| Perymenium rogmacvaughii Rzed. & Calderón, 2010 |
| Perymenium ruacophilum Donn. Sm., 1913 |
| Perymenium rude B.L. Rob. & Greenm., 1899 |
| Perymenium sedasanum J.J. Fay, 1978 |
| Perymenium sonoranum (B.L. Turner) B.L. Turner, 2007 |
| Perymenium sotoarenasii Rzed. & Calderón, 2010 |
| Perymenium stenophyllum S.F. Blake, 1919 |
| Perymenium strigillosum (B.L. Rob. & Greenm.) Greenm., 1912 |
| 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 |