| Pinarophyllon Brandegee, 1914 |
| Pinarophyllon bullatum Standl., 1921 |
| Pinarophyllon flavum Brandegee, 1914 |
| Pittoniotis Griseb., 1858 |
| Pittoniotis protracta (Bartl. ex DC.) Griseb., 1858 |
| Pittoniotis trichantha Griseb., 1858 |
| Placocarpa Hook. f., 1873 |
| Placocarpa mexicana Hook. f., 1873 |
| Plocaniophyllon Brandegee, 1914 |
| Plocaniophyllon flavum Brandegee, 1914 |
| Pogonopus Klotzsch, 1853 |
| Pogonopus exsertus (Oerst.) Oerst., 1863 |
| Pogonopus speciosus (Jacq.) K. Schum., 1889 |
| Portlandia P. Browne, 1756 |
| Portlandia ghiesbreghtiana Baill., 1879 |
| Portlandia guatemalensis Standl., 1928 |
| Portlandia lumaeana (Baill.) Baill., 1880 |
| Portlandia mexicana (Zucc. & Mart. ex DC.) Hemsl., 1879 |
| Portlandia pterosperma S. Watson, 1889 |
| Posoqueria Aubl., 1775 |