| Muhlenbergia mundula I.M. Johnst., 1943 |
| Muhlenbergia mutica (Rupr. ex E. Fourn.) Hitchc., 1935 |
| Muhlenbergia nana Benth., 1846 |
| Muhlenbergia nardifolia Griseb., 1879 |
| Muhlenbergia nebulosa Scribn. ex Beal, 1896 |
| Muhlenbergia neomexicana Vasey, 1886 |
| Muhlenbergia nigra Hitchc., 1937 |
| Muhlenbergia orophila Swallen, 1950 |
| Muhlenbergia palmeri Vasey, 1886 |
| Muhlenbergia palustris Scribn., 1898 |
| Muhlenbergia paniculata (Nutt.) Columbus, 2010 |
| Muhlenbergia parviglumis Vasey, 1892 |
| Muhlenbergia pauciflora Buckley, 1862 |
| Muhlenbergia pectinata C.O. Goodd., 1941 |
| Muhlenbergia pereilema P.M. Peterson, 2009 |
| Muhlenbergia peruviana (P. Beauv.) Steud., 1840 |
| Muhlenbergia peruviana f. peruviana (P. Beauv.) Steud., 1840 |
| Muhlenbergia peruviana f. versicolor Kuntze, 1898 |
| Muhlenbergia peruviana f. viridis Kuntze, 1898 |
| Muhlenbergia peruviana var. breviaristata Hack. ex Buchtien, 1920 |