A genus of 3 species, native to tropical and subtropical Asia. The most recent monographers of Sapium and related genera (Kruijt 1996; Esser 2002) place our naturalized species in the genus Triadica, native to Asia; Sapium (excluding Triadica) is a genus of 21 species restricted to the neotropics. This conclusion is corroborated by molecular phylogenetic analysis (Wurdack, Hoffmann, & Chase 2005).
ID notes:With Euphorbia and Cnidoscolus, one of our few Euphorbiaceous genera with milky sap.
Ref: Buthod, Hoagland, & Arbour (2019); DeBerry & Hunter (2018); Esser (2002); Govaerts, Frodin, & Radcliffe-Smith (2000); Kruijt (1996); Vogt et al. (2021); Webster (2014) In Kubitzki (2014); Wurdack (2016a) In Flora of North America Editorial Committee (2016); Wurdack, Hoffmann, & Chase (2005). Show full citations.