Erect undershrub or shrub, branches densely pubescent. Leaf unifoliolate, 7.5-15 cm long, 2.5-6.5 cm broad, ovate or oblong-lanceolate, acute or acuminate, glabrous to subglabrous above, pubescent, especially on the nerves below, obscurely gland dotted; petiole 3-18 mm long; stipules 1.2-2.5 cm long. Inflorescence axillary and terminal branched racemes; flowers in clusters hidden by distichously arranged bracts. Bracts 1.2-2.5 cm long, reniform, broader than long, slightly emarginate, hirsute; stalked with linear subulate stipules. Calyx 4-5 mm long, pubescent, teeth exceeding the tube. Corolla white streaked with pink, rosy or purple, 6-7 mm long. Fruit 7.0-12.5 cm long, pubescent, 2-seeded.