| Bromus pinetorum Swallen, 1943 |
| Bromus porteri (J.M. Coult.) Nash, 1895 |
| Bromus porteri var. frondosus Shear, 1900 |
| Bromus porteri var. havardii Shear, 1900 |
| Bromus porteri var. lanatipes Shear, 1900 |
| Bromus preslii Kunth, 1833 |
| Bromus proximus Shear, 1901 |
| Bromus proximus var. schlechtendalii (E. Fourn.) Shear, 1901 |
| Bromus pseudolaevipes Wagnon, 1950 |
| Bromus pubescens Muhl. ex Willd., 1809 |
| Bromus pubescens var. canadensis Eaton & J. Wright, 1848 |
| Bromus pubescens var. ciliatus Eaton & J. Wright, 1848 |
| Bromus purgans L., 1753 |
| Bromus purgans var. ciliatus (L.) Kuntze, 1891 |
| Bromus purgans var. longispicatus Hook., 1840 |
| Bromus purgans var. pallidus Hook., 1840 |
| Bromus richardsonii Link, 1833 |
| Bromus richardsonii var. pallidus (Hook.) Shear, 1900 |
| Bromus rigidus Roth, 1790 |
| Bromus rigidus subsp. gussonei (Parl.) Maire, 1934 |