| Panicum patulum (Scribn. & Merr.) Hitchc., 1906 |
| Panicum pauciciliatum Ashe, 1899 |
| Panicum pauciflorum Elliott, 1816 |
| Panicum paucifolium Swallen, 1950 |
| Panicum pedicellatum Vasey, 1889 |
| Panicum pedunculare Willd. ex Steud., 1853 |
| Panicum pedunculatum Torr., 1823 |
| Panicum penicillatum Willd. ex Nees, 1829 |
| Panicum pennisetum Roth, 1821 |
| Panicum perdensum Steud., 1853 |
| Panicum pernervosum Nash, 1899 |
| Panicum petiolatum Nees, 1829 |
| Panicum petrosum Trin., 1829 |
| Panicum phleiforme J. Presl, 1830 |
| Panicum pictigluma Steud., 1853 |
| Panicum pilatum Swallen, 1951 |
| Panicum pilcomayense Hack., 1907 |
| Panicum pilisparsum G. Mey., 1818 |
| Panicum pilosissimum Roth ex Roem. & Schult., 1817 |
| Panicum pilosum Sw., 1788 |