Shrubs to 1.5 m tall, weakly anisophyllous, drying blackish. Stems ± 4-angled, glabrescent. Petiole 0.5-3 cm, scurfy pubescent; leaf blade ovate, elliptic, or oblong-elliptic, 8.5-15 × 3.5-7 cm, abaxially puberulent along veins, adaxially glabrous, both surfaces densely covered with cystoliths, secondary veins 8 or 9 on each side of midvein, base cuneate to attenuate, margin dentate, serrulate, or subentire, apex acuminate. Inflorescences terminal and from apical leaf axils, simple spikes, 4-9 cm, solitary; peduncle 0.3-1 cm, rust-colored pubescent; bracts lanceolate, ca. 2.4 × 0.6 cm, persistent, rust-colored pilose, apex acuminate; bracteoles lanceolate, ca. 5 × 4 mm, rust-colored pilose, apex long acuminate and aristate. Flowers imbricate on rachis. Calyx 1.7-1.8 cm, 5-lobed almost to base; lobes lanceolate, 16-17 × ca. 2 mm, subequal, rust-colored pilose, apex acuminate. Corolla purple, 3.5-4 cm, slightly curved, outside glabrous, inside glabrous except for trichomes retaining style; tube basally cylindric and ca. 3 mm wide for ca. 1 mm then gradually widened to ca. 1.3 cm at mouth; lobes ovate, ca. 7 × 7 mm, apex obtuse. Stamens 4, included; filaments sparsely pubescent, shorter pair ca. 2 mm, longer pair ca. 4 mm; anther thecae oblong, ca. 2 × 1.3 mm; pollen type 3. Ovary pilose; style ca. 2.7 cm; stigma ca. 3 mm, pubescent. Capsule fusiform, 2-2.2 cm, pilose, 4-seeded. Seeds ovate in outline, ca. 4 × 3.5 mm, appressed pubescent. Fl. Sep-Oct, fr. Dec.
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