Cao Bang prov., Thong Nong distr., Yen Son municipality, Ngan Vai village, 22°46'53"N, 105°52'58.7"E, primary coniferous forest with Pseudotsuga sinensis along highly eroded rocky limestone ridge, 1300 m terrestrial and lithophytic herb 0.5 m tall in shady place on middle part of slope, common, 7 October 2013, L.Averyanov et al., CPC 5443.
Herbarium prepared in 15.05.2019, L. Averyanov, CPC 5443.1. Flowers pure white, odorless.