Complete list of species
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| scientific name | common name(s) | image gallery |
| Hippuris tetraphylla | Fourleaf Mare's-tail | |
| Hippuris vulgaris | Common Mare's-tail | |
| Hoffmannseggia drepanocarpa | Sicklepod Holdback | |
| Hoffmannseggia drummondii | Dwarf Nicker | |
| Hoffmannseggia glauca | Indian Rushpea Indian Rush-pea | |
| Hoffmannseggia microphylla | Wand Holdback | |
| Hoffmannseggia oxycarpa | Sharppod Rushpea | |
| Hoffmannseggia repens | Creeping Nicker | |
| Hoffmannseggia tenella | Slender Rushpea | |
| Hoita macrostachya | Large Leather-root | |
| Hoita orbicularis | Roundleaf Leather-root | |
| Hoita strobilina | Loma Prieta | |
| Holacantha stewartii | Stewart's Crucifixionthorn Stewart's Crucifixion-thorn Stewart Crucifixion Thorn | |
| Hollisteria lanata | False Spikeflower False Spineflower | |
| Holmgrenanthe petrophila | Rock Lady Rocklady | |
| Holocarpha heermannii | Heermann's Tarweed | |
| Holocarpha macradenia | Santa Cruz Tarplant | |
| Holocarpha obconica | San Joaquin Tarweed | |
| Holocarpha obconica ssp. autumnalis | San Joaquin Tarweed | |
| Holocarpha obconica ssp. obconica | San Joaquin Tarweed | |
| Holocarpha virgata | Narrow Tarplant Pitgland Tarweed Yellowflower Tarweed | |
| Holocarpha virgata ssp. elongata | Graceful Tarplant Wand Tarbush | |
| Holocarpha virgata ssp. virgata | Narrow Tarplant Yellowflower Tarweed | |
| Holodiscus discolor | Ocean Spray Hillside Ocean-spray Cream Bush Mountain Spray | |
| Holodiscus dumosus | Rockspirea Glandular Oceanspray Bush Rockspirea Cream Bush | |
| scientific name | common name(s) | image gallery |
