Subshrubs or woody vines. Stems often procumbent at base, at least 20-30 cm, glabrous. Petiole 3-10(-20) mm; leaf blade elliptic to ovate or narrowly obovate, 4.2-12.5 X (1.2-) 2.2-4.6 cm, leathery, glabrous, base cuneate to subrounded, margin entire with glands to denticulate, apex abruptly acuminate to obtuse; lateral veins 5 or 6 on each side of midrib, flat to obscure. Cymes 1- or 2-flowered; peduncle 0.6-2.2(-4) cm, glabrous; bracts linear, ca. 1.2 X 0.3 mm. Pedicel 5-7 mm. Calyx 5-sect from base; segments 5-9 mm, glabrous. Corolla white, 4-5.4 cm, basally sparsely puberulent; tube funnelform-tubular, 3-4.2 X 1-1.5 cm; adaxial lip 4-5 mm; abaxial lip 1-1.5 cm. Stamens ca. 1.5 cm; filaments ca. 1.3 cm; anthers globose; connective unappendaged or sometimes with small basal-abaxial swelling; staminodes 2, 4-7 mm. Disc ringlike, margin entire. Pistil 2-3 cm, glabrous. Capsule 13-21 cm. Seed appendages hairlike, 1.5-3.2 mm. Fl. Jul-Aug, fr. Aug-Nov.

* Rocks in forested valleys; 700-1800 m. W Sichuan, NE Yunnan.