Description from Flora of China
Pentasachme glaucescens Decaisne in A. de Candolle, Prodr. 8: 627. 1844; Cynanchum lightii Dunn; Vincetoxicum glaucescens (Decaisne) C. Y. Wu & D. Z. Li.
Herbs rhizomatous, roots fibrous, fascicled at nodes. Stems erect, to 60 cm, pubescent along 2 lines. Leaves opposite, subsessile; leaf blade glabrous, elliptic, oblong-lanceolate, or oblong, 1-7 cm × 7-12 mm, base cuneate or rounded, apex rounded to ± acute; lateral veins 3-5 pairs, obscure. Inflorescences umbel-like, sometimes with 2 cymules separated by a short rachis, shorter than leaves, glabrous or puberulent. Sepals oblong-lanceolate, ca. 2.3 × 1 mm, glabrous, basal glands 5. Corolla yellow, rotate, ca. 8 mm in diam.; lobes ovate-oblong, ca. 3.5 × 2.3 mm, obtuse. Corona shallowly cupular, 5-lobed; lobes ovate, fleshy, incurved, slightly shorter than anthers and adnate to them. Pollinia ovoid. Stigma head convex. Follicles fusiform, 4.5-6 cm × 6-10 mm. Seeds oblong, ca. 5 mm; coma ca. 2 cm. Fl. May-Nov, fr. Jul-Dec.
The roots are used as medicine for reducing phlegm and against coughs.
Mountains, riversides; 100-800 m. Fujian, Guangdong, Guangxi, Hunan, Jiangsu, Jiangxi, Sichuan, Zhejiang