| Hilaria swallenii Cory, 1948 |
| Hilaria texana (Vasey) Nash, 1903 |
| Hilariinae P.M. Peterson & Columbus, 2007 |
| Hildaea C. Silva & R.P. Oliveira, 2015 |
| Hildaea nemorosa (Sw.) C. Silva & R.P. Oliveira, 2015 |
| Hildaea pallens (Sw.) C. Silva & R.P. Oliveira, 2015 |
| Hildaea pallens var. major (Nees) C. Silva & R.P. Oliveira, 2015 |
| Hildaea pallens var. pallens (Sw.) C. Silva & R.P. Oliveira, 2015 |
| Hildaea tenuis (J. Presl) C. Silva & R.P. Oliveira, 2015 |
| Hippagrostis Kuntze, 1891 |
| Hippagrostis composita (L.) Kuntze, 1891 |
| Hippagrostis loliacea (Lam.) Kuntze, 1891 |
| Hippagrostis setaria (Lam.) Kuntze, 1891 |
| Hippagrostis undulatifolia Kuntze, 1891 |
| Holcinae Dumort., 1868 |
| Holcus L., 1753 |
| Holcus avenaceus Scop., 1772 |
| Holcus bicolor L., 1771 |
| Holcus bulbosus (Willd.) Schrad., 1806 |
| Holcus caffrorum Thunb., 1794 |