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| scientific name | common name(s) | image gallery |
| Helianthus angustifolius | Swamp sunflower | |
| Helianthus maximiliani | Maximilian sunflower Max sunflower | |
| Hibiscus aculeatus | Comfortroot Big thicket hibiscus Pineland hibiscus | |
| Hibiscus coccineus | Scarlet rose-mallow Scarlet rosemallow Texas star hibiscus Wild red mallow | |
| Hibiscus laevis | Halberdleaf rosemallow Halberdleaf hibiscus Scarlet rose mallow | |
| Hymenocallis liriosme | Spider Lily Spring Spider Lily Spring spiderlily | |
| Hydrangea quercifolia | Oakleaf hydrangea Oak-leaf hydrangea | |
| Ilex decidua | Possumhaw Possumhaw Holly Deciduous Holly Winterberry Deciduous yaupon | |
| Ilex opaca | American holly Christmas holly | |
| Ilex verticillata | Common winterberry Michigan holly Black alder | |
| Ilex vomitoria | Yaupon Yaupon holly Cassina | |
| Ipomopsis rubra | Standing cypress Texas plume Red Texas star Red gilia | |
| Iris brevicaulis | Zigzag iris | |
| Iris virginica | Virginia iris Great Blue Flag | |
| Itea virginica | Virginia sweetspire Tassel-white | |
| Juniperus virginiana | Eastern red cedar Eastern redcedar Virginia juniper | |
| Lantana urticoides | Texas lantana Calico bush West Indian shrub-verbena | |
| Lindera benzoin | Northern spicebush Spicebush | |
| Liatris elegans | Blazing star Gay feather Pink-scale gayfeather Pinkscale blazing star | |
| Liatris pycnostachya | Prairie Blazing Star Kansas Ggayfeather Cat-tail Gayfeather Hairy Button-snakeroot | |
| Liquidambar styraciflua | Sweetgum American sweetgum | |
| Lobelia cardinalis | Cardinal flower | |
| Lonicera sempervirens | Coral honeysuckle Trumpet honeysuckle Woodbine | |
| Lupinus subcarnosus | Sandyland bluebonnet Texas bluebonnet | |
| Lupinus texensis | Texas bluebonnet Bluebonnet Texas lupine Buffalo clover Wolf-flower | |
| scientific name | common name(s) | image gallery |