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. Secondary shrubs on alluvial foothills of limestone karst ridge along road at elev. 20-40 m a.s.l. Climbing shrub up to 2 m hg. Fruits orange. Not rare.