Lianas to 1 m. Branches and petioles pubescent along 1 line. Petiole ca. 1 cm; leaf blade linear-lanceolate to lanceolate, 3-7 cm × 3-15 mm, glabrous except for minute hairs along margin and midrib adaxially, base cuneate to obtuse, apex acuminate to acute; major lateral veins 2 or 3 pairs at an acute angle to midrib and up to 6 pairs of minor veins at a wider angle; older leaves with reticulate abaxial veins thickened and ± white. Cymule solitary, umbel-like, 4-6-flowered; peduncle 0.6-4 cm, slender, glabrous. Pedicel 8-10 mm, glabrous. Sepals ovate; glands absent. Corolla green, 5-6 mm in diam.; tube bowl-shaped, 1.2-2 mm; lobes ovate-oblong, ca. 1.7 × 1 mm, rotate, short pilose or glabrous inside. Corona ringlike, rim shallowly 5-cleft. Anthers orbicular; pollinia ob-long, ovaries glabrous. Follicles narrowly lanceolate, ca. 8 cm × 4 mm. Seeds oblong-elliptic, ca. 8 × 2 mm; coma ca. 2.5 cm. Fl. Jun-Aug, fr. Aug-Oct.

* Mixed forests; 200-2900 m. Guizhou, Hunan, Sichuan, Xizang, Yunnan.