| Homalopetalum Rolfe, 1896 |
| Homalopetalum costaricense Schltr., 1923 |
| Homalopetalum kienastti (Rchb. f.) Withner, 1998 |
| Homalopetalum pachyphyllum (L.O. Williams) Dressler, 1964 |
| Homalopetalum pumilio (Rchb. f.) Schltr., 1923 |
| Homalopetalum pumilum (Ames) Dressler, 1964 |
| Hormidium Lindl. ex Heynh., 1841 |
| Hormidium boothianum (Lindl.) Brieger, 1960 |
| Hormidium brassavolae (Rchb. f.) Brieger, 1977 |
| Hormidium guttatum (A. Rich. & Galeotti) Brieger, 1977 |
| Hormidium humile (Cogn.) Schltr., 1920 |
| Hormidium miserum (Lindl.) Benth. & Hook. f., 1880 |
| Hormidium panthera (Rchb. f.) Brieger, 1977 |
| Hormidium pseudopygmaeum Finet, 1899 |
| Hormidium pulchellum (A. Rich. & Galeotti) Benth. & Hook. f., 1880 |
| Hormidium pygmaeum (Hook.) Benth. & Hook. f. ex Hemsl., 1881 |
| Hormidium tripterum (Brongn.) Cogn., 1898 |
| Hormidium uniflorum (Lindl.) Heynh., 1841 |
| Houlletia Brongn., 1841 |
| Houlletia tigrina Linden ex Lindl. & Paxton, 1853 |