| Hordeum x caespitosum Scribn., 1899 |
| Hordeum zeocriton L., 1753 |
| Hydrochloa Hartm., 1819 |
| Hydropoa (Dumort.) Dumort., 1868 |
| Hydropoa Dumort., 1824 |
| Hydropoa nervata (Willd.) Dumort., 1868 |
| Hymenachne P. Beauv., 1812 |
| Hymenachne acutigluma (Steud.) Gilliland, 1964 |
| Hymenachne amplexicaulis (Rudge) Nees, 1829 |
| Hymenachne donacifolia (Raddi) Chase, 1923 |
| Hymenachne frondescens (G. Mey.) E. Fourn., 1886 |
| Hymenachne gouinii E. Fourn., 1886 |
| Hymenachne leptostachya (J. Presl) E. Fourn., 1886 |
| Hymenachne monostachya (Poir.) P. Beauv., 1812 |
| Hymenachne myosurus (Rich.) Nees, 1829 |
| Hymenachne myuros (Lam.) P. Beauv., 1812 |
| Hymenachne phleiforme (J. Presl) E. Fourn., 1886 |
| Hymenachne striata (Lam.) Griseb., 1864 |
| Hymenothecium Lag., 1816 |
| Hymenothecium quinquesetum Lag., 1816 |