Subshrubs. Stems to 1 m, brown pannose, glabrescent. Leaves opposite, spread along stem; petiole 2-10 cm; leaf blade narrowly elliptic or oblong to ovate or obovate, 5.5-26 X 2-10 cm, papery, adaxially grayish to brown pannose to puberulent, subglabrescent, abaxially brownish pannose, base sometimes oblique, cuneate to subcordate, margin subentire to serrulate, apex acute to acuminate; lateral veins 10-15 on each side of midrib. Cymes axillary, near branch apices; peduncle 2.5-6(-8) cm, brown pannose; bracts 2, suborbicular to broadly ovate, 1-1.5 X 0.8-1.2 cm, outside glandular puberulent to glabrous. Pedicel 5-12 mm. Calyx 5-sect from base or near base; segments oblong-spatulate to flabellate or obovate, 7-15 X 4-7 mm, outside glandular puberulent to glabrous. Corolla blue-purple to purple-red, 1.5-2 cm, outside glabrous; tube 1-1.3 cm; lobes 4-5 X ca. 5 mm. Filaments 6-9 mm, pubescent to glabrous; anthers ca. 4 mm; staminodes 1-3, 0.5-3 mm. Pistil glabrous; ovary 5-6 mm. Style 1.5-5 mm. Capsule spirally twisted, 2.5-5.6 cm, glabrous. Fl. May-Jul, fr. May-Nov.
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