| Name | Physospermopsis siamensis Esser & M. F. Watson |
| Authorship | Esser & M. F. Watson |
| Rank | Species |
| Placed in | Physospermopsis |
| Citation | 2006 Edinburgh J. Bot. 63(1): 10 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Physospermopsis siamensis Esser & M. F. Watson |
| Identification made in | 2022 (2) |