Vietnam, Ha Giang Prov., Hoang Su Phi Distr., Ho Thau Municipality, around Chien Thang village, about 4 km to NW of Ho Thau village (22°37′24″N, 104°38′00″E) at elev. 1200-1300 m a.s.l.
Remnants of heavily logged primary and secondary closed evergreen broad-leaved forest on very steep slopes of mountains composed with shale and granite with quartzite.
Terrestrial herb up to 2 m tall on open secondary short tall grasslands along road. Locally very common. Flowers white.