Quang Nam Prov., Dai Loc Distr., Dai Hong municipality, environs of Dai Hong town around point 15°49′44”N 107°57′19”E.
Rich secondary closed broadleaved evergreen forest on very steep rocky slopes composed with eroded sandstone along high waterfall sides at elev. 250-350 m a.s.l.
Dense undershrub to 0.5 m tall on shelves of high waterfall. Flowers purple-violet, anthers yellow. Very common.