Son La Prov., Van Ho Distr., Chieng Xuan Municipality, Co Hong village, territory of Xuan Nha natural reserve, Pha Luong Mountain. Primary coniferous and mixed forest with Pinus cernua on very steep slopes along ridge edge composed by brown sandstone at elevation 1200-1400 m a.s.l. around point 20°41’40.5’’N 104°39’24.7’’E. Terrestrial herb on very steep open mossy slope near mountain top. Flowers: tepals olive greenish with brownish stripes, lip white with purple-brown marks. Not common.