| Hypolytrum capillare Schrad. ex Nees, 1842 |
| Hypolytrum glomeratum Schrad. ex Nees, 1842 |
| Hypolytrum longifolium (Rich.) Nees, 1834 |
| Hypolytrum longifolium subsp. nicaraguense (Liebm.) T. Koyama, 1967 |
| Hypolytrum nicaraguense Liebm., 1850 |
| Hypoporum Nees, 1834 |
| Hypoporum hirtellum (Sw.) Nees, 1834 |
| Hypoporum humile Nees, 1834 |
| Hypoporum interruptum Torr., 1836 |
| Hypoporum lithospermum (L.) Nees ex B.D. Jacks., 1895 |
| Hypoporum micrococcum Liebm., 1850 |
| Hypoporum nutans (Willd. ex Kunth) Nees, 1842 |
| Hypoporum purpurascens Liebm., 1850 |
| Hypoporum tenellum (Kunth) Nees, 1842 |
| Hypoporum verticillatum (Muhl.) Nees, 1834 |
| Iria (Rich. ex Pers.) Hedw., 1806 |
| Iria monostachya (L.) Kuntze, 1891 |
| Iria polymorpha (Boeckeler) Kuntze, 1891 |
| Isolepis R. Br., 1810 |
| Isolepis acicularis (L.) Schltdl., 1823 |