| Panicum grisebachianum Mez, 1921 |
| Panicum grisebachii Nash, 1908 |
| Panicum grossarium L., 1759 |
| Panicum grossum Salisb., 1796 |
| Panicum guadaloupense Spreng. ex Steud., 1853 |
| Panicum guaraniticum Speg., 1883 |
| Panicum guatemalense Swallen, 1933 |
| Panicum guayaquilense Steud., 1854 |
| Panicum guianense Hitchc., 1922 |
| Panicum haemacarpon Ashe, 1898 |
| Panicum haenkeanum J. Presl, 1830 |
| Panicum hallii Vasey, 1884 |
| Panicum hallii subsp. filipes (Scribn.) Freckmann & Lelong, 2002 |
| Panicum hallii var. filipes (Scribn.) F.R. Waller, 1974 |
| Panicum hallii var. hallii Vasey, 1884 |
| Panicum halophilum Nash, 1901 |
| Panicum hamiltonii Kunth, 1833 |
| Panicum havardii Vasey, 1887 |
| Panicum helleri Nash, 1899 |
| Panicum hemignostum Steud., 1853 |