Index of plants by genus
| Species | Common Name | Family |
| Galium lanceolatum | Lance-leaved Wild Licorice | Rubiaceae |
| Galium obtusum | Wild Madder | Rubiaceae |
| Galium palustre | Common Marsh Bedstraw | Rubiaceae |
| Galium pilosum | Hairy Bedstraw | Rubiaceae |
| Galium trifidum | Three-flowered Bedstraw | Rubiaceae |
| Galium triflorum | Fragrant Bedstraw | Rubiaceae |
| Gaultheria hispidula | Creeping Snowberry | Ericaceae |
| Gaultheria procumbens | Wintergreen | Ericaceae |
| Gaylussacia baccata | Box Huckleberry | Ericaceae |
| Gaylussacia bigeloviana | Bog Huckleberry | Ericaceae |
| Gaylussacia frondosa | Blue Huckleberry | Ericaceae |
| Gentiana andrewsii | Andrew's Bottle Gentian | Gentianaceae |
| Gentiana autumnalis | Pine Barren Gentian | Gentianaceae |
| Gentiana clausa | Meadow Bottle Gentian | Gentianaceae |
| Gentiana linearis | Narrow-leaved Gentian | Gentianaceae |
| Gentianella quinquefolia | Stiff Gentian | Gentianaceae |
| Gentianopsis crinita | Common Fringed Gentian | Gentianaceae |
| Gentianopsis virgata | Smaller Fringed Gentian | Gentianaceae |
| Geranium bicknellii | Northern Crane's Bill | Geraniaceae |
| Geranium carolinianum | Carolina Crane's Bill | Geraniaceae |
| Geranium maculatum | Wild Geranium | Geraniaceae |
| Geranium robertianum | Herb Robert | Geraniaceae |
| Geum aleppicum | Yellow Avens | Rosaceae |
| Geum canadense | White Avens | Rosaceae |
| Geum fragarioides | Barren Strawberry | Rosaceae |
| Geum laciniatum | Rough Avens | Rosaceae |
| Geum macrophyllum | Large-leaved Avens | Rosaceae |
| Geum peckii | White Mountain Avens | Rosaceae |
| Geum rivale | Purple Avens | Rosaceae |
| Geum triflorum | Prairie Smoke | Rosaceae |
| Geum vernum | Spring Avens | Rosaceae |
| Geum virginianum | Cream Avens | Rosaceae |
| Gillenia trifoliata | Indian Physic | Rosaceae |
| Gleditsia triacanthos | Honey Locust | Fabaceae |
| Glyceria canadensis | Rattlesnake Mannagrass | Poaceae |
| Glyceria grandis | American Manna Grass | Poaceae |
| Glyceria melicaria | Melic Mannagrass | Poaceae |
| Glyceria striata | Fowl Mannagrass | Poaceae |
| Glycyrrhiza lepidota | American Licorice | Fabaceae |
| Goodyera pubescens | Downy Rattlesnake Plantain | Orchidaceae |
| Goodyera repens | Lesser Rattlesnake Plantain | Orchidaceae |
| Goodyera tesselata | Checkered Rattlesnake Plantain | Orchidaceae |
| Gratiola aurea | Golden Hedge-hyssop | Plantaginaceae |
| Gratiola neglecta | Clammy Hedge-hyssop | Plantaginaceae |
| Gymnocarpium dryopteris | Oak Fern | Dryopteridaceae |
| Gymnocladus dioicus | Kentucky Coffeetree | Leguminosae |
© 2004-2010 Michael Hough