S.Vietnam, Thua Thien Hue Prov., Phu Loc Distr., Bach Ma National Park, N slope of Bach Ma mt below Hai Vong Dai peak, around point 16°12′N 107°52′E at elev. 1100-900 m a.s.l.
Broad-leaved evergreen dry secondary mt forest on very steep shale/sandstone slopes. Lithophytic herb on wet crevices of open waterfall cliff. Flowers white, anthers yellow, Common.
HLF 1282 22 April 2003.
Coll. V.X.Phuong, L.Averyanov, N.X.Tam, N.T.Vinh. Grant from Henry Luce Foundation.