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| scientific name | common name(s) | image gallery |
| Gleditsia triacanthos | Honey locust Common Honey-locust Honey-locust Thornless common honey-locust Honey shucks | |
| Gordonia lasianthus | Gordonia Loblolly bay | |
| Halesia diptera | Two-wing silverbell Silver bell Two-winged silverbell Snowdrop tree American snowdrop tree | |
| Hamamelis virginiana | Witch hazel American witch hazel | |
| Helianthus angustifolius | Swamp sunflower | |
| Heliopsis helianthoides | Smooth oxeye Oxeye sunflower False sunflower | |
| Hibiscus coccineus | Scarlet rose-mallow Scarlet rosemallow Texas star hibiscus Wild red mallow | |
| Hibiscus grandiflorus | Swamp rosemallow Swamp rose-mallow Pink swamp hibiscus Large-flowered hibiscus | |
| Hibiscus moscheutos | Crimsoneyed rosemallow Crimson-eyed rose-mallow Marshmallow hibiscus | |
| Hydrolea corymbosa | Skyflower Tall Hydrolea | |
| Hypericum hypericoides | St. Andrew's Cross | |
| Hydrangea quercifolia | Oakleaf hydrangea Oak-leaf hydrangea | |
| Ilex amelanchier | Sarvis holly Swamp holly | |
| Ilex decidua | Possumhaw Possumhaw Holly Deciduous Holly Winterberry Deciduous yaupon | |
| Illicium floridanum | Florida anisetree Florida anise Anise tree Stinkbush | |
| Ilex glabra | Inkberry Gallberry | |
| Ilex myrtifolia | Myrtle dahoon Myrtle leaf holly Myrtle holly | |
| Illicium parviflorum | Yellow anisetree Small anisetree Star anise | |
| Ilex verticillata | Common winterberry Michigan holly Black alder | |
| Ilex vomitoria | Yaupon Yaupon holly Cassina | |
| Ipomoea pes-caprae | Railroad vine Goat-foot morning glory Bayhops Beach morning glory | |
| Ipomopsis rubra | Standing cypress Texas plume Red Texas star Red gilia | |
| Iris hexagona | Dixie iris | |
| Iris virginica | Virginia iris Great Blue Flag | |
| Itea virginica | Virginia sweetspire Tassel-white | |
| scientific name | common name(s) | image gallery |