| Holcus sudanensis (Piper) L.H. Bailey, 1923 |
| Holcus trichocladus (Rupr. ex Hack.) Nash, 1912 |
| Holcus virginicus Muhl. ex Steud., 1840 |
| Holcus zizanioides (L.) Kuntze ex Stuck., 1904 |
| Homalachne (Benth. & Hook.) Kuntze, 1903 |
| Homalocenchrus Mieg., 1760 |
| Homalocenchrus angustifolius Kuntze, 1891 |
| Homalocenchrus gouinii (E. Fourn.) Kuntze, 1891 |
| Homalocenchrus hexandrus (Sw.) Kuntze, 1891 |
| Homalocenchrus ligularis (Trin.) Kuntze, 1891 |
| Homalocenchrus monandrus (Sw.) Kuntze, 1891 |
| Homalocenchrus oryzoides (L.) Haller, 1768 |
| Homoeatherum Nees ex Lindl., 1836 |
| Homoiachne Pilg., 1949 |
| Homolepis Chase, 1911 |
| Homolepis aturensis (Kunth) Chase, 1911 |
| Homolepis glutinosa (Sw.) Zuloaga & Soderstr., 1985 |
| Homolepis isocalycia (G. Mey.) Chase, 1911 |
| Homopogon Stapf, 1908 |
| Hopia Zuloaga & Morrone, 2007 |