Description from Flora of China
Shrubs 1-2 m tall. Flowering branchlets brownish, 4-6(-12) cm, ca. 6-leaved, stellate hairy, hairs with papilliform base. Petiole 1-3 mm; leaf blade abaxially greenish, ovate, elliptic-ovate, or ovate-lanceolate, 4-6 × 1.5-2.5 cm, papery, abaxially sparsely 5-7(or 8)-rayed stellate hairy, indumentum discontinuous, hairs along veins with papilliform base, adaxially 4- or 5-rayed stellate hairy, hairs with central rays, veins in 4 or 5 pairs, elevated abaxially, base rounded or broadly cuneate, margin serrulate, apex obtuse or acute. Cymes 3-8 × 4-6 cm, 9-40-flowered; pedicels 3-5 mm. Calyx tube 2.5-3 × ca. 1 mm; lobes lanceolate, 2.5-3 × ca. 1 mm. Petals white, elliptic or obovate-elliptic, 4.5-7 × 3.5-5 cm, margin erose, apex obtuse. Outer stamens 2.5-3.5 mm; filaments 2-dentate at apex, teeth exceeding anthers; anthers stalked, ovoid. Inner stamens 1.5-2 mm; filaments 2- or 3-lobed or obtuse at apex; anthers borne at middle of inner filaments abaxially. Styles 3, ca. 1 mm. Capsule hemispheric, 3-3.5 mm in diam., with persistent, recurved calyx lobes. Fl. May-Jun, fr. Aug-Sep.
* Forests; ca. 1200 m. Gansu, Shaanxi.