Description from Flora of China
Woody climbers, up to 6 m tall, deciduous. Branchlets light green, with brownish spots, striate, glabrous. Bud scales ovoid or broadly ovoid, apices acute, ciliate. Petiole 4-10 mm, pilose; leaf blade abaxially gray, adaxially dark green, lanceolate or narrowly ovate-lanceolate when young, oblong or oblong-ovate when mature, 3.5-8 × (2-)3-4 cm, membranous, abaxially glabrous or pubescent on veins, adaxially puberulent, subglabrous when old, lateral veins 4 or 5 pairs, anastomosing 4-5 mm from margin, reticulate veins sparse, lateral and reticulate veins inconspicuous adaxially, base cuneate or rounded, apex caudate-acuminate or acuminate. Pedicel 1.5-3 mm to 1.5 cm. Flowers solitary, rarely 2-paired, green, yellowish green, or dark purple, 1-1.5 mm in diam. Sepals 5, suborbicular, ca. 0.5 × 2 mm. Petals 5, broadly ovate or suborbicular, 6-9 × 4-7 mm, enlarged to 12 mm at fruiting, 7-veined, apex rounded. Stamens 5, 4-5 mm; filaments flattened; anthers extrorse. Disk margin lobed. Ovary glabrous. Schizocarp broadly obovoid, ca. 7 × 8 mm; endocarp with midrib, foveolate-concave on one side, lateral surface concave, shaggy with unarranged strips. Fl. May, fr. Jul.
Humid valley forests, sparse forests, mountain slopes; 500-2800 m. Anhui, Fujian, S Gansu, N Guangdong, Guizhou, Hubei, Hunan, SC Jiangsu, Jiangxi, S Shaanxi, Sichuan, S Xizang, Yunnan, Zhejiang [Bhutan, N India, Nepal].