| G |
| Gaillardia pulchella, Blanket flower; Gaillardia |
| Gaillardia pulchella, Gaillardia; Blanket flower |
| Gaillardia x grandiflora, Blanket flower |
| Galactia regularis, Milk pea |
| Galanthus nivalis; G. elwesii, Snow-drops |
| Galax aphylla, Galax |
| Galearis spectablis (Orchis spectabillis), Showy orchis |
| Galium aparine, Bedstraw; Cleavers |
| Galium odoratum, Sweet woodruff |
| Galtonia candicans, Cape hyacinth; Summer hyacinth; Spire lily |
| Gardenia augusta 'Radicans', Creeping gardenia |
| Gardenia augusta (G. jasminoides), Gardenia; Cape jasmine |
| Gardenia jasminoides 'Kleim's Hardy', Kleim's Hardy gardenia |
| Gardenia jasminoides 'Radicans', Creeping gardenia |
| Gaultheria procumbens, Spreading wintergreen; Teaberry; Common wintergreen |
|
Gaura lindheimeri, White gaura |
| Gazania rigens, Gazania; Treasure flower |
| Gelseminum ranki, Swamp jessamine |
| Gelsemium sempervirens, Carolina jasmine |
| Gelsemium sempervirens, Carolina jasmine |
| Genista lydia, Lydia broom |
| Genista lydia, Lydia broom |
| Genista pilosa, Silkyleaf woadwaxen |
| Genista tinctoria, Common woadwaxen; Dyer's greenwood |
| Genista tinctoria, Common woadwaxen; Dyer's greenwood |
| Genista tinctoria; G. pilosa; G. Sagittalis, Genista; Broom |
| Gentian quinquefolia, Stiff gentian; Gall-of-the-earth |
| Gentian saponaria, Soapwort gentian |
| Gentiana spp., Gentian |
| Geranium manculatum, Wild geranium; Cranesbill |
|
Geranium sanguineum, Cranesbill geranium |
| Geranium sanguineum, Cranesbill geranium |
| Gerardia flava, Yellow false foxglove; Smooth false foxglove; Fern-leaf false foxglove |
| Gerardia laevigata = Aureolaria laevigata, Smooth false foxglove |
| Gerardia purpurea, Purple gerardia |
|
Gerbera jamesonii, Gerbera daisy |
|
Geum spp., Avens |
| Gillenia trifoliata = Porteranthus trifoliatus, Indian physic; Bowman's root |
| Ginkgo biloba, Ginkgo; Maidenhair tree |
|
Gladiolus byzantinus, Byzantine gladiolus |
| Gladiolus, Glads; Sword lilies |
| Glechoma hederacea, Ground-ivy; Gill-over-the-hill |
| Gleditsia triacanthos, Honeylocust |
| Gleditsia triocanthus var. inernis, Thornless common honeylocust |
| Gloriosa superba, Glory lily; Climbing lily; Flame lily |
| Gloriosa, Glory flower; Climbing lily; Flame lily |
| Glyceria maxima 'Variegata', Variegated manna grass |
| Gnaphalium obtusifolium var. praecox, Rabbit tobacco; Cudweed |
| Gomphrena globosa, Globe amaranth |
| Goodyera pubescens, Rattle-snake plantain; Downy rattlesnake plantain |
| Gordonia lasianthus, Loblolly bay |
| Gratiola viscidula, Hedge hyssop |
| Gymnocladus dioicus, Kentucky coffeetree |
|
Gypsophila paniculata, Baby's breath |