N. Vietnam, Ha Giang prov., Meo Vac distr., vicinities of Meo Vac town (N23°10′ E105°24′), 48.2 km to 36° of Ha Giang city. Primary evergreen broadleaved wet closed forest on sandstones at elev. 1300 m a.s.l. Terrestrial forb up to 0.5 m hg. Flowers pale greenish. Locally common. NTH 3424 07 Oct. 1999 Collectors: N.T. Hiep, N.Q. Binh, L. Averyanov, P. Cribb.