S.Vietnam, Thua Thien Hue Prov., Phu Loc Distr., Bach Ma National Park, N slope of Bach Ma mt below Hai Vong Dai peak, around point 16°12′N 107°52′E at elev. 1100-900 m a.s.l.
Broad-leaved evergreen dry secondary mt forest on very steep shale/sandstone slopes. Creeping herb in open place. Flowers white with blue-violet base of tepals. Not rare.
HLF 1291 22 April 2003.
Coll. V.X.Phuong, L.Averyanov, N.X.Tam, N.T.Vinh. Grant from Henry Luce Foundation.