S.Vietnam, Thua Thien Hue Prov., Phu Loc Distr., Bach Ma National Park, S slope of Bach Ma mt below Hai Vong Dai peak, to SW of point 16°11′41′'N 107°51′26′'E at elev. 1100-1300 m a.s.l.
Mixed and broad-leaved evergreen secondary closed wet mt forest on very steep shale/granite slopes. Shrub up to 3 m tall in open place along stream canyon. Flowers white with violet tint. Common.
HLF 1376 27 April 2003.
Coll. N.T.Hiep, L.Averyanov, N.T.Vinh et al. Grant from Henry Luce Foundation.