Plants perennial. Stems erect, 50-120 cm, 3-5 mm in diam., rigid. Petiole 0-10 mm; leaf blade oblong-ovate or oblong-elliptic to lanceolate, 3.8-6.5 × 1.8-2.5 cm, adaxially greenish, sparsely puberulent or subglabrous, abaxially pale, pubescent, base truncate or shallowly cordate, margin crenate or serrate, apex obtuse to acute or acuminate. Cymes numerous, axillary, many flowered, in terminal panicles 3-8.5 × 2.5 cm; bracts and bracteoles linear, 1.5-2.5 mm. Pedicel 0.3-0.5 mm. Calyx tubular, 3-4 × 1-1.2 mm, pubescent, glandular puberulent inside; teeth subequal, subulate, 1.1-1.3 mm, margin narrow, membranous. Corolla purplish, 5.5-8.5 mm, sparsely pubescent; tube ca. 0.9 mm wide at base, abruptly dilated into throat 1.5-2 × ca. 2.5 mm; upper lip straight, 1.8-2 mm, deeply divided into 2 ovate lobes; lower lip spreading, 4-6 mm, with middle lobe of lower lip broadly ovate-cordate, margin slightly undulate, apex emarginate. Nutlets brown, oblong, ca. 1.6 × 1.1 mm, adaxially ribbed, glabrous, apex minutely tuberculate, sparsely hairy. Fl. Jul-Sep, fr. Aug-Oct.
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