| Prosopis odorata Torr. & Frém., 1845 |
| Prosopis palmeri S. Watson, 1889 |
| Prosopis pazensis (Britton & Rose) Wiggins, 1950 |
| Prosopis pubescens Benth., 1846 |
| Prosopis reptans Benth., 1841 |
| Prosopis reptans subsp. cinerascens (A. Gray) A.E. Murray, 1983 |
| Prosopis reptans var. cinerascens (A. Gray) Burkart, 1940 |
| Prosopis tamaulipana Burkart, 1976 |
| Prosopis velutina Wooton, 1898 |
| Prosopis yaquiana R.A. Palacios, 2006 |
| Pseudocassia Britton & Rose, 1930 |
| Pseudocassia anisopetala (Donn. Sm.) Britton & Rose, 1930 |
| Pseudocassia petensis Britton & Rose, 1930 |
| Pseudocassia spectabilis (DC.) Britton & Rose, 1930 |
| Pseudosamanea Harms, 1930 |
| Pseudosamanea guachapele (Kunth) Harms, 1930 |
| Pseudosophora (DC.) Sweet, 1830 |
| Pseudosophora sericea (Nutt.) Sweet, 1830 |
| Psoralea L., 1753 |
| Psoralea alopecuroides (Willd.) Poir., 1804 |