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 along rocky Rao Quan river valley. Shrub 1-1.5 m tall on open wet place among large river rocks. Flowers yellowish-white, sometimes with purple tint. Very common.