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. 250-300 m a.s.l. Lithophyte on shady cliffs. Not common.
NTH 3256 01 Oct. 1999
Collectors: N.T. Hiep, N.Q. Binh, L. Averyanov, P. Cribb.