Perennials, rhizomatous. Stems 40-90 cm, glabrous. Petiole 0.2-4 cm; leaf blade oblique, 1 side elliptic, other side ovate, 6-22 X 2-8 cm, adaxially sparsely puberulent, abaxially glabrous, base strongly oblique, cuneate on smaller side, broadly cuneate, rounded, or subtruncate on other, margin subentire, indistinctly denticulate, apex long acuminate. Cymes 2.5-6 cm, 2-12-flowered, puberulent, glabrescent; peduncle 6-8 mm, glabrous. Calyx 1.6-2 cm; lobes 5-8 mm. Corolla deep purple, ca. 2.1 cm, inside glabrous; tube ca. 1.5 cm X 4 mm; adaxial lip ca. 3.5 mm; abaxial lip ca. 5 mm, 3-lobed. Stamens 4; anthers ca. 1.8 mm, thecae divaricate; staminodes absent. Disc ca. 0.2 mm. Pistil ca. 6 mm, glabrous. Style ca. 2 mm. Capsule surrounded by persistent calyx, ca. 9 mm. Fl. Aug-Sep.
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