Herbs perennial. Stems 70-90 cm, retrorse hirtellous or glabrate, yellowish glandular. Petiole 3-6 mm, very short to absent in upper leaves; leaf blade ovate-lanceolate to lanceolate, 6-8.5 × 2-3 cm, adaxially olive green, sparsely pubescent, abaxially greenish, glandular puberulent, veins hirtellous, base shallowly cordate, margin densely dentate-serrate, apex acute. Verticillasters on 3-9 upper nodes, widely spaced basally, upper 3-6 in compact spikes; bracts to 1.3 cm, linear to linear-lanceolate, glandular puberulent, ciliate. Calyx 1.1-1.3 cm, pubescent, white glandular, throat very oblique; teeth of upper lip broadly lanceolate or lanceolate-triangular; teeth of lower lip narrowly lanceolate, apex acuminate. Corolla purple or blue, 2.8-3.5 cm, sparsely pubescent outside; tube slightly incurved, base ca. 1.5 mm wide, exserted portion of narrowest part ca. as long as calyx, abruptly dilated into throat to 10 × 9 mm; lobes of upper lip to 1/2 as long as lip; middle lobe of lower lip reniform, base white barbate, margin erose, apex emarginate. Nutlets brown, obovoid-oblong, ca. 2.7 × 1.5 mm, basally attenuate, adaxially ribbed, smooth. Fl. Jul-Oct, fr. Aug-Nov.
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