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. Lithophytic and terrestrial shrub 0.5-1.5 m in open waterfall cliffs. Flowers purple. Very common.
HLF 1627 4 May 2003.
Coll. N.T.Hiep, L.Averyanov, N.T.Vinh et al. Grant from Henry Luce Foundation.