| Festuca x miscella Darbysh., 2007 |
| Festucaria Heist. ex Fabr., 1759 |
| Fibichia Koeler, 1802 |
| Fibichia dactylon (L.) Beck, 1904 |
| Fibichia umbellata Koeler, 1802 |
| Fiorinia Parl., 1850 |
| Flavia Heist. ex Fabr., 1759 |
| Foenodorum Krause, 1911 |
| Forasaccus Bubani, 1901 |
| Forasaccus breviaristatus (Hook.) Lunell, 1915 |
| Forasaccus ciliatus (L.) Lunell, 1915 |
| Forasaccus inermis (Leyss.) Lunell, 1915 |
| Forasaccus marginatus (Nees ex Steud.) Lunell, 1915 |
| Forasaccus maximus (Desf.) Bubani, 1901 |
| Forasaccus mollis (L.) Bubani, 1901 |
| Fourniera Scribn., 1897 |
| Fourniera mexicana Scribn., 1897 |
| Frumentum E.H.L. Krause, 1898 |
| Fussia Schur, 1866 |
| Fussia caryophyllea (L.) Schur, 1866 |