Herbs perennial. Stems to 1 m, to 4-5 mm in diam., rigid, erect, basally dark purple, subglabrous or sparsely short simple hairy, apically densely pilose, finely glandular. Petiole 3-5 mm; leaf blade lanceolate, to 15 × 3.5-4(-7) cm, thin, papery when dry, adaxially dark green, glabrous or sparsely simple hairy, abaxially greenish gray, sparsely pilose, densely yellow glandular, base rounded-truncate to cuneate or rarely obtuse, margin serrate, entire on upper blades, apex acuminate or acute. Verticillasters 4-7, forming spikes 2-6(-9) cm; peduncle 0.4-3 cm; bracts narrow lanceolate, 4-7 mm. Pedicel to 1.5 cm. Calyx 8.5-9.5 mm, densely fine glandular; teeth lanceolate, apex acuminate, posterior teeth ca. 2/5 as long as tube, anterior longer. Corolla 1.7-2 cm, densely short glandular hairy, narrowest part of tube exserted to 1/3 its length, gradually dilated into broad throat 5-7 × 5-7 mm; upper lip 2.5-3.5 mm, middle lobe reniform, 3-4 × 7-7.5 mm, apex broadly emarginate; lateral lobes triangular, 2-2.2 × 2.8-3 mm. Nutlets brown, ellipsoid-obovoid, 2.5-2.6 × 1-1.2 mm, indistinctly ribbed adaxially. Fl. Jun-Jul, fr. Aug.
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