Northern Vietnam, Lao Cai Prov., Van Ban Distr., Khanh Yen Ha municipality, elevation from Na Nheo village to the S from 680 to 880 m a.s.l. (around point 21°59′24′'N, 104°16′23′'E). Secondary submontane shrubs among agricultural areas on granite and quartzite near village on very steep slope. Woody vine or climbing shrub 2-3 m hg. Not rare at elev. 700 m a.s.l.