Perennials, 40-120 cm tall, usually branched. Roots often fusiform. Stems quadrangular, mostly glabrous, rarely basally pubescent. Leaves all green; petiole 0.5-2.5 cm; leaf blade ovate to ovate-lanceolate, glabrous, 5-14 X 2-5 cm, base truncate, rounded, or cuneate, margin double serrate, apex acute to acuminate. Thyrses terminal, lax, large; cymes terminal and axillary, 2-9-flowered; peduncle glandular pilose. Pedicel 0.8-2 cm, glandular pilose. Calyx 3-5 mm; lobes ovate, apex obtuse to acute. Corolla purplish, urceolate, 7-12 mm; tube cylindric, 4-5 mm; lower lip ca. 1.5 mm; upper lip 3.5-4 mm, lobes rounded. Stamens ca. 1.5 mm longer than corolla tube; filaments white glandular; staminode obovate. Ovary glabrous. Style 3-5 mm. Capsule globose, 6-8 X 6-7 mm, apex pointed.
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