Cao Bang Prov., Nguyen Binh Distr., Yen Lac Municipality, Chi Doi village, around point 22°45'34"N, 105°51'48.7"E.
Primary fractionaly logged coniferous forest with Pseudotsuga sinensis along highly eroded rocky limestone ridge at elevation about 1400 m a.s.l. Lithophytic herb to 0.5 m tall on wet open rocks in mountain walley. Flowers white, yellow-brownish inside. Locally common.