Herbs perennial. Stems 30-60 cm, erect, puberulent. Petiole 0-2 mm; leaf blade ovate-oblong to lanceolate-oblong, 2.8-5.2 × 1.1-1.7(-2.2) cm, pubescent, adaxially olive green, abaxially gray-green, yellowish glandular, becoming black when dry, base rounded to shallowly cordate, margin crenulate-serrulate, apex acute. Verticillasters on 5 or 6 apical nodes, 2 or 3 basal nodes very widely spaced but 3 apical nodes in spikes; bracts ca. 2/3 as long as calyx, ciliate. Calyx 8-9 mm, spreading pubescent, yellowish glandular, throat very oblique; teeth of upper lip narrowly triangular, teeth of lower lip narrowly lanceolate. Corolla blue-purple, 1.8-2.5 cm, sparsely pubescent, yellowish glandular; tube incurved, exserted portion of narrowest part ca. 1/2 as long as calyx, abruptly dilated into throat ca. 6 × 4 mm; upper lip ca. 3 mm, obtusely 2-lobed; lower lip obcordate, base white barbate, apex emarginate. Nutlets unknown. Fl. Jul-Aug.
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