S.Vietnam, Thua Thien Hue Prov., Phu Loc Distr., Bach Ma National Park, S slope of Bach Ma mt below Hai Vong Dai peak, around point 16°11′11′'N 107°50′57′'E at elev. about 1050 m a.s.l.
Mixed and broad-leaved evergreen dry secondary mt forest on very steep shale/sandstone slopes. Lithophytic and terrestrial herb along rocky shady stream slope. Flowers black, anthers yellow. Very common.
HLF 1307 23 April 2003.
Coll. L.Averyanov, N.X.Tam, N.T.Vinh. Grant from Henry Luce Foundation.