| Haplopappus vernicosus Brandegee, 1889 |
| Haplopappus wigginsii S.F. Blake, 1935 |
| Harleya S.F. Blake, 1932 |
| Harleya oxylepis (Benth.) S.F. Blake, 1932 |
| Harpalium (Cass.) Cass., 1825 |
| Harpephora Endl., 1841 |
| Hartmannia DC., 1836 |
| Hartmannia fasciculata DC., 1836 |
| Hartmannia pungens Hook. & Arn., 1839 |
| Hazardia Greene, 1887 |
| Hazardia berberidis (A. Gray) Greene, 1894 |
| Hazardia cana (A. Gray) Greene, 1887 |
| Hazardia enormidens (Moran) W.D. Clark, 1979 |
| Hazardia ferrisiae (S.F. Blake) W.D. Clark, 1979 |
| Hazardia odontolepis (Moran) W.D. Clark, 1979 |
| Hazardia orcuttii (A. Gray) Greene, 1894 |
| Hazardia rosarica (Moran) W.D. Clark, 1979 |
| Hazardia squarrosa (Hook. & Arn.) Greene, 1894 |
| Hazardia stenolepis (H.M. Hall) Hoover, 1970 |
| Hazardia vernicosa (Brandegee) W.D. Clark, 1979 |