| Haplocalymma S.F. Blake, 1916 |
| Haplocalymma microcephala (Greenm.) S.F. Blake, 1916 |
| Haplocalymma woronowii S.F. Blake, 1930 |
| Haploesthes A. Gray, 1849 |
| Haploesthes fruticosa B.L. Turner, 1975 |
| Haploesthes greggii A. Gray, 1849 |
| Haploesthes greggii var. greggii A. Gray, 1849 |
| Haploesthes greggii var. multiflora I.M. Johnst., 1941 |
| Haploesthes hintoniana B.L. Turner, 2013 |
| Haploesthes robusta I.M. Johnst., 1941 |
| Haplopappus Cass., 1828 |
| Haplopappus arborescens (A. Gray) H.M. Hall, 1919 |
| Haplopappus arborescens var. peninsularis Moran, 1969 |
| Haplopappus arenarius Benth., 1844 |
| Haplopappus arenarius var. incisifolius I.M. Johnst., 1924 |
| Haplopappus arenarius var. rossii I.M. Johnst., 1924 |
| Haplopappus bartlettii S.F. Blake, 1932 |
| Haplopappus berberidis A. Gray, 1884 |
| Haplopappus cuneatus A. Gray, 1873 |
| Haplopappus enormidens Moran, 1976 |