N. Vietnam, Ha Giang prov., Quan Ba distr., Can Ti municipality, vicinities of Sing Xuoi Ho village (N 23°04′ E 104°59′), 26.2 km to 002° of Ha Giang city. Primary closed evergreen mixed wet mossy forest (with Cupressus, Taxus, Nagea and Pseoudotsuga) along tops of karst remnant limestone ridge at elev. 1100-1150 m a.s.l. Epiphytic shrublet up to 0.5 m hg. Flowers white. Not common.
NTH 3620 12 Oct. 1999
Collectors: N.T. Hiep, N.Q. Binh, L. Averyanov, P. Cribb.