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. Living plants.