Trre to ca. 5 m. tall, often sprouting from base, occasionally becoming shrubby, the trunk with longitudinally fissured corky bark ; branches gray, smooth, very diffuse above ; young shoots pale chestnut brown ; leaves rigid, scabrid, slightly glossy green above, paler below with tufts of white hairs along sides of midrib : inflorescence borne on erect subterminal racemes ; calyx green with teeth tinged red-purple ; corolla lavender, the side lobes extended forward ; style very deep blue-lavender ; upper lip of corolla with broad white region near base of each lobe, with slightly interrupted dark blue lines ; fruiting calyx darkening