Herbs perennial. Stems 35-70 cm, erect, sparsely retrorse pubescent. Petiole 0-4 mm; leaf blade oblong-ovate to elliptic-ovate, 4-7.4 × 1.9-3 cm, papery, adaxially olive green, sometimes blackish, densely puberulent, abaxially greenish, sparsely pubescent, yellowish glandular, base shallowly cordate or subtruncate, margin crenate, apex obtuse. Verticillasters on 2-6 apical nodes; bracts lanceolate to linear, ca. 1/2 as long as calyx or slightly shorter, long ciliate. Calyx 0.9-1.1 cm, sparsely villous, with a mixture of long ciliate and glandular puberulent hairs, throat very oblique; upper lip ca. 3 mm, teeth triangular; lower lip ca. 2.5 mm, teeth lanceolate, apex acuminate. Corolla purple or blue, sometimes white, 1.8-2.5 cm, sparsely pubescent or subglabrous; tube slightly incurved, exserted portion of narrowest part slightly shorter than calyx, abruptly dilated into throat, to 10 × 8 mm; lobes of upper lip to more than 1/2 as long as lip; middle lobe of lower lip obcordate, base white barbate, margin undulate, apex emarginate. Style exserted. Nutlets black-brown, oblong, flattened, ca. 2.8 × 1.5 mm, adaxially ribbed, smooth. Fl. Jul-Sep, fr. Sep-Nov.
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