Stems ca. 45 cm, sparsely puberulent, subglabrescent, sometimes branched. Leaves opposite, spread along stem, subequal in a pair; petiole 0.5-2.5 cm, sparsely puberulent; leaf blade ovate to ovate-oblong, 9-17 X 4-7.2 cm, glabrous, abaxially sparsely puberulent along veins, base oblique, rounded to cuneate, margin repand, apex acuminate. Cymes branched 2-5 , ca. 10-flowered; peduncle 14-16 cm, sparsely puberulent; bracts lanceolate to ovate, 3-4 X 1.5-1.8 mm, margin entire. Pedicel 1.6-2 cm. Calyx 5-sect from near base; segments equal, lanceolate, 4.5-6 X ca. 2 mm, margin entire. Corolla purple, ca. 3.3 cm, outside sparsely puberulent, inside glabrous; tube 1.8-2 X 1-1.7 cm; adaxial lip lobes semiorbicular, 4-5 X ca. 5 mm; abaxial lip ca. 1.5 cm, central lobe broadly ovate, ca. 8 X 10 mm, lateral ones ovate, 6-7 X ca. 8 mm. Adaxial stamens ca. 1 cm, abaxial ones ca. 1.3 cm, glabrous; staminode ca. 2 mm. Pistil ca. 1.6 cm; ovary densely puberulent. Style ca. 1 cm, sparsely puberulent. Fruit unknown. Fl. Nov.
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