Vincetoxicum biondioides (W. T. Wang) C. Y. Wu & D. Z. Li.

Rhizomes ca. 3 mm in diam. Stems twining, to 2 m, pubescent along 1 line. Petiole 5-10 mm; leaf blade narrow elliptic, 3.5-13 × 0.5-1.8 cm, papery, glabrous or adaxially scabrous, base cuneate to shallowly cordate, apex acute to rounded-apiculate; lateral veins obscure. Inflorescences umbel-like, 5-10-flowered; peduncle 0-8 mm, puberulent. Pedicel 5-10 mm, slender, puberulent. Sepals ovate, 1.2-2 × 0.8-1.3 mm, glabrescent; basal glands many. Corolla yellow-green; tube ca. 2 mm; lobes erect, ovate, 4-5 × 2.5-3 mm, glabrous. Corona 1.5-1.7 mm, ca. 1/2 as high as gynostegium; lobes triangular-ovate, apex rounded, adnate ventrally to anthers. Anther appendages ovate; pollinia ovoid. Stigma head elevated. Fl. Mar-Jul.

* Thickets; ca. 2100 m. Yunnan (Luquan, Lancang).