Northern Vietnam, Lao Cai Prov., Van Ban Distr., Khanh Yen Ha municipality, in the vicinity of Na Nheo village (around point 22°00′18′'N, 104°17′59′'E). Old secondary broad-leaved evergreen lowland forest on granite and quartzite along river at elev. about 420 m a.s.l. Creeping vine 6-8 m lg on old trees in shady river canyon. Occasional.