| Homochrominae Benth. & Hook. f., 1873 |
| Hopkirkia Spreng., 1818 |
| Hulsea Torr. & A. Gray, 1858 |
| Hulsea brevifolia A. Gray, 1868 |
| Hulsea californica Torr. & A. Gray, 1858 |
| Hulsea mexicana Rydb., 1914 |
| Hulsea vestita A. Gray, 1865 |
| Hulseinae B.G. Baldwin, 2002 |
| Hunteria DC., 1836 |
| Hybridella Cass., 1817 |
| Hybridella anthemidifolia (B.L. Rob. & Greenm.) Olsen, 1977 |
| Hybridella globosa Cass., 1821 |
| Hydrodyssodia B.L. Turner, 1988 |
| Hydrodyssodia stevensii (McVaugh) B.L. Turner, 1988 |
| Hydropectis Rydb., 1914 |
| Hydropectis aquatica (S. Watson) Rydb., 1916 |
| Hydropectis estradii B.L. Turner, 1995 |
| Hydropectis stevensii McVaugh, 1972 |
| Hydrophytum Eschw., 1823 |
| Hymenatherum Cass., 1817 |