Herbs perennial. Stems numerous, 30-160 cm tall. Petiole (2-)4-20 mm; leaf blade broadly lanceolate to oblong-lanceolate, 4-8 × 1.5-2.5 cm, thin papery, adaxially densely puberulent, abaxially sparsely pubescent, with small yellowish white glands, base rounded to shallowly cordate, margin somewhat unequally crenulate-serrate, apex acute. Verticillasters on 3-8 apical nodes, short pedunculate; bracts linear, to as long as calyx, densely yellow glandular puberulent. Calyx (6-)8-11 mm, yellow glandular puberulent, throat very oblique; teeth of upper lip ca. 1/3 as long as lip, broadly lanceolate or lanceolate-triangular; teeth of lower lip narrowly lanceolate. Corolla purple-blue or bluish, puberulent, 1.3-1.5 cm in pistillate flowers, to 2.1 cm in bisexual flowers; tube slightly incurved, slender, narrowest part slightly exserted, abruptly dilated into throat to 5 mm wide; upper lip ca. 4 × 4 mm, divided into 2 obtuse lobes ca. 1/2 as long as lip; middle lobe of lower lip obovate, ca. 3 mm, margin undulate, apex emarginate; lateral lobes subcircular, ca. 1 mm. Nutlets grayish brown, oblong, somewhat flattened, ca. 2 × 1.4 mm, adaxially ribbed, minutely pubescent. Fl. Aug-Sep, fr. Sep-Oct.
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