Description from Flora of China
Spiraea nervosa Franchet & Savatier.
Shrubs 2–3 m tall. Branchlets tortuous, red-brown to brown, slender, densely tomentose when young, glabrous when old; buds small, with several brown scales, softly hairy initially, later glabrescent, apex acute. Petiole 2–5 mm, densely tomentose; leaf blade adaxially dark green, rhombic-ovate, 2–4.5 × 1.5–3 cm, abaxially densely white tomentose, adaxially sparsely pubescent, rugose, prominently pinnately veined, base cuneate, margin obtusely incised serrate in upper 2/3 or lobed, apex obtuse or acute. Umbels pedunculate, densely 10–20-flowered; pedicels 6–10 mm, densely gray tomentose; bracts linear, 2–4 mm, tomentose. Flowers 4–8 mm in diam. Hypanthium campanulate, gray tomentose abaxially. Sepals triangular or ovate-triangular, 1–1.5 mm, nearly as broad as long, erect in fruit, rarely reflexed. Petals white, broadly obovate or suborbicular, 2–3 × 2–3 mm, glabrous, base shortly clawed, apex emarginate or obtuse. Stamens 20–22, ca. 1/2 as long as petals. Disk annular, 10-lobed; lobes broad. Styles shorter than stamens. Follicles spreading, white tomentose throughout; styles divergent, rarely suberect. Fl. May–Jun, fr. Jul–Aug.
Forests, open dry slopes, roadsides; 400--1200 m. Gansu, Hebei, Hubei, Jiangsu, Jiangxi, Liaoning, Nei Mongol, Shanxi, Zhejiang.