Herbs perennial. Stems erect, slender, 18-25 cm, unbranched, retrorse pubescent or puberulent when young, glabrescent except on nodes. Leaves in 2 or 3 pairs, crowded upward; petiole 0.5-2.5 cm, shorter to obsolete upward; leaf blade ovate to ovate-elliptic, 5-11 × 1.5-5 cm, ± succulent, adaxially subglabrous or puberulent, abaxially subglabrous, veins pilose or sparsely pubescent, margin sparsely undulate-crenate to dentate, rarely subentire, apex acute to acuminate or sometimes rounded. Verticillasters 2-flowered, in terminal or rarely axillary racemes; bracts ovate-lanceolate to lanceolate, 2-3 mm. Pedicel ca. 2 mm. Calyx tubular, gradually open at mouth, 1.1-1.3 cm, puberulent; teeth triangular-ovate, ca. 1/3 as long as calyx, apex acuminate. Corolla purple or reddish, 3.5-4 cm, puberulent; tube straight or slightly curved, gradually dilated at apex; upper lip straight, lobes oblong; middle lobe of lower lip nearly square, apex truncate or emarginate; lateral lobes oblong, ca. 1/2 as long as middle lobe. Nutlets unknown. Fl. Jul-Sep, fr. Oct.
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