Complete list of species
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| scientific name | common name(s) | image gallery |
| Hieracium kalmii var. subintegrum | Kalm's Hawkweed | |
| Hieracium lachenalii | Common Hawkweed | |
| Hieracium lemmonii | Lemmon's Hawkweed | |
| Hieracium longiberbe | Longbeard Hawkweed | |
| Hieracium longipilum | Hairy Hawkweed | |
| Hieracium marianum | Maryland Hawkweed | |
| Hieracium megacephalon | Coastal Plain Hawkweed | |
| Hieracium paniculatum | Allegheny Hawkweed | |
| Hieracium prenanthoides | Hawkweed | |
| Hieracium pringlei | Pringle's Hawkweed | |
| Hieracium robinsonii | Robinson's Hawkweed | |
| Hieracium rusbyi | Rusby's Hawkweed | |
| Hieracium scabrum | Rough Hawkweed | |
| Hieracium scabrum var. intonsum | Rough Hawkweed | |
| Hieracium scabrum var. scabrum | Rough Hawkweed | |
| Hieracium scabrum var. tonsum | Rough Hawkweed | |
| Hieracium schultzii | Roughstem Hawkweed | |
| Hieracium scouleri | Hounds Tongue Hawkweed Scouler's Hawkweed Scouler's Woollyweed | |
| Hieracium scouleri var. albertinum | Scouler's Hawkweed Scouler's Woollyweed | |
| Hieracium scouleri var. nudicaule | Naked Stemmed Scouler's Hawkweed Scouler's Woollyweed | |
| Hieracium scouleri var. scouleri | Scouler's Hawkweed Scouler's Woollyweed | |
| Hieracium scribneri | Scribner's Hawkweed | |
| Hieracium triste | Woolly Hawkweed | |
| Hieracium triste var. fulvum | Woolly Hawkweed | |
| Hieracium triste var. triste | Woolly Hawkweed | |
| Hieracium umbellatum | Narrowleaf Hawkweed | |
| Hieracium venosum | Rattlesnakeweed Rattlesnake Weed | |
| Hieracium ×alleghaniense | Hawkweed | |
| Hieracium ×fassettii | Fassett's Hawkweed Hawkweed | |
| Hieracium ×fassettii var. fassettii | Fassett's Hawkweed Hawkweed | |
| Hieracium ×fassettii var. mendicum | Fassett's Hawkweed Hawkweed | |
| Hieracium ×fassettii var. wisconsinense | Hawkweed | |
| Hieracium ×fernaldii | Hawkweed | |
| Hieracium ×grohii | Hawkweed | |
| Hieracium ×grohii var. farwellii | Hawkweed | |
| Hieracium ×grohii var. grohii | Hawkweed | |
| Hierochloe hirta | Northern Sweetgrass | |
| Hierochloe hirta ssp. arctica | Northern Sweet Grass Northern Sweetgrass | |
| Hierochloe occidentalis | California Sweetgrass California Sweet Grass California Vanilla Grass | |
| Hierochloe odorata | Sweetgrass Vanilla Grass Sweet Grass | |
| Hierochloe pauciflora | Arctic Sweet Grass Arctic Sweetgrass | |
| Hilaria belangeri | Curly Mesquite Grass Curly Mesquite | |
| Hilaria belangeri var. belangeri | Curly-mesquite | |
| Hilaria belangeri var. longifolia | Longleaf Curly Mesquite Longleaf Curly-mesquite | |
| Hilaria swallenii | Swallen's Curly Mesquite Swallen's Curly-mesquite | |
| Hillebrandia sandwicensis | Aka'aka'aka | |
| Hippocratea volubilis | Medicine Vine Medicine-vine | |
| Hippomane mancinella | Manchineel Beach-apple Death-apple Tree Of Death | |
| Hippuris lanceolata | Lanceleaf Mare's Tail Lanceleaf Mare's-tail Panarctic Mare's-tail | |
| Hippuris montana | Mountain Mare's Tail Mountain Mare's-tail | |
| 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 |
