* Gagea
* Gaillardia
* Galanthus (snowdrop)
* Galax
* Galega
* Galium (bedstraw)
* Galtonia
* Gardenia
* Garrya
* Gasteria
* Gaultheria
* Gaura
* Gaylussacia (huckleberry)
* Gazania
* Geissorhiza
* Gelsemium
* Genista
* Gentiana (gentian)
* Gentianopsis
* Geranium (cranesbill, not same as Pelargonium)
* Gerbera
* Gesneria
* Geum (avens)
* Gevuina
* Gibbaeum
* Gilia
* Gillenia
* Ginkgo
* Gladiolus
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* Glaucidium
* Glaucium
* Gleditsia (honey locust)
* Globba
* Globularia (globe daisy)
* Gloriosa
* Glottiphyllum
* Gloxinia
* Glyceria
* Glycyrrhiza
* Gomphocarpus
* Gomphrena
* Goniolimon
* Goodyera (jewel orchid)
* Gordonia
* Graptopetalum
* Graptophyllum
* Graptoveria (hybrid genus)
* Grevillea
* Grewia
* Greyia
* Grindelia
* Griselina
* Gunnera (dinosaur food)
* Guzmania
* Gymnocalycium
* Gymnocarpium
* Gymnocladus
* Gynandriris
* Gynura
* Gypsophila
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