Description from Flora of China
Shrubs 2-3 m tall. Branchlets stout, glabrous, sometimes glandular hairy, unarmed. Buds brown, ovoid to oblong, 4-6 mm, glabrous, apex obtuse or acute. Petiole 4.5-8(-10) cm, glabrous or sparsely puberulent when young, sometimes glandular hairy near base; leaf blade ovate, 5-12 cm, glabrous or slightly pubescent at vein axils at base abaxially, rarely pubescent on both surfaces, base deeply cordate; lobes 3(-5), ovate to triangular-ovate, margin irregularly coarsely serrate, sometimes also with sparse, double teeth; terminal lobe longer than lateral ones. Racemes pendulous, lax, 15-35(-40) cm, 15-20(-25)-flowered; rachis and pedicels puberulent; bracts suborbicular or ovate to ovate-lanceolate, rarely oblong, (1.5-)3-7 mm, glabrous or puberulent. Flowers bisexual, 5-6 mm in diam.; pedicel 3-10(-15) mm. Calyx green tinged purple, glabrous, rarely pubescent; tube tinged red, campanulate to shortly cylindric, 4-6 mm; lobes erect, green, oblong to subligulate, 2-3 mm. Petals subflabellate, ca. 1/2 as long as calyx lobes. Stamens inserted below petals, longer than calyx lobes and exserted; anthers white. Ovary glabrous, rarely pubescent. Style slightly longer than stamens, entire or stigma 2-lobed. Fruit black, globose, 0.7-0.9 cm, glabrous or sparsely pubescent. Fl. Apr-May, fr. Jun-Aug.
* Forests or thickets on mountain slopes or in valleys, mixed forests in gullies; 1100-3800 m. SE Gansu, W Hubei, E Shaanxi, Sichuan, Yunnan.