| Pollalesta peruviana Aristeg., 1963 |
| Polyactidium DC., 1836 |
| Polyactidium seemannii Sch. Bip., 1856 |
| Polyactis Less., 1832 |
| Polyactis delphiniifolia Less., 1832 |
| Polymnia L., 1753 |
| Polymnia aspera (Mart.) DC., 1836 |
| Polymnia grandis Hort. Berol. ex Kunth, 1847 |
| Polymnia liebmannii Sch. Bip., 1887 |
| Polymnia maculata Cav., 1795 |
| Polymnia mcvaughii J.R. Wells, 1967 |
| Polymnia nervata M.E. Jones, 1908 |
| Polymnia oaxacana Sch. Bip. ex Klatt, 1887 |
| Polymnia scabra Zucc., 1832 |
| Polymnieae (H. Rob.) Panero, 2002 |
| Polypappus Nutt., 1848 |
| Polypappus sericeus Nutt., 1848 |
| Porophyllum Guett., 1754 |
| Porophyllum amplexicaule A. Gray, 1852 |
| Porophyllum brachypodum B.L. Rob., 1900 |