N. Vietnam, Thai Nguyen prov., Vo Nhai distr., Than Sa municipality, vicinities of Kim Son village (N 21°48′ E 105°54′), 23.3 km to 18° of Thai Nguyen city. Primary open broadleaved evergreen valley forest along stream at elev. 20-40 m a.s.l. Tree up to 20 m hg. Codominanthe or occasional monodominanthe of the forest.