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 | |
| Holozonia filipes | Greene's White Crown Whitecrown | |
| Honckenya peploides | Seaside Sandplant | |
| Honckenya peploides ssp. diffusa | Seaside Sandplant | |
| Honckenya peploides ssp. major | Seaside Sandplant Seaside Sandwort | |
| Honckenya peploides ssp. robusta | Seaside Sandplant | |
| Hordeum arizonicum | Arizona Barley Arizona Foxtail | |
| Hordeum brachyantherum | Meadow Barley | |
| Hordeum brachyantherum ssp. brachyantherum | Meadow Barley | |
| Hordeum brachyantherum ssp. californicum | California Barley California Meadow Barley | |
| Hordeum depressum | Alkali Barley Dwarf Barley Low Barley | |
| Hordeum intercedens | Bob-tail Barley Bobtail Barley Little Barley Vernal Barley | |
| Hordeum jubatum | Foxtail Barley | |
| Hordeum jubatum ssp. intermedium | Foxtail Barley Intermediate Barley | |
| Hordeum jubatum ssp. jubatum | Foxtail Barley Squirreltail Barley Skunktail | |
| Hordeum pusillum | Little Barley | |
| Horkelia bolanderi | Bolander's Horkelia Border Horkelia | |
| Horkelia californica | California Horkelia | |
| Horkelia californica ssp. californica | California Horkelia | |
| Horkelia californica ssp. dissita | California Horkelia Tall Horkelia | |
| Horkelia californica ssp. frondosa | California Horkelia Leafy Horkelia | |
| Horkelia clevelandii | Cleveland's Horkelia | |
| Horkelia congesta | Sierra Horkelia | |
| Horkelia congesta ssp. congesta | Shaggy Horkelia Sierra Horkelia | |
| Horkelia congesta ssp. nemorosa | Josephine Horkelia Sierra Horkelia | |
| Horkelia cuneata | Wedge Leaf Horkelia Wedge Leaved Horkelia Wedgeleaf Horkelia | |
| scientific name | common name(s) | image gallery |
