Printer Friendly: Species List | List with Images | List with QR Tags to Mobile
| scientific name | common name(s) | image gallery |
| Hesperocyparis arizonica | Arizona cypress | |
| Heterotheca canescens | Gray golden-aster Hoary false goldenaster | |
| Hechtia glomerata | Guapilla | |
| Helianthus grosseserratus | Sawtooth sunflower | |
| Helianthus maximiliani | Maximilian sunflower Max sunflower | |
| Helianthus occidentalis | Fewleaf sunflower Western sunflower | |
| Hesperaloe parviflora | Red yucca Coral yucca Red flowered false yucca Redflower false yucca Samandoque Yellow yucca | |
| Heimia salicifolia | Shrubby yellowcrest | |
| Hibiscus coulteri | Coulter hibiscus Desert rose-mallow Desert rosemallow | |
| Hibiscus laevis | Halberdleaf rosemallow Halberdleaf hibiscus Scarlet rose mallow | |
| Hibiscus lasiocarpos | Rose-mallow Rosemallow Woolly mallow Wooly Rose-mallow | |
| Hibiscus martianus | Heartleaf rosemallow Tulipan del Monte Heartleaf Hibiscus | |
| Hyptis alata | Clustered bushmint | |
| Hydrocotyle umbellata | Manyflower marshpennywort Water-pennywort Money-plant | |
| Ilex decidua | Possumhaw Possumhaw Holly Deciduous Holly Winterberry Deciduous yaupon | |
| Ilex vomitoria | Yaupon Yaupon holly Cassina | |
| Indigofera miniata | Coastal indigo Scarlet Pea Texas Indigo Western indigo | |
| Ipomoea cordatotriloba | Tievine Purple bindweed | |
| Ipomoea lindheimeri | Lindheimer's morning-glory Blue Morning Glory | |
| Ipomopsis rubra | Standing cypress Texas plume Red Texas star Red gilia | |
| Iris giganticaerulea | Blue flag Giant blue iris | |
| Iris hexagona | Dixie iris | |
| Juncus effusus | Common rush Soft Rush | |
| Juglans major | Arizona walnut | |
| Juglans microcarpa | Little walnut Nogalito Texas walnut Texas black walnut River walnut | |
| scientific name | common name(s) | image gallery |