| Perezia vernonioides A. Gray, 1887 |
| Perezia wislizeni A. Gray, 1849 |
| Perezia wislizeni var. megacephala A. Gray, 1887 |
| Perezia wrightii A. Gray, 1852 |
| Perezia wrightii var. arizonica M.E. Jones, 1933 |
| Pereziopsis J.M. Coult., 1895 |
| Pereziopsis donnell-smithii J.M. Coult., 1895 |
| Pericalia Cass., 1827 |
| Pericalia michoacana (B.L. Rob.) Rydb., 1924 |
| Pericalia ovatifolia (Sch. Bip.) Rydb., 1924 |
| Pericalia sessilifolia (Hook. & Arn.) Rydb., 1924 |
| Pericome A. Gray, 1853 |
| Pericome caudata A. Gray, 1853 |
| Pericome macrocephala B.L. Rob., 1907 |
| Perityle Benth., 1844 |
| Perityle aglossa A. Gray, 1853 |
| Perityle aurea Rose, 1890 |
| Perityle batopilensis A.M. Powell, 1983 |
| Perityle bisetosa (Torr. ex A. Gray) Shinners, 1959 |
| Perityle bisetosa var. appressa A.M. Powell, 1967 |