Son La Prov., Moc Chau Distr., Chieng Son comm., Hin Pen village, around point 20°42’36.7N 104°35’11.0E. Primary and secondary evergreen broad-leaved forest on very steep slopes and cliffs of highly eroded red-brown sandstone at elevation about 1200 m a.s.l. Terrestrial stem-less herb on shady rocky slope near mountain top. Flowers white, pedicels light violet. Common.