| Bouteloua pendula hort. ex Lag., 1805 |
| Bouteloua pilosa (Hook. f.) Benth. ex S. Watson, 1883 |
| Bouteloua piurensis Pilg., 1921 |
| Bouteloua polymorpha (E. Fourn.) Columbus, 1999 |
| Bouteloua polystachya (Benth.) Torr., 1857 |
| Bouteloua polystachya var. major Vasey, 1878 |
| Bouteloua polystachya var. vestita S. Watson, 1883 |
| 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 |