N. Vietnam, Ha Giang prov., Dong Van distr., Ta Phin municipality, vicinities of Sa Tung Chu village (N 23°11′ E 105°17′), 51.5 km to 38° of Ha Giang city. Remnants of primary mossy mixed and coniferous forest with Pseudotsuga brevifolia on tops of remnant limestone karst ridge at elev. 1300 m a.s.l. Lithophyte on steep mossy shady cliffs. Flowers bright red. Very commopn.
NTH 3365 06 Oct. 1999
Collectors: N.T. Hiep, N.Q. Binh, L. Averyanov, P. Cribb.