| Perymenium subcordatum S.F. Blake, 1924 |
| Perymenium subsquarrosum B.L. Rob. & Greenm., 1899 |
| Perymenium tamaulipense B.L. Turner, 1987 |
| Perymenium tehuacanum Villaseñor & Panero, 1993 |
| Perymenium tenellum A. Gray, 1879 |
| Perymenium tuerckheimii Klatt, 1884 |
| Perymenium uxoris McVaugh, 1972 |
| Perymenium vandevenderorum B.L. Turner, 2017 |
| Perymenium verbesinoides DC., 1836 |
| Perymenium wilburorum McVaugh, 1972 |
| Perymenium yanezii B.L. Turner, 1992 |
| Petasites Mill., 1754 |
| Petasites japonicus (Siebold & Zucc.) Maxim., 1866 |
| Peteravenia R.M. King & H. Rob., 1971 |
| Peteravenia malvifolia (DC.) R.M. King & H. Rob., 1971 |
| Peteravenia phoenicolepis (B.L. Rob.) R.M. King & H. Rob., 1971 |
| Peteravenia rhodochlamydea (A. Gray) R.M. King & H. Rob., 1971 |
| Peteravenia schultzii (Schnittsp.) R.M. King & H. Rob., 1971 |
| Peucephyllum A. Gray, 1859 |
| Peucephyllum schottii A. Gray, 1859 |