N. Vietnam, Lang Son prov., Huu Lung distr., Huu Lien municipality (N 21°40′ E 106°22′). Primary evergreen broadleaved wet forest on steep slopes of remnant karst limestone ridge at elev. 400-450 m a.s.l. Lithophytic forb on vertical shady cliff. Flowers violet, leaves green, pink below. Very common.
NTH 3261 01 Oct. 1999
Collectors: N.T. Hiep, N.Q. Binh, L. Averyanov, P. Cribb.