| Gaillardia aestivalis (Walt.) H. Rock | map | images (1) |
| Gaillardia pulchella Foug. | map | images (1) |
| Galactia elliottii Nutt. | map | |
| Galactia erecta (Walt.) Vahl | map | |
| Galactia mollis Michx. | map | |
| Galactia regularis (L.) B.S.P. | map | |
| Galactia volubilis (L.) Britt. | map | images (1) (2) |
| Galax urceolata (Poir.) Brummitt | map | |
| Galearis spectabilis (L.) Raf. | map | |
| Galinsoga quadriradiata Ruiz & Pavon | map | images (1) |
| Galium aparine L. | map | images (1) (2) |
| Galium circaezans Michx. |  map | |
| Galium hispidulum Michx. | map | |
| Galium lanceolatum Torr. | map | |
| Galium latifolium Michx. | map | images (1) (2) |
| Galium obtusum Bigelow var. filifolium (Wiegand) Fernald | map | |
| Galium obtusum Bigelow var. obtusum | map | images (1) (2) |
| Galium pilosum Ait. | map | images (1) |
| Galium tinctorium (L.) Scop. | map | |
| Galium triflorum Michx. | map | |
| Galium uniflorum Michx. | map | |
| Gamochaeta falcata (Lam.) Cabrera | map | |
| Gamochaeta purpurea (L.) Cabrera | map | images (1) (2) (3) |
| Gaultheria procumbens L. | map | |
| Gaura angustifolia Michx. | map | images (1) (2) |
| Gaura biennis L. | map | |
| Gaura filipes Spach | map | |
| Gaura parviflora Dougl. ex Lehm. | map | |
| Gaura sinuata Nutt. ex Ser. | map | |
| Gaylussacia baccata (Wangenh.) K. Koch | map | |
| Gaylussacia dumosa (Andr.) Torr. & Gray | map | images (1) (2) |
| Gaylussacia frondosa (L.) Torr. & Gray ex Torr. | map | |
| Gaylussacia mosieri (L.) Small | map | |
| Gaylussacia tomentosa (Gray) Pursh ex Small | map | |
| Gaylussacia ursina (M.A. Curtis) Torr. & Gray ex Gray | map | images (1) (2) (3) (4) |
| Gelsemium rankinii Small | map | |
| Gelsemium sempervirens St.-Hil. | map | images (1) (2) |
| Gentiana autumnalis L. | map | |
| Gentiana catesbaei Walt. | map | |
| Gentiana decora Pollard | map | images (1) (2) (3) |
| Gentiana saponaria L. | map | |
| Gentiana villosa L. | map | |
| Gentianella quinquefolia (L.) Small | map | |
| Geranium carolinianum L. | map | images (1) (2) |
| Geranium dissectum L. | map | |
| Geranium maculatum L. | map | |
| Geranium molle L. | map | |
| Geranium pusillum L. | map | |
| Geum canadense Jacq. | map | |
| Geum laciniatum Murr. | map | |
| Geum virginianum L. | map | |
| Gladiolus papilio Hook. f. | map | |
| Gladiolus x gandavensis Van Houtte | map | |
| Glandularia canadensis (L.) Nutt. | map | |
| Glandularia pulchella (Sweet) Troncoso | map | images (1) (2) |
| Glechoma hederacea L. | map | images (1) (2) |
| Gleditsia aquatica Marsh. | map | |
| Gleditsia triacanthos L. | map | images (1) (2) (3) |
| Glottidium vesicarium (Jacq.) Harper | map | images (1) (2) (3) |
| Glyceria obtusa (Muhl.) Trin. | map | |
| Glyceria septentrionalis A.S. Hitchc. | map | |
| Glyceria striata (Lam.) A.S. Hitchc. | map | |
| Glycine max (L.) Merr. | map | |
| Gnaphalium helleri Britt. | map | |
| Gnaphalium obtusifolium L. | map | images (1) (2) |
| Gnaphalium stramineum Kunth | map | |
| Gonolobus suberosus auct. non (L.) R. Br. | map | images (1) (2) |
| Goodyera pubescens (Willd.) R. Br. ex Ait. f. | map | images (1) (2) (3) (4) |
| Gordonia lasianthus (L.) Ellis | map | |
| Gratiola aurea Pursh | map | |
| Gratiola brevifolia Raf. | map | |
| Gratiola neglecta Torr. | map | images (1) |
| Gratiola pilosa Michx. | map | |
| Gratiola ramosa Walt. | map | |
| Gratiola virginiana L. | map | images (1) |
| Gratiola viscidula Pennell | map | |
| Guilleminea densa (Humb. & Bonpl. ex Willd.) var. aggregata Uline & Bray | map | |
| Gymnopogon ambiguus (Michx.) B.S.P. | map | |
| Gymnopogon brevifolius Trin. | map | |
| Gymnostyles stolonifera (Brot.) Tutin | map | |