Son La Prov., Moc Chau Distr., Chieng Son comm., Pha Luong village, Pha Luong Mountains. Primary evergreen broad-leaved and mixed forest with Pinus cernua on mountain tops and steep summit slopes composed with highly eroded red-brown sandstone at elevation 1400-1500 m a.s.l. around point 20°41’33.2N 104°37’37.0E. Terrestrial and lithophytic treelet 3-5 m tall in open mossy rocky place near mountain top. Common.