S.Vietnam, Quang Tri Prov., Dak Krong Distr., Dak Krong Municipality, Ko Po willage at elev. 50 m a.s.l., around point 16°38′21′'N, 106°48′00′'E.
Open secondary evergreen forest and shrubs on rocky slopes of Rao Quan river valley. Tree 5-10 m tall. Flowers light violet to white with pink-violet tint. Common.