| Bouteloua porphyrantha C. Wright, 1871 |
| Bouteloua pringlei Scribn., 1901 |
| Bouteloua procumbens (P. Durand) Griffiths, 1912 |
| Bouteloua prostrata hort. ex Lag., 1805 |
| Bouteloua pubescens Pilg., 1909 |
| Bouteloua pumila Buckley, 1862 |
| Bouteloua purpurea Gould & Kapadia, 1964 |
| Bouteloua pusilla Vasey, 1884 |
| Bouteloua quiriegoensis Beetle, 1986 |
| Bouteloua racemosa Lag., 1805 |
| Bouteloua racemosa var. aristosa (A. Gray) S. Watson & J.M. Coult., 1890 |
| Bouteloua radicosa (E. Fourn.) Griffiths, 1912 |
| Bouteloua rahmeri Phil., 1891 |
| Bouteloua ramosa Scribn. ex Vasey, 1890 |
| Bouteloua reederorum Columbus, 1999 |
| Bouteloua reflexa Swallen, 1939 |
| Bouteloua repens (Kunth) Scribn. & Merr., 1901 |
| Bouteloua rigidiseta (Steud.) Hitchc., 1933 |
| Bouteloua rigidiseta var. chihuahuana M.C. Johnst., 1982 |
| Bouteloua rothrockii Vasey, 1893 |