Subshrubs. Stems 10-100 cm, glabrous. Petiole 1-16(-28) mm; leaf blade elliptic to lanceolate, ovate, or obovate, 4-14 (-18) X 2-4.8(-5.5) cm, herbaceous, seldom papery, glabrous, base cuneate to rounded, margin dentate to serrate or crenulate, apex acuminate to obtuse; lateral veins 5-8(-10) on each side of midrib, flat to prominent. Cymes 3-15-flowered; peduncle 3.5-10 cm, glabrous; bracts ovate to orbicular, 3.5-10 X 4-8.5 mm. Pedicel 3-11 mm. Calyx 5-sect from base; segments 4-8 X 1.5-4 mm, glabrous. Corolla purplish to white, 2.5-4.5 cm, outside sparsely puberulent, inside sparsely glandular puberulent basally; tube slender funnelform, 2.2-3 X 0.8-1 cm; adaxial lip ca. 4 mm; abaxial lip 8-10 mm. Stamens 0.8-1.2 mm; filaments 7-10 mm; anthers subglobose; connective appendage hornlike, ca. 1 mm; staminodes 3, 0.5-6 mm. Disc ringlike, margin entire. Pistil ca. 2.2 mm, glabrous. Capsule 7-11 cm. Seed appendages hairlike, 1-1.2 mm. Fl. Jul-Sep, fr. Aug-Jan.
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