| 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 |
| Hymenatherum acerosum (DC.) A. Gray, 1852 |
| Hymenatherum anomalum Canby & Rose, 1891 |
| Hymenatherum aurantiacum Brandegee, 1908 |
| Hymenatherum belenidium DC., 1838 |
| Hymenatherum boeberoides A. Gray, 1852 |
| Hymenatherum concinnum A. Gray, 1886 |