Description from Flora of China
Shrubs ca. 2 m tall. Flowering branchlets 4-6 cm, ca. 4-leaved. Petiole 3-5 mm; leaf blade abaxially grayish green, ovate or elliptic-ovate, 2-5.5 × 1.5-3.5 cm, papery, abaxially densely 8-10-rayed stellate hairy, hairs along veins usually with central rays, adaxially sparsely 4- or 5-rayed stellate hairy, base rounded or broadly cuneate, margin alternately coarsely serrate and serrulate, apex acute; leaf blade on sterile branchlets usually large, margin alternately coarsely serrate and serrulate. Cymes 4-6 × 3-5 cm, 5-15-flowered; pedicels 0.8-1.2 cm. Calyx tube grayish, ca. 3 × 2.5 mm, densely 10-12-rayed stellate hairy; lobes ovate-lanceolate, ca. 2 × 1 mm. Petals induplicate, white, ovate-oblong or elliptic, 6-10 × 4-5 mm, apex obtuse or acute. Outer stamens ca. 4 mm; filaments 2-dentate at apex, teeth ± level with anthers, obtuse at apex; anthers subovoid or globose. Inner stamens ca. 3 mm; filaments 2- or 3-lobed at apex; anthers borne near apex of filaments abaxially. Styles 3 or 4, 4.5-5 mm. Capsule obconical or obcampanulate, 3-4 × ca. 3 mm, with persistent, recurved calyx lobes. Fl. Jul-Sep.
One of the present authors (Ohba) believes that this species may be synonymous with Deutzia staminea.
* Thickets, stream banks; 2000-2300 m. Sichuan.