Nghe An Prov., Ky Son Distr., Na Ngoi Municipality, vicinities of Phu Kha village, eastern slopes of Phu Xai Lai Leng mountain system.
Secondary broad-leaved open forest and secondary scrub on very steep clay laterite hill slopes on shale along road at elevation 700-900 m a.s.l. around point 19°13′21.9″N 104°15′04.0″E.
Terrestrial herb 1.5-2.5 m tall in open wet place along rocky stream slope. Flowers pale yellow, very fragrant. Occasional.
27 October 2013 CPC 6373 Coll.: L.Averyanov, N.T.Hiep, N.S.Khang, L.M.Tuan