Perennial shrubs, prickly; stems cylindrical. Leaves opposite, linear, rigid; stipules present or absent, if present, then not forming a sheath or involucre. Inflorescence dichotomously cymose. Calyx 5-fid, much shorter than corolla, not accrescent after anthesis. Corolla dirty red or pink, infundibuliforn. Stamens 5, exserted or subexserted; filaments short, inserted near the throat of corolla tube; anthers dorsifixed. Style exserted; stigma branched. Mericarps densely hairy.