Herbs perennial. Stems 60-80 cm, densely pubescent. Petiole 0.4-3.5 cm; leaf blade broadly to narrowly lanceolate, 3.5-6(-9.5) × (1.5-)1.8-2.4 cm, papery, adaxially olive green, puberulent, abaxially grayish, densely pubescent, sometimes mixed with small yellow glands, base rounded or subtruncate to shallowly cordate, margin serrulate, apex acute. Verticillasters on 4-6 apical nodes; peduncle short, densely pubescent, glandular; bracts linear, to 8 mm, ciliate. Pedicel densely pubescent, glandular. Calyx 6-8 mm, glandular pubescent, ciliate, throat very oblique; teeth of upper lip to 1/3 as long as lip, narrowly triangular, apex acute; teeth of lower lip narrowly lanceolate, apex acuminate. Corolla purple, 1.6-2.2(-2.5) cm, ca. 1.4 cm in pistillate flowers; tube slender, slightly incurved, base ca. 1.5 mm wide, abruptly dilated into throat ca. 10 × 7 mm; upper lip ca. 5 × 5 mm, with obtuse lobes to 2.5 mm; middle lobe of lower lip inversely cordate, yellow barbate, ca. 4 × 6 mm, margin erose, apex emarginate; lateral lobes semicircular, ca. 1.5 mm. Nutlets unknown. Fl. Jul-Oct.
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