Herbs 20-40 cm tall, unbranched, isophyllous. Rhizomes swollen, fleshy. Stems 4-angled, sulcate, densely pubescent. Petiole 0-3 mm; leaf blade oblong-lanceolate, 4-18 × 1.5-3 cm, abaxially pubescent along veins, adaxially glabrous and densely covered with acerose cystoliths, secondary veins 5-9 on each side of midvein, base narrowly cuneate, margin dentate to undulate, apex acuminate. Inflorescences terminal, subcapitate spikes, 2-4(-5) cm, 4-10-flowered; rachis pubescent; bracts leaflike, obovate-elliptic, 1-2 × 0.3-1 cm, glabrous; bracteoles linear-lanceolate, ca. 8 mm, glabrous except for large-celled trichomes on margin, abaxially densely covered with white clavate cystoliths. Calyx ca. 1 cm, 5-lobed almost to base; lobes linear, unequal, glabrous except for large-celled trichomes on margin, outside densely covered with white clavate cystoliths. Corolla purple, funnel-shaped, 3.5-4.5 cm, ventricose, outside glabrous, inside glabrous except for trichomes retaining style; tube basally cylindric and ca. 3 mm wide for ca. 7 mm then gradually widened to ca. 1.5 cm at mouth; lobes oblong, ca. 4 × 3 mm, subequal, apex emarginate. Stamens 4, included; filaments pilose, shorter pair ca. 4 mm, longer pair ca. 6 mm; anther thecae oblong, ca. 1.5 mm; pollen type 3. Ovary glabrous; style filiform, ca. 3.2 cm, pubescent. Capsule glabrous, 4-seeded. Seeds ovate in outline, ca. 2.5 × 2 mm, densely pubescent. Fl. Aug-Sep, fr. Nov.
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