| Homolepis glutinosa (Sw.) Zuloaga & Soderstr., 1985 |
| Homolepis isocalycia (G. Mey.) Chase, 1911 |
| Homopogon Stapf, 1908 |
| Hopia Zuloaga & Morrone, 2007 |
| Hopia obtusa (Kunth) Zuloaga & Morrone, 2007 |
| Hoplismenus Hassk., 1844 |
| Hordeiformae J.G. Sm., 1899 |
| Hordeinae Dumort., 1829 |
| Hordeum L., 1753 |
| Hordeum (Zeocriton) (Wolf) Hack., 1887 |
| Hordeum adscendens Kunth, 1816 |
| Hordeum arizonicum Covas, 1949 |
| Hordeum avenaceum Wiggins ex P. Beauv., 1812 |
| Hordeum berteroanum É. Desv., 1854 |
| Hordeum berteroanum var. pumila É. Desv., 1854 |
| Hordeum boreale Scribn. & J.G. Sm., 1897 |
| Hordeum brachyantherum Nevski, 1936 |
| Hordeum caespitosum Scribn. ex Pammel, 1899 |
| Hordeum canadense (L.) Asch. & Graebn., 1902 |
| Hordeum depressum (Scribn. & J.G. Sm.) Rydb., 1909 |