Houphan Prov., Viengxay Distr., Khang Pa Pong village, around point 20°19'41.4''N 104°25'10.6''E. Primary and secondary broad-leaved evergreen dry forest on very steep rocky slopes of highly eroded mountains composed by solid marble-like limestone at elev. 1000-1100 m a.s.l. Tree 10-12 m tall, 20 cm DBH on mountain slope and top. Common.