S.Vietnam, Thua Thien Hue Prov., Phu Loc Distr., Bach Ma National Park, SW slope of Bach Ma mt system around point 16°11′22′'N 107°50′48′'E at elev. 750-850 m a.s.l.
Broad-leaved evergreen primary closed forest along very steep rocky slopes and bluffs of high waterfall faced to the S. Creeping terrestrial and lithophytic herb in open wet place along river. Flowers purple-violet. Not common.
HLF 1620 4 May 2003.
Coll. N.T.Hiep, L.Averyanov, N.T.Vinh et al. Grant from Henry Luce Foundation.