| Panicum barbinode Trin., 1832 |
| Panicum barbipulvinatum Nash, 1900 |
| Panicum barbipulvinatum var. hirsutipes Suksd., 1927 |
| Panicum barbulatum Michx., 1803 |
| Panicum bartlettii Swallen, 1934 |
| Panicum beckmanniiforme J.C. Mikan ex Trin., 1821 |
| Panicum benneri Fernald, 1944 |
| Panicum bennettense W.V. Br., 1942 |
| Panicum berchtholdiae Döll, 1877 |
| Panicum bergii Arechav., 1894 |
| Panicum bermudianum Steud., 1841 |
| Panicum bernoullianum Mez, 1921 |
| Panicum berteronianum (Schult.) Steud., 1854 |
| Panicum beyrichii Kunth, 1830 |
| Panicum bidentatum Steud., 1853 |
| Panicum bidentulum Steud., 1855 |
| Panicum biforme (Willd.) Kunth, 1829 |
| Panicum biglandulare Scribn. & J.G. Sm., 1897 |
| Panicum bipustulatum Schltdl., 1854 |
| Panicum bistipulatum Schltdl. ex Steud., 1855 |