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| scientific name | common name(s) | image gallery |
| Gaylussacia brachycera | Box huckleberry | |
| Gaultheria procumbens | Eastern teaberry Wintergreen Checkerberry | |
| Gentiana andrewsii | Closed bottle gentian Closed gentian Bottle gentian | |
| Gentianopsis crinita | Greater fringed gentian Fringed gentian | |
| Geranium maculatum | Spotted geranium Wild geranium Cranesbill | |
| Gillenia trifoliata | Bowman's root Indian physic | |
| Goodyera pubescens | Downy rattlesnake plantain | |
| Gymnocladus dioicus | Kentucky coffeetree Stump tree | |
| Halesia carolina | Carolina silverbell | |
| Hamamelis vernalis | Ozark witch-hazel Vernal witch-hazel | |
| Hamamelis virginiana | Witch hazel American witch hazel | |
| Heuchera americana | American alumroot | |
| Hexastylis arifolia | Littlebrownjug Heartleaf Evergreen wild ginger | |
| Helenium autumnale | Common sneezeweed Fall sneezeweed Autumn sneezeweed | |
| Helianthus divaricatus | Woodland sunflower Rough sunflower | |
| Hepatica nobilis var. acuta | Sharplobe hepatica Sharp-lobed hepatica Mountain hepatica | |
| Hepatica nobilis var. obtusa | Roundlobe hepatica Round-lobed hepatica Liverleaf | |
| Hexastylis shuttleworthii | Largeflower heartleaf Shuttleworth's ginger | |
| Heuchera villosa | Hairy alumroot | |
| Heterotheca villosa | Hairy false goldenaster Hairy golden-aster | |
| Hibiscus moscheutos | Crimsoneyed rosemallow Crimson-eyed rose-mallow Marshmallow hibiscus | |
| Hydrangea arborescens | Wild hydrangea Sevenbark | |
| Hydrastis canadensis | Goldenseal | |
| Hymenocallis caroliniana | Carolina spider-lily Carolina spiderlily Rain lily | |
| Hypericum densiflorum | Bushy St. Johnswort | |
| Hypericum frondosum | Cedarglade St. Johnswort Golden St. Johnswort | |
| Hypoxis hirsuta | Common goldstar Yellow star-grass Eastern yellow star-grass | |
| Hydrangea quercifolia | Oakleaf hydrangea Oak-leaf hydrangea | |
| Hydrophyllum virginianum | Eastern waterleaf Shawnee salad Virginia waterleaf | |
| Ilex glabra | Inkberry Gallberry | |
| Ilex opaca | American holly Christmas holly | |
| Ilex verticillata | Common winterberry Michigan holly Black alder | |
| Iris cristata | Dwarf crested iris | |
| Iris verna | Dwarf violet iris Vernal iris Dwarf iris | |
| Iris versicolor | Harlequin blueflag Northern blue flag | |
| Iris virginica | Virginia iris Great Blue Flag | |
| Itea virginica | Virginia sweetspire Tassel-white | |
| Jeffersonia diphylla | Twinleaf | |
| Juglans cinerea | Butternut White walnut | |
| Juniperus communis | Common juniper | |
| Juglans nigra | Black walnut Eastern black walnut | |
| Juncus tenuis | Poverty rush Path rush | |
| Juniperus virginiana | Eastern red cedar Eastern redcedar Virginia juniper | |
| Larix laricina | Tamarack American larch Hacmatack | |
| Leucothoe axillaris | Coastal doghobble Coast leucothoe | |
| Liatris aspera | Tall blazing star Tall gayfeather Rough blazing star Button snakeroot | |
| Lindera benzoin | Northern spicebush Spicebush | |
| Liatris scariosa | Devil's bite Large blazing star Savanna blazing star | |
| Liatris spicata | Dense blazing star Dense gayfeather Marsh blazing star | |
| Liquidambar styraciflua | Sweetgum American sweetgum | |
| scientific name | common name(s) | image gallery |