Cyathella otophylla (C. K. Schneider) C. Y. Wu & D. Z. Li.

Stems twining, to 2 m, pubescent along 1 line. Leaves opposite; petiole 1.5-5 cm, adaxially puberulent; leaf blade ovate-lanceolate, 4-11 × 2.5-8 cm, abaxially distinctly paler, membranous, minutely pilose, sometimes glabrescent, base strongly auriculate, basal lobes rounded, apex gradually acuminate. Inflorescences umbel-like or racemelike; peduncle 2-4 cm, puberulent to subglabrous; cymules up to 8-flowered. Pedicel 3-5 mm, puberulent on 1 side. Sepals ovate-lanceolate, ca. 1 × 0.7 mm, puberulent; basal glands 5. Corolla white, rotate; lobes oblong, 2-3 × ca. 1 mm, minutely puberulent inside. Corona slightly shorter than corolla, deeply 5-lobed; lobes oblong-lanceolate, narrower toward base, apex rounded to subacute, sometimes slightly 3-toothed, slightly fleshy, adaxially grooved with lateral longitudinal ridges, adaxial appendages minute or absent. Gynostegium short stipitate. Anther appendages ovate, erect; pollinia oblong. Stigma head slightly convex. Follicles lanceolate, 8-9 × ca. 1 cm, with 2 ridges or angles. Seeds ovate, ca. 6 × 3 mm; coma ca. 3 cm. Fl. Jun-Oct, fr. Aug-Dec.

The roots are used as medicine for rheumatism, epilepsy, hydrophobia, and detoxification of viper bites.

Cynanchum otophyllum previously included C. triangulare M. G. Gilbert & W. D. Stevens (C. deltoideum J. D. Hooker, not Hance) from northwestern India but that species, though very similar vegetatively, has a distinctly tubular corona, leaving C. otophyllum as a Chinese endemic.

* Thickets, open woods; 1000-3000 m. Guangxi, Guizhou, Hubei, Hunan, Sichuan, Xizang, Yunnan