Plants — G
- Gagea lutea
- Gagea serotina Common Alpine-lily
- Gagnepainia thoreliana
- Galanthus Snowdrop
- Galanthus nivalis Bucaneve
- Galanthus woronowii Green Snowdrop
- Galega officinalis
- Galeopsis
- Galeopsis segetum Downy Hemp-Nettle
- Galeopsis speciosa Bee Hemp-Nettle
- Galeopsis tetrahit Brittle-stem Hempnettle
- Galium aparine Bedstraw
- Galium boreale
- Galium odoratum sweet woodruff
- Galium palustre Common Marsh Bedstraw
- Galium verum
- Ganja
- Ganoderma
- Ganoderma lucidum Lacquered Bracket
- Garcinia Mangosteen genus
- Garcinia atroviridis
- Garcinia cowa Brindal Berry
- Garcinia dulcis Claudie mangosteen
- Garcinia gummi-gutta Malabar Tamarind
- Garcinia hanburyi Hanbury's garcinia
- Garcinia indica Goa-butter
- Garcinia kola
- Garcinia leptophylla
- Garcinia mangostana Gamboge
- Garcinia morella
- Garcinia schomburgkiana
- Garcinia sessilis
- Garcinia xanthochymus Garcinia
- Gardenia erythroclada
- Gardenia jasminoides Cape Jasmine
- Gardenia saxatilis
- Gardneria multiflora
- Gastrodia elata Cheonma (Tall gastrodia)
- Gaultheria insipida
- Gaultheria procumbens Checkerberry
- Geastraceae
- Gekko reevesii Reeves' Tokay Gecko
- Gelsemium elegans Graceful Jesamine
- Gelsemium sempervirens Carolina jasmine
- Genista tinctoria Dyer's Broom
- Gentiana Gentian
- Gentiana cruciata Cross Gentian
- Gentiana lutea
- Gentiana pneumonanthe
- Gentiana punctata
- Gentiana scabra Japanese gentian
- Gentianella alborosea Gentianella albo-rosea
- Gentianella amarella
- Gentianella nitida
- Gentianella quinquefolia Agueweed
- Geranium macrorrhizum Bigroot Geranium
- Geranium maculatum
- Geranium palustre
- Geranium pratense Meadow Crane's-bill
- Geranium psilostemon Armenian Crane's-Bill
- Geranium thunbergii Thunberg's Geranium
- Gethyllis namaquensis Namaqua Kukumakranka
- Geum aleppicum Aleppo Avens
- Geum quellyon Chiloe Avens
- Geum rivale
- Geum urbanum Avens
- Gillenia Bowman's root
- Ginkgo Gingko
- Ginkgo biloba ginkgo
- Gladiolus imbricatus
- Glaucium flavum
- Glechoma ground-ivies
- Glechoma hederacea Creeping Charlie
- Gleditsia sinensis Chinese honey locust
- Gleditsia triacanthos Common Honey-locust
- Glinus oppositifolius
- Gloriosa superba Climbing Liliy
- Glycosmis pentaphylla
- Glycyrrhiza Licorice
- Glycyrrhiza glabra licorice
- Glycyrrhiza korshinskyi
- Glycyrrhiza uralensis
- Gmelina arborea Gumhar
- Gnaphalium uliginosum Cudweed
- Gnetum Jointfir
- Gnetum leptostachyum
- Gnetum macrostachyum
- Gnetum montanum
- Gochnatia decora
- Gomphrena celosioides Bachelor's Button
- Gomphrena globosa Common globe amaranth
- Goniothalamus laoticus
- Grammatophyllum speciosum Giant orchid
- Grangea maderaspatana Madras carpet
- Graptophyllum pictum Caricature-Plant
- Gratiola officinalis Common Hedge Hyssop
- Grewia asiatica Phalsa
- Grewia paniculata
- Griffonia simplicifolia
- Grindelia squarrosa Broadleaf Gumweed
- Grona heterophylla Spanish-clover
- Guaco
- Guaiacum Lignum-Vitae
- Guaiacum officinale Common Lignum Vitae
- Guarea
- Gunnera Chilean rhubarb
- Gustavia gracillima
- Gymnanthemum extensum
- Gymnema inodorum
- Gymnema sylvestre gymnema
- Gymnocarpium dryopteris Common Oak Fern
- Gymnopetalum integrifolim
- Gymnosporia senegalensis Maytenus senegalensis
- Gynostemma pentaphyllum Five-leaf gynostemma
- Gynura bicolor Okinawa spinach
- Gynura japonica
- Gynura procumbens Longevity spinach
- Gynura pseudochina
- Gypsophila oldhamiana Manchurian baby's-breath
- Gypsophila vaccaria China Cockle, Cow Cockle, Cow-herb, Cow Soapwort, Spring Cockle, Dairy Pink