| Panicum longisetum Torr., 1822 |
| Panicum longum Hitchc. & Chase, 1910 |
| Panicum lucidum Ashe, 1898 |
| Panicum lucidum var. opacum Fernald, 1937 |
| Panicum lundellii Swallen, 1938 |
| Panicum lutescens Weigel, 1772 |
| Panicum lutescens var. flavum (Nees) Backer, 1927 |
| Panicum lutetens K. Schum., 1897 |
| Panicum luticola Hitchc., 1922 |
| Panicum macranthum Trin., 1826 |
| Panicum macrocarpon Torr., 1823 |
| Panicum macrospermum (Gould) Espejo & López-Ferr., 2000 |
| Panicum macrostachyum (Kunth) Nees, 1829 |
| Panicum macrostachyum var. patens Döll, 1877 |
| Panicum macrourum Trin., 1834 |
| Panicum maculatum Reichb. ex Schldl. & Cham., 1831 |
| Panicum maculatum var. pilosum E. Fourn., 1886 |
| Panicum malabaricum (L.) Merr., 1909 |
| Panicum malacon Nash, 1897 |
| Panicum malacophyllum (Trin.) Kuntze, 1898 |