| Psoralidium Rydb., 1919 |
| Psoralidium tenuiflorum (Pursh) Rydb., 1919 |
| Psorothamnus Rydb., 1919 |
| Psorothamnus arborescens (Torr. ex A. Gray) Barneby, 1977 |
| Psorothamnus arborescens var. arborescens (Torr. ex A. Gray) Barneby, 1977 |
| Psorothamnus dentatus Rydb., 1919 |
| Psorothamnus emoryi (A. Gray) Rydb., 1919 |
| Psorothamnus emoryi var. arenarius (Brandegee) Barneby, 1977 |
| Psorothamnus emoryi var. emoryi (A. Gray) Rydb., 1919 |
| Psorothamnus schottii (Torr.) Barneby, 1977 |
| Psorothamnus scoparius (A. Gray) Rydb., 1919 |
| Psorothamnus spinosus (A. Gray) Barneby, 1977 |
| Pterocarpus Jacq., 1763 |
| Pterocarpus acapulcensis Rose, 1897 |
| Pterocarpus amphymenium DC., 1825 |
| Pterocarpus ateleia DC., 1825 |
| Pterocarpus ecastaphyllum L., 1774 |
| Pterocarpus gummifer Bertero ex DC., 1825 |
| Pterocarpus hayesii Hemsl., 1878 |
| Pterocarpus mexicanus Sessé & Moc., 1894 |