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| Genus species | Habit [ Bloom Color(s) ] | Common Name |
| Hepatica americana | Round-lobed Hepatica | |||
| Heuchera americana 'Tellico' | Alumroot | |||
| Heuchera longiflora | Long-flowered Alumroot | |||
| Heuchera villosa | Alumroot (large leaves) | |||
| Hexastylis arifolia | Wild Ginger (evergreen) | |||
| Hibiscus coccineus | Red Hibiscus | |||
| Hibicus grandiflorus | Great Rose Mallow | |||
| Hibiscus lasiocarpus | Rose Mallow | |||
| Hibiscus militaris | Scarlet Rose Mallow | |||
| Hibiscus moscheutos | Rose Mallow | |||
| Hydrastis canadensis | Goldenseal | |||
| Hydrophyllum virginianum | Virginia Waterleaf | |||
| Hypoxis hirsuta | Yellow Star Grass | |||
| Iris cristata 'alba' | Dwarf Iris (white) | |||
| Iris cristata (blue) | Dwarf Iris (blue) | |||
| Iris fulva | Copper Iris | |||
| Iris verna | Vernal Iris | |||
| Iris veriscolor | Blue Flag Iris |