Stems 3-26(-48) cm, densely puberulent to glabrescent. Leaves opposite; petiole 0.2-14 cm; leaf blade narrowly ovate to ovate, oblong, or obovate, 1-14 X 1-10 cm, herbaceous, adaxially appressed puberulent, eglandular, abaxially puberulent along veins, eglandular, base oblique, broadly cuneate to cordate, margin crenate to crenulate or nearly entire, apex acute to rounded; lateral veins 5 or 6 on each side of midrib. Cymes 1-15-flowered; peduncle 1-12 cm, sparsely glandular puberulent; bracts free, ovate to orbicular, often leaflike, 0.2-2 cm, glabrous to puberulent, yellow glandular, margin crenate to entire. Pedicel 4-10 mm. Calyx slightly zygomorphic, 3-6 mm; limb indistinctly 2-lipped; tube 2-4 mm; adaxial lip 3-lobed, depressed trapeziform, ca. 2 mm, lobes triangular, 1-2 X ca. 1.2 mm; abaxial lip 2-lobed, depressed trapeziform, ca. 3 mm, lobes triangular, 1-2 X ca. 2 mm, outside sparsely puberulent, inside glabrous, margin entire. Corolla purple to reddish purple with darker stripes, 2.5-3.5 cm, outside sparsely pubescent, inside glabrous; tube narrowly funnelform, 2-2.8 cm X 4-6 mm; adaxial lip ca. 3.5 mm; abaxial lip ca. 7 mm. Filaments ca. 7 mm, glabrous; anthers ca. 2 mm, sparsely pubescent; staminodes 3, 1.2-5 mm. Pistil 2.3-3.2 cm, glabrous; ovary ca. 8 mm. Capsule 3-4.2 cm. Fl. Jun-Sep, fr. Jul-Oct.
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