. & Wootten
- Gypsum Springbeauty - Claytonia Gypsophiloides Fisch. & C.A. Mey.
- Gypsum Tansyaster - Machaeranthera Gypsophila B.L. Turner
- Gypsum Threeawn - Aristida Gypsophila Beetle
- Gypsum-lovingtownsend Daisy - Townsendia Gypsophila T.K. Lowrey & P.J. Knight
- Gypsyflower - Cynoglossum Officinale L.
- Gypsywort - Lycopus Europaeus L.
- Gyrophora Angulata (Tuck.) Herre
- Gyrophora Anthracina (Wulfen) Körb.
- Gyrophora Arctica Ach.
- Gyrophora Cylindrica (L.) Ach.
- Gyrophora Decussata (Vill.) Zahlbr.
- Gyrophora Deusta (L.) Ach.
- Gyrophora Dillenii (Tuck.) Müll. Arg.
- Gyrophora Erosa (G. Weber) Ach.
- Gyrophora Hyperborea Ach.
- Gyrophora Muehlenbergii Ach.
- Gyrophora Phaea (Tuck.) Nyl.
- Gyrophora Polyphylla (L.) Fink
- Gyrophora Polyrrhiza (L.) Körb.
- Gyrophora Vellea (L.) Ach.
- Gyrostomum Lichen - Gyrostomum Fr.
- Gyrostomum Lichen - Gyrostomum Scyphuliferum (Ach.) Nyl.
- Gyrotheca Tinctoria (J.F. Gmel.) Salisb., orth. var.
- Gyrotheca Tinctorium (J.F. Gmel.) Salisb.
- Gyrothyra M. Howe
- Gyrothyra Underwoodiana M. Howe
- Gyroweisia Moss - Gyroweisia Schimp.
- Gyroweisia Moss - Gyroweisia Tenuis (Hedw.) Schimp.
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