S.Vietnam, Thua Thien Hue Prov., Phu Loc Distr., Bach Ma National Park, N slope of Bach Ma mt system, to the N-NW of point 16°12′11′'N 107°50′23′'E at elev. 400-600 m a.s.l.
Broad-leaved evergreen wet primary closed forest on very steep sandstone, shale and granite slopes along rocky stream canyon. Terrestrial herb or semishrub about 0.5 m tall on steep slope. Flower yellow. Not common.
HLF 1511 30 April - 1 May 2003.
Coll. N.T.Hiep, L.Averyanov, N.T.Vinh et al. Grant from Henry Luce Foundation.