| Genus | #images |
|---|---|
| Gagea Salisb. | 33 |
| Gagnepainia K.Schum. | 9 |
| Gaillardia Foug | 5 |
| Galanthus L. | 15 |
| Galax Sims | 1 |
| Galega L. | 11 |
| Galeopsis L. | 8 |
| Galinsoga Ruiz & Pav. | 6 |
| Galium L. | 26 |
| Galtonia Decne. | 1 |
| Gamocarpha DC. | 7 |
| Garberia A.Gray | 3 |
| Garcinia L. | 13 |
| Garnieria Brongn. & Gris | |
| Gaultheria Kalm ex L. | 13 |
| Gaylussacia Kunth | 20 |
| Gayophytum A.Juss. | |
| Geissanthus Bentham & Hooker | |
| Geissorhiza Ker Gawl. | 6 |
| Genlisea A.St.-Hil. | 7 |
| Gentiana Tourn. ex L. | 113 |
| Gentianella Moench | 22 |
| Gentianopsis Ma | 24 |
| Gentlea Lundell | |
| Geogenanthus Ule | 3 |
| Geohintonia Glass & W.A. Fitz Maur. | 1 |
| Geomitra Becc. | |
| Geostachys (Baker) Ridl. | 1 |
| Geranium Tourn. ex L. | 88 |
| Gerbera L. | 5 |
| Gesneria Plum. ex L. | 2 |
| Gethyllis L. | 22 |
| Geum L. | 47 |
| Gevuina Molina | |
| Gibbaeum Haw. ex N.E.Br | 1 |
| Gilia Ruiz & Pav. | 55 |
| Gillenia Moench | 2 |
| Gladiolus Tourn. ex L. | 32 |
| Glaucidium Siebold & Zucc. | 9 |
| Glaucium Mill. | 21 |
| Glaux Medik. | |
| Glebionis Cass. | 13 |
| Glehnia F.Schmidt ex Miq. | 1 |
| Glischrocaryon Endl. | 3 |
| Globba L. | 27 |
| Globularia Tourn. ex L. | 19 |
| Glomeropitcairnia Mez | |
| Gloriosa L. | 6 |
| Glottiphyllum Haw. ex N.E.Br | 2 |
| Gloxinia L'Hér. | 6 |
| Glumicalyx Hiern | 5 |
| Gluta L. | 5 |
| Glycosmis Corrêa | 7 |
| Gnaphalium L. | |
| Goetzea Wydler | 2 |
| Gomphocarpus R.Br. | 18 |
| Gompholobium Sm. | 4 |
| Gomphostemma Wall. ex Benth. | 4 |
| Gongylocarpus Schltdl. & Cham. | |
| Gonialoe (Baker) Boatwr. & J.C.Manning | 7 |
| Goniolimon Boiss. | 3 |
| Goniophlebium (Blume) C.Presl | 1 |
| Goniothalamus (Blume) Hook.f. & Thomson | |
| Gonolobus Michx. | 5 |
| Gonospermum Less. | |
| Goodenia Sm. | 157 |
| Gordonia Ellis | 7 |
| Gorteria L. | 10 |
| Gossypium L. | 23 |
| Goudaea W.Till & Barfuss | 11 |
| Grahamia Gillies ex Hook. & Arn. | |
| Grammitis Sw. | 1 |
| Graphardisia (Mez) Lundell | |
| Graptopetalum Rose | 21 |
| Graptoveria Gossot | 9 |
| Gratiola L. | |
| Grayia Hook. & Arn. | 2 |
| Greeneocharis Gürke & Harms | 4 |
| Gregbrownia W.Till & Barfuss | 2 |
| Greigia Regel | |
| Grenacheria Mez | |
| Grevillea R.Br. ex Knight | 35 |
| Grewia L. | 3 |
| Griffinia Ker Gawl. | 11 |
| Grimmia Hedw. | 3 |
| Grona Lour. | 4 |
| Grusonia Rchb. f. ex Britton & Rose | |
| Gunnera L. | 18 |
| Gunniopsis Pax | 3 |
| Gustavia L. | 9 |
| Guzmania Ruiz & Pav. | 72 |
| Gymnocalycium Pfeiff. ex Mittler | 100 |
| Gymnodiscus Less. | |
| Gymnosiphon Blume | 7 |
| Gymnosphaera Blume | 1 |
| Gymnostachys R.Br. | 1 |
| Gymnosteris Greene | 7 |
| Gymnotheca Decne. | |
| Gynoxys Cass. | |
| Gynura Cass. | |
| Gypsophila L. | 15 |