| Painteria compacta (Rose) Britton & Rose, 1928 |
| Painteria elachistophylla (A. Gray ex S. Watson) Britton & Rose, 1928 |
| Painteria leptophylla (DC.) Britton & Rose, 1928 |
| Painteria revoluta (Rose) Britton & Rose, 1928 |
| Palmerocassia Britton, 1930 |
| Palmerocassia unijuga (Rose) Britton ex Britton & Rose, 1930 |
| Palmerocassia villosa Britton, 1930 |
| Palmerocassia wislizeni (A. Gray) Britton & Rose, 1930 |
| Papilionoideae DC., 1825 |
| Parkinsonia L., 1753 |
| Parkinsonia aculeata L., 1753 |
| Parkinsonia florida (Benth. ex A. Gray) S. Watson, 1876 |
| Parkinsonia microphylla Torr., 1857 |
| Parkinsonia praecox (Ruiz & Pav. ex Hook.) Hawkins, 1999 |
| Parkinsonia spinosa Kunth, 1823 |
| Parkinsonia texana (A. Gray) S. Watson, 1876 |
| Parkinsonia texana var. macra (I.M. Johnst.) Isely, 1975 |
| Parkinsonia texana var. texana (A. Gray) S. Watson, 1876 |
| Parkinsonia thornberi M.E. Jones, 1908 |
| Parkinsonia torreyana S. Watson, 1876 |