Herbs perennial, fetid. Stems erect, to 55 cm, obtusely 4-angled, retrorse pubescent toward apex, subglabrous basally, internodes 2.5-6 cm. Petiole 3-8 mm; leaf blade pinnatisect, elliptic-ovate to elliptic, 2.6-4(-7.5) × 1.4-2.5(-4.2) cm, base broadly cuneate, adaxially glabrous, abaxially glabrous to densely gray pubescent; segments in 2 or 3 pairs, linear, 0.7-1.9(-3) cm × 1-2(-3) mm, ter-minal section 1.4-2.8(-4.4) cm, margin entire, involute. Verticillasters 2-6-flowered, in 5-9 upper stem nodes; floral leaves similar to cauline leaves but much reduced, with 1 pair of segments, 5-7 mm, pubescent, ciliate. Calyx purplish, 1-1.4 cm, densely spreading pubescent, golden glandular, split to 1/3 its length; teeth margin ciliate, apex acute; upper lip teeth broadly lanceolate, middle tooth subequal to lateral lobes, lower lip teeth lanceolate. Corolla purple-blue to dark purple, 2-2.7 cm, pubescent, lower lip 2 × as long as upper lip. Fl. Jun-Sep.
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