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 | |
| scientific name | common name(s) | image gallery |
