N. Vietnam, Ha Giang prov., Dong Van distr., Tu Tinh municipality (N 23°05′ E 105°15′), 40.7 km to 43° of Ha Giang city. Remnants of dry broadleaved evergreen forest on steep slopes and cliffs near the top of karst limestone isolated mesae at elev. 600-750 m a.s.l. Lithophyte forb up to 0.8 m hg on shady mossy rocks. Flowers pinl-violet. Very common.
NTH 3546 10 Oct. 1999
Collectors: N.T. Hiep, N.Q. Binh, L. Averyanov, P. Cribb.