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. Lithophyte on shady mossy rocks and cliffs. Stem violet. Rare.
HLF 1600 4 May 2003.
Coll. N.T.Hiep, L.Averyanov, N.T.Vinh et al. Grant from Henry Luce Foundation.