Son La Prov., Van Ho Distr., Tan Xuan Municipality, Cot Moc village, territory of Xuan Nha natural reserve, eastern slopes of Pha Luong Mountain. Remnants of primary and secondary broad-leaved evergreen humid forest on very steep mountain slopes composed by shale and sandstone at elevation about 1000 m a.s.l. around point 20°40’33.3’’N 104°39’00.3’’E. Terrestrial herb on steep slope along narrow shady rocky stream canyon. Occasional. 15 November 2013 CPC 7158a & CPC 7158b Coll.: L.Averyanov, N.T.Hiep, N.S.Khang, N.D.Thang, L.D.Qui
Fl. cult 10 September – 10 November 2015. Flowers dirty purple-brownish, Stigma pure white, Anthers yellow. Photos. L. Averyanov