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. Terrestrial herb on steep shady river slopes among mossy rocks. Flowers light pink, anthers yellow. Leaves uniform green, stem and petioles red-brown. Very common.
HLF 1635 4 May 2003.
Coll. N.T.Hiep, L.Averyanov, N.T.Vinh et al. Grant from Henry Luce Foundation.