Ha Giang prov., Quan Ba distr., Tung Vai commune, Thung Pang village, around point 23°04ʹ38.6ʺN 104°56ʹ06.8ʺE, steep rocky slopes near hill top composed with stratified highly eroded limestone at elevation 1000–1100 m a.s.l. Remnants of primary evergreen broad-leaved very humid forest. Terrestrial erect herb to 1 m tall on open rocky mossy slope. Flowers pale yellow. Not rare. 17 October 2018, L. Averyanov, Nguyen Sinh Khang, T. Maisak, Truong Duc Thieu, VR 898 (HN, LE01049818).