Tylophora chungii Merrill ex F. P. Metcalf; T. shikokiana Matsumone ex Nakai; Vincetoxicum floribundum (Miquel) Franchet & Savatier.

Lianas slender, to 3 m. Stems puberulent along 1 side. Petiole 5-10 mm, puberulent; leaf blade oblong-ovate to ± hastate, 3-5 × 0.6-2.5 cm, membranous to thin papery, abaxially minutely papillate, base cordate to rounded, apex acute or acuminate; lateral veins 3-5 pairs. Inflorescences lax, longer than leaves, to 11 cm; peduncle zigzag; rachis branched, internodes to 1.6 cm; cymules few flowered, racemelike or umbel-like. Sepals oblong-lanceolate; glands 5. Corolla purple, rotate, ca. 2 mm in diam., glabrous; lobes ovate. Corona lobes ovate, obtuse, apex reaching base of anthers. Anthers nearly square, appendages rounded; pollinia subglobose, horizontal. Stigma head subapiculate. Follicles linear-lanceolate, 4-6 cm × 4-5 mm. Seeds ovate, ca. 4 × 2 mm; coma ca. 2 cm. Fl. May-Sep, fr. Aug-Dec.

The roots are used for the treatment of infantile convulsions, diphtheria, traumatic injury, toothache, and snake bites.

Thickets, open woods; 100-700 m. Guangdong, Guangxi, Guizhou, Hunan, Jiangsu, Jiangxi, Zhejiang [Japan, Korea]