Subshrubs. Stems 18-50 cm, glabrous. Petiole 5-20 mm; leaf blade narrowly elliptic to ovate, 5-13 X 2.8-6 cm, papery, glabrous, base broadly cuneate to rounded, margin serrate to dentate, apex acuminate to acute; lateral veins 4-6 on each side of midrib, flat. Cymes 2-11-flowered; peduncle 1.5-5 cm, glabrous; bracts broadly ovate, base cordate, ca. 7 X 11 mm. Pedicel ca. 3 mm. Calyx 0.9-1.2 cm, 5-lobed from middle to above middle; tube 6-10 mm; lobes 2-6 X 3-5 mm, glabrous. Corolla white or tinged purple, 3.6-4.2 cm, glabrous; tube funnelform-tubular, 2.6-3 X 0.9-1.2 cm; adaxial lip ca. 5.5 mm; abaxial lip 1-1.2 cm. Stamens ca. 1 cm; filaments 8-10 mm; anthers oblate; connective appendage hornlike, 1.2-1.8 mm; staminodes 3, 0.5-6 mm. Disc ringlike, margin entire. Pistil 2-2.2 cm, glabrous. Capsule 9-13 cm. Seed appendages hairlike, 1.5-2 mm. Fl. Jun-Jul, fr. Aug.
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