Son La Prov., Moc Chau Distr., Chieng Son comm., Pha Luong village, Pha Luong Mountains.
Primary and secondary evergreen broad-leaved forest on very steep slopes and cliffs of highly eroded red-brown sandstone at elevation 1000-1050 m a.s.l. around point 20°42′02.1N 104°37′23.1E.
Shrub or treelet to 4 m tall in shady place. Flowers white. Stem cut with very strong unpleasant smell. Not common.