N. Vietnam, Ha Giang prov., Meo Vac distr., vicinities of Meo Vac town (N 23°10′ E 105°24′), 48.2 km to 36° of Ha Giang city. Remnants of primary open mossy wet mixed forests with Pseudotsuga brevifolia along tops of limestone karst remnant ridge at elev. 1200-1250 m a.s.l. Creeping lithophytic shrub on mossy open cliffs. Flowers yellowish-white with green tips of tepals. Not rare.
NTH 3431 07 Oct. 1999
Collectors: N.T. Hiep, N.Q. Binh, L. Averyanov, P. Cribb.