| Panicum webberianum Nash, 1896 |
| Panicum wilmingtonense Ashe, 1900 |
| Panicum wrightianum Scribn., 1898 |
| Panicum x shastense Scribn. & Merr., 1970 |
| Panicum xalapense Kunth, 1815 |
| Panicum xalapense subsp. strictirameum Hitchc. & Chase, 1910 |
| Panicum xanthospermum Scribn. & C. Mohr, 1910 |
| Panicum zelayense (Kunth) Steud., 1841 |
| Panicum zizanioides Kunth, 1816 |
| Panicum zizanioides var. microphyllum Döll, 1877 |
| Panicum zonale Guss., 1827 |
| Papoforeas É. Desv., 1854 |
| Pappophoreae Kunth, 1829 |
| Pappophorinae Dumort., 1829 |
| Pappophorum Schreb., 1791 |
| Pappophorum alopecuroideum Vahl, 1794 |
| Pappophorum apertum Munro ex Scribn., 1882 |
| Pappophorum apertum var. vaginatum (Buckley) Scribn. ex L.H. Dewey, 1894 |
| Pappophorum bicolor E. Fourn. ex Hemsl., 1885 |
| Pappophorum bicolor E. Fourn., 1886 |