| Parosela warnockii Tharp & F.A. Barkley, 1946 |
| Parosela watsoni Rose, 1906 |
| Parosela whitehousae Tharp & F.A. Barkley, 1946 |
| Parosela wislizeni (A. Gray) Vail, 1894 |
| Parosela wislizeni var. sanctae-crucis (Rydb.) J.F. Macbr., 1922 |
| Parosela wislizeni var. sessilis (A. Gray) Vail, 1897 |
| Parosela wrightii (A. Gray) Vail, 1897 |
| Parosela zimapanica (Schauer) Rydb., 1920 |
| Patrinia Juss., 1807 |
| Patrinia sericea (Nutt.) Raf., 1819 |
| Paubrasilia Gagnon, H.C. Lima & G.P. Lewis, 2016 |
| Paubrasilia echinata (Lam.) Gagnon, H.C. Lima & G.P. Lewis, 2016 |
| Pauletia Cav., 1799 |
| Pauletia aculeata Cav., 1799 |
| Pauletia inermis Cav., 1799 |
| Pauletia ungulata (L.) A. Schmitz, 1973 |
| Pediomelum Rydb., 1919 |
| Pediomelum californicum (S. Watson) Rydb., 1919 |
| Pediomelum castoreum (S. Watson) Rydb., 1919 |
| Pediomelum cuspidatum (Pursh) Rydb., 1919 |