| Hordeum patulum Moench, 1794 |
| Hordeum polystichon Haller f., 1776 |
| Hordeum polystichon var. vulgare (L.) Döll, 1843 |
| Hordeum pusillum Nutt., 1818 |
| Hordeum sativum Pers., 1805 |
| Hordeum sativum var. vulgare (L.) K. Richt., 1890 |
| Hordeum spontaneum K. Koch, 1848 |
| Hordeum stebbinsii Covas, 1949 |
| Hordeum tetrastichum Stokes, 1812 |
| Hordeum utriculatum Bertero, 1829 |
| Hordeum vulgare L., 1753 |
| Hordeum vulgare subsp. agriocrithon (Åberg) Á. Löve, 1984 |
| Hordeum vulgare subsp. deficiens (Steud. ex A. Braun) Á. Löve, 1984 |
| Hordeum vulgare subsp. distichum (L.) Thell., 1912 |
| Hordeum vulgare subsp. hexastichon (L.) Celak., 1867 |
| Hordeum vulgare subsp. spontaneum (K. Koch) Asch. & Graebn., 1900 |
| Hordeum x caespitosum Scribn., 1899 |
| Hordeum zeocriton L., 1753 |
| Hydrochloa Hartm., 1819 |
| Hydropoa (Dumort.) Dumort., 1868 |