Annual or weak perennial herb 0.2-0.6 m tall, somewhat woody and branching near the base; stems sparingly to densely villous with long spreading hairs, or rarely almost glabrous. Leaves subsessile or shortly petiolate; blade linear-lanceolate to oblong-lanceolate or ovate-lanceolate, 20-50 x 5-15 mm, sparingly to densely pilose or canescent, often with long and short hairs intermingled, apex acute, base cuneate to attenuate, margin distinctly to obscurely and somewhat distantly toothed. Inflorescence simple or with a pair of branches near the base, lax, 80-200 mm long; verticils 4-6-flowered; bracts early deciduous, ovate, 3 x 2 mm. Calyx 6-8 mm long at maturity, glandular-hispid to villous. Corolla pinkish to lilac or violet, 13-15 mm long; tube 9-12 mm long, expanding to 2.5-3 mm wide at the mouth; lower lip 3 mm long. Stamens exserted beyond the lower lip; upper pair attached 2-3 mm from the base of the tube, filaments puberulous near the base; upper pair united for the greater part of their length. Stigma somewhat clavate.