| Poa occidentalis (Vasey) Vasey, 1893 |
| Poa oligeria Steud., 1854 |
| Poa orcuttiana Vasey, 1887 |
| Poa orizabensis Hitchc., 1913 |
| Poa oxylepis Torr., 1853 |
| Poa palmeri Soreng & P.M. Peterson, 2012 |
| Poa panicea Retz., 1783 |
| Poa panicoides (J. Presl) Kunth, 1833 |
| Poa parviflora Pursh, 1814 |
| Poa patula Kunth, 1815 |
| Poa peckii Chase, 1938 |
| Poa pectinacea Michx., 1803 |
| Poa pilosa L., 1753 |
| Poa pinegensis Roshev., 1931 |
| Poa plumosa Retz., 1786 |
| Poa polytricha (Nees) Kunth, 1833 |
| Poa pratensis L., 1753 |
| Poa pratensis subsp. agassizensis (B. Boivin & D. Löve) Roy L. Taylor & MacBryde, 1978 |
| Poa pratensis subsp. alpigena (Lindm.) Hiitonen, 1933 |
| Poa pratensis subsp. angustifolia (L.) Lej., 1828 |