| Perlaria Heist. ex Fabr., 1763 |
| Perulifera A. Camus, 1928 |
| Peyritschia E. Fourn., 1886 |
| Peyritschia bealii P.M. Peterson, Soreng, Romasch. & Barberá, 2019 |
| Peyritschia deyeuxioides (Kunth) Finot, 2003 |
| Peyritschia humilis (Louis-Marie) Finot, 2003 |
| Peyritschia koelerioides (Peyr.) E. Fourn., 1886 |
| Peyritschia pinetorum (Swallen) Finot & P.M. Peterson, 2006 |
| Peyritschia pringlei (Scribn.) S.D. Koch, 1979 |
| Peyritschia tolucensis (Kunth) P.M. Peterson, Soreng, Romasch. & Barberá, 2019 |
| Peyritschia viridis (Kunth) P.M. Peterson, Soreng, Romasch. & Barberá, 2019 |
| Peyritschia virletii (E. Fourn.) P.M. Peterson, Soreng, Romasch. & Barberá, 2019 |
| Phacellaria Willd. ex Steud., 1841 |
| Phacellaria panicea Willd. ex Steud., 1841 |
| Phaenospermateae Renvoize & Clayton, 1985 |
| Phalarella Boiss., 1844 |
| Phalaridantha St.-Lag., 1889 |
| Phalaridinae Rchb., 1828 |
| Phalaridium Nees & Meyen, 1841 |
| Phalaris L., 1753 |