Northern Vietnam, Lao Cai Prov., Van Ban Distr., Khanh Yen Ha municipality, to the SW of Na Nheo village (in the vicinity of point 21°58′12′'N, 104°14′02′'E). Secondary evergreen broad-leaved montane forest with bamboo on steep granite and quartzite slopes at elev. 1600-1700 m a.s.l. Woody vine up to 20 m lg. Very common.