ESSER, H.-J., and M. F. WATSON. “PHYSOSPERMOPSIS, A NEW GENUS OF UMBELLIFERAE (APIACEAE) FOR THAILAND, AND A NEW SPECIES”. Edinburgh Journal of Botany 63, no. 1 (August 4, 2006): 9–13. Accessed September 15, 2026. https://journals.rbge.org.uk/ejb/article/view/1279.