Cao Bang Prov., Thong Nong Distr., Yen Son Municipality, Nhieu Lung village, around point 22°46'07.9"N, 105°53'59.4"E.
Primary fractionaly logged coniferous forest with Pseudotsuga sinensis along highly eroded rocky limestone ridge at elevation 1150-1250 m a.s.l. Terrestrial and lithophytic herb to 0.5 m tall in shady humid place in rocky valley. Flowers violet. Occasional.