| Panicum ciliferum Nash, 1897 |
| Panicum ciliosum Nash, 1899 |
| Panicum cirrhosum (E. Fourn.) Scribn. & Merr., 1900 |
| Panicum clivum Sohns, 1956 |
| Panicum clutei Nash, 1899 |
| Panicum coenosum Döll, 1877 |
| Panicum colonum L., 1759 |
| Panicum colonum f. maculatum Arechav., 1894 |
| Panicum colonum var. humile Nees, 1843 |
| Panicum colonum var. zonale (Guss.) L.H. Dewey, 1894 |
| Panicum coloratum L., 1767 |
| Panicum coloratum Walter, 1788 |
| Panicum coloratum var. minus Stapf ex Chiov., 1916 |
| Panicum columbianum Scribn., 1897 |
| Panicum columbianum var. commonsianum (Ashe) Dore, 1976 |
| Panicum columbianum var. oricola (Hitchc. & Chase) Fernald, 1934 |
| Panicum columbianum var. siccanum (Hitchc. & Chase) B. Boivin, 1967 |
| Panicum columbianum var. thinium (Hitchc. & Chase) Hitchc. & Chase, 1908 |
| Panicum columbiense Kuntze, 1898 |
| Panicum commelinifolium Ashe, 1898 |