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. Secondary shrubs among limestone mossy rocks on very steep slope of karst remnant limestone ridge at elev. 400-600 m a.s.l. Terrestrial forb or shrublet up to 1 m hg in open place. Flowers light violet. Common.
NTH 3628 12 Oct. 1999
Collectors: N.T. Hiep, N.Q. Binh, L. Averyanov, P. Cribb.