| Panicum tsugetorum Nash, 1898 |
| Panicum tuerckheimii Hack., 1906 |
| Panicum tumescens Trin., 1834 |
| Panicum umbonulatum Swallen, 1950 |
| Panicum umbraticola Kunth, 1829 |
| Panicum umbrosum Leconte ex Torr., 1818 |
| Panicum uncinatum Raddi, 1823 |
| Panicum unisetum (J. Presl) Trin., 1834 |
| Panicum unispicatum Scribn. & Merr., 1901 |
| Panicum urochloa Desv., 1831 |
| Panicum urvilleanum Kunth, 1831 |
| Panicum urvilleanum f. subpilosum Kuntze, 1898 |
| Panicum urvilleanum var. longiglume Scribn., 1901 |
| Panicum urvilleanum var. versicolor Kuntze, 1898 |
| Panicum vaginatum (Sw.) Gren. & Godr., 1856 |
| Panicum valenzuelanum A. Rich., 1850 |
| Panicum variifolium Swallen, 1934 |
| Panicum vaseyanum Scribn. ex Beal, 1896 |
| Panicum velutinosum Nees, 1826 |
| Panicum venosum Swallen, 1950 |