| Muhlenbergia wrightii Vasey ex J.M. Coult., 1885 |
| Muhlenbergia wrightii var. annulata Vasey, 1885 |
| Muhlenbergia xanthodas Soderstr., 1967 |
| Muhlenbergia xerophila C.O. Goodd., 1940 |
| Muhlenbergiinae Pilg., 1956 |
| Munroa Torr., 1857 |
| Munroa pulchella (Kunth) Amarilla, 2013 |
| Munroa squarrosa (Nutt.) Torr., 1857 |
| Munroa squarrosa var. floccuosa Vasey ex Beal, 1896 |
| Munroinae Parodi, 1946 |
| Mygalurus Link, 1821 |
| Nabelekia Roshev., 1937 |
| Narduretia Villar, 1925 |
| Nardurus (Bluff, Nees & Schauer) Rchb., 1841 |
| Nardurus (Bluff, Nees & Schauer) Stace, 1978 |
| Narenga Bor, 1940 |
| Nassella (Trin.) É. Desv., 1854 |
| Nassella caespitosa Griseb., 1874 |
| Nassella cernua (Stebbins & Love) Barkworth, 1990 |
| Nassella lepida (Hitchc.) Barkworth, 1990 |