Stems 11-62 cm, puberulent above, sparsely puberulent to glabrescent below. Leaves opposite; petiole 0.3-11 cm; leaf blade ovate to elliptic or obovate, 3-17(-26) X 1.6-10.5(-16) cm, herbaceous, adaxially sparsely appressed puberulent to glabrous, sparsely glandular, abaxially puberulent to nearly glabrous along veins, sparsely glandular, base sometimes oblique, cuneate to cordate, margin single to double serrate, apex acute to acuminate; lateral veins 5-9 on each side of midrib. Cymes 5-12-flowered; peduncle 4-10 cm, glabrous; bracts often connate at base, ovate to elliptic-ovate, 3-8 mm, glabrous, margin entire. Pedicel 1-5 mm. Calyx slightly zygomorphic, 1-1.2 cm; limb indistinctly 2-lipped; tube 8-9 mm; adaxial lip 3-lobed, depressed trapeziform, 2-3 mm, lobes semiorbicular, 2-3 X ca. 3 mm; abaxial lip 2-lobed, lobes semiorbicular, 2-3 X 4-5 mm, glabrous, margin entire. Corolla purple to pinkish purple with darker stripes, 3.2-4.5 cm, glabrous; tube funnelform, 2.9-3.3 X 0.9-1 cm; adaxial lip 3.5-4 mm; abaxial lip 0.9-1.2 cm. Filaments ca. 1 cm, glabrous; anthers ca. 3 mm, puberulent; staminodes 2, 1.5-3 mm. Pistil 2.2-2.4 cm, sparsely puberulent; ovary ca. 2.3 cm. Capsule 3.5-5.5 cm. Fl. Aug-Sep.
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