| Muhlenbergia subalpina Vasey, 1885 |
| Muhlenbergia subaristata Swallen, 1936 |
| Muhlenbergia subbiflora Hitchc., 1935 |
| Muhlenbergia subtilis Nees, 1847 |
| Muhlenbergia sylvatica Torr., 1834 |
| Muhlenbergia sylvatica var. flexuosa Vasey, 1879 |
| Muhlenbergia sylvatica var. pringlei Scribn., 1882 |
| Muhlenbergia sylvatica var. setarioides (E. Fourn.) Beal, 1896 |
| Muhlenbergia tarahumara P.M. Peterson & Columbus, 2009 |
| Muhlenbergia tenella (Kunth) Trin., 1824 |
| Muhlenbergia tenuifolia (Kunth) Kunth, 1829 |
| Muhlenbergia tenuifolia (Kunth) Trin., 1824 |
| Muhlenbergia tenuissima (J. Presl) Kunth, 1833 |
| Muhlenbergia texana Buckley, 1862 |
| Muhlenbergia texana Thurb. ex Porter & J.M. Coult., 1874 |
| Muhlenbergia thurberi (Scribn.) Rydb., 1905 |
| Muhlenbergia torreyi (Kunth) Hitchc. ex Bush, 1919 |
| Muhlenbergia trichodes Steud., 1854 |
| Muhlenbergia tricholepis (Torr.) Columbus, 2010 |
| Muhlenbergia trichopodes (Elliott) Chapm., 1860 |