Northern Vietnam, Lao Cai Prov., Van Ban Distr., Khanh Yen Ha municipality, in the vicinity of Na Nheo village (around point 21°59′24′'N, 104°16′23′'E). Open secondary submontane shrubs on very steep granite and quartzite mountain river slopes at elev. about 680 m a.s.l. Woody vine 4-6 m lg. Flowers white, yellowish when old. Rare.