Complete list of species
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| scientific name | common name(s) | image gallery |
| Giliastrum ludens | Rio Grande Gilia | |
| Giliastrum rigidulum | Bluebowls Blue Gilia | |
| Gillenia stipulata | American Ipecac | |
| Gillenia trifoliata | Bowman's Root Indian Physic | |
| Gilmania luteola | Golden Carpet Goldencarpet | |
| Githopsis diffusa | San Gabriel Bluecup Southern Bluecup Southern Blue Cup | |
| Githopsis diffusa ssp. candida | San Gabriel Bluecup | |
| Githopsis diffusa ssp. diffusa | San Gabriel Bluecup Southern Bluecup Southern Blue Cup | |
| Githopsis diffusa ssp. filicaulis | San Gabriel Bluecup Mission Canyon Bluecup | |
| Githopsis diffusa ssp. robusta | San Gabriel Bluecup | |
| Githopsis pulchella | Sierra Bluecup | |
| Githopsis pulchella ssp. campestris | Sierra Bluecup Largeflower Bluecup | |
| Githopsis pulchella ssp. pulchella | Sierra Bluecup | |
| Githopsis pulchella ssp. serpentinicola | Sierra Bluecup Serpentine Bluecup | |
| Githopsis pulchella var. glabra | Sierra Bluecup | |
| Githopsis pulchella var. pulchella | Sierra Bluecup | |
| Githopsis specularioides | Common Bluecup Common Blue-cup Venus' Looking Glass | |
| Githopsis tenella | Tubeflower Bluecup Tube-flower Bluecup Tube Flower Bluecup Delicate Bluecup | |
| Glandularia bipinnatifida | Prairie Verbena Purple Prairie Verbena Dakota Vervain Dakota Mock Vervain Moradilla Alfombrilla | |
| Glandularia bipinnatifida var. bipinnatifida | Prairie Verbena Purple Prairie Verbena Dakota Mock Vervain Dakota Vervain | |
| Glandularia bipinnatifida var. ciliata | Davis Mountains Mock Vervain Dakota Mock Vervain Wright's Verbena | |
| Glandularia canadensis | Rose Vervain Sweet William Rose Mock Vervain | |
| Glandularia chiricahensis | Chiricahua Mountain Mock Vervain Chiricahua Mock Vervain | |
| Glandularia delticola | Moradia | |
| Glandularia gooddingii | Southwestern Mock Vervain Pink Verbena Southwestern Vervain Goodding's Verbena Mojave Verbena | |
| Glandularia maritima | Beach Verbena Coastal Mock Vervain Coastal Vervain | |
| Glandularia polyantha | Rio Grande Mock Vervain | |
| Glandularia pumila | Dwarf Vervain Low Verbena Pink Mock Vervain Pink Verbena Wild Vervain | |
| Glandularia quandrangulata | Beaked Mock Vervain Pale Mock Vervain Chihuahuan Mock Vervain | |
| Glandularia tampensis | Tampa Verbena Tampa Mock-vervain | |
| Glandularia tumidula | Plains Mock Vervain | |
| Glandulicactus uncinatus | Chihuahuan Fishhook Cactus | |
| Glandulicactus uncinatus var. wrightii | Chihuahuan Fishhook Cactus Brown-flowered Hedgehog Cactus Catclaw Cactus | |
| Glaucocarpum suffrutescens | Shrubby Reed-mustard Uinta Basin Waxfruit Waxfruit Mustard | |
| Glaux maritima | Sea Milkwort Sea-milkwort | |
| Gleditsia aquatica | Water Locust Swamp Locust | |
| Gleditsia triacanthos | Honey Locust Common Honey Locust Thorny Common Honey Locust Honey Shucks Locust Sweet Locust Thorny Locust Honey Shucks Sweet Bean Tree | |
| Gleditsia ×texana | Hybrid Honeylocust | |
| Glehnia littoralis | American Silvertop American Glehnia | |
| Glehnia littoralis ssp. leiocarpa | American Silvertop Beach Silvertop | |
| Glossopetalon spinescens var. planitierum | Plains Greasebush | |
| Glossopetalon clokeyi | Clokey's Greasebush | |
| Glossopetalon pungens | Dwarf Greasebush Pungent Glossopetalon Smooth Greasewood | |
| Glossopetalon spinescens | Spiny Greasebush Nevada Greasewood | |
| Glossopetalon spinescens var. aridum | Spiny Greasebush | |
| Glossopetalon spinescens var. meionandrum | Spiny Greasebush | |
| Glossopetalon spinescens var. microphyllum | Spiny Greasebush | |
| Glossopetalon spinescens var. spinescens | Spiny Greasebush | |
| Glossopetalon texense | Texas Grease Bush Texas Greasebush | |
| Glyceria acutiflora | Creeping Manna Grass Creeping Mannagrass | |
| Glyceria arkansana | Arkansas Manna Grass Arkansas Mannagrass | |
| Glyceria borealis | Small Floating Mannagrass | |
| Glyceria canadensis | Rattlesnake Mannagrass | |
| Glyceria grandis | American Mannagrass American Manna Grass Tall Manna Grass Reed Meadowgrass | |
| Glyceria grandis var. grandis | American Mannagrass | |
| Glyceria grandis var. komarovii | American Manna Grass American Mannagrass | |
| Glyceria laxa | Limp Mannagrass Lax Mannagrass | |
| Glyceria leptostachya | Davy Mannagrass Narrow Mannagrass Slender-Spike Manna Grass | |
| Glyceria melicaria | Melic Mannagrass | |
| Glyceria nubigena | Great Smoky Mountain Manna Grass Great Smoky Mountain Mannagrass | |
| Glyceria obtusa | Atlantic Mannagrass | |
| Glyceria pulchella | Beautiful Glyceria Mackenzie Valley Manna Grass Mackenzie Valley Mannagrass | |
| Glyceria septentrionalis | Floating Mannagrass Northern Mannagrass Eastern Mannagrass | |
| Glyceria striata | Fowl Mannagrass | |
| Glyceria ×gatineauensis | Mannagrass | |
| Glyceria ×occidentalis | Northwestern Mannagrass Western Manna Grass Western Mannagrass | |
| Glycyrrhiza lepidota | American Licorice Wild Licorice | |
| Glyptopleura marginata | Carveseed White-margined Wax-plant | |
| Glyptopleura setulosa | Holy Dandelion | |
| Gnaphalium exilifolium | Slender Cudweed | |
| Gnaphalium palustre | Western Marsh Cudweed | |
| Gochnatia hypoleuca | Shrubby Bullseye | |
| Gomphrena caespitosa | Tufted Ball Clover Tufted Globe Amaranth Tufted Globe-amaranth | |
| Gomphrena haageana | Rio Grande Globe Amaranth | |
| Gomphrena nealleyi | Nealley's Globe Amaranth | |
| Gomphrena nitida | Pearly Globe Amaranth | |
| Gomphrena serrata | Arrasa Con Todo | |
| Gomphrena sonorae | Sonoran Ball Clover Sonoran Globe Amaranth Sonoran Globe-amaranth | |
| Goodmania luteola | Yellow Spinecape | |
| Goodyera oblongifolia | Western Rattlesnake Plantain Greenleaf Rattlesnake Plantain Green-leaved Rattlesnake Plantain | |
| Goodyera pubescens | Downy Rattlesnake Plantain | |
| Goodyera repens | Lesser Rattlesnake Plantain Dwarf Rattlesnake Plantain | |
| Goodyera tesselata | Checkered Rattlesnake Plantain | |
| Gordonia lasianthus | Gordonia Loblolly Bay | |
| Gossypianthus lanuginosus | Woolly Cottonflower | |
| Gossypianthus lanuginosus var. lanuginosus | Woolly Cottonflower | |
| Gossypianthus lanuginosus var. tenuiflorus | Woolly Cottonflower | |
| Gossypium hirsutum | Upland Cotton | |
| Gossypium hirsutum var. hirsutum | Upland Cotton | |
| Gossypium thurberi | Algodoncillo Thurber's Cotton Wild Cotton | |
| Gossypium tomentosum | Hawaii Cotton Hawaiian Cotton Huluhulu Mao | |
| Gouania hillebrandii | Hairy-fruit Chewstick Hairyfruit Chewstick | |
| Gouania lupuloides | Toothbrush Tree Whiteroot | |
| Gouania meyenii | Smoothfruit Chewstick | |
| Gouania vitifolia | Oahu Chewstick | |
| Govenia floridana | Tropical Govenia | |
| Grammitis baldwinii | Baldwin's Dwarf Polypody Baldwin's Dwarf-polypody | |
| Grammitis forbesiana | Forbes' Dwarf Polypody Forbes' Dwarf-polypody | |
| Grammitis hookeri | Hooker's Dwarf Polypody Hooker's Dwarf-polypody Makue Lau Lii | |
| Grammitis nimbata | West Indian Dwarf Polypody | |
| scientific name | common name(s) | image gallery |
