Description from Flora of China
Shrubs ca. 2 m tall. Flowering branchlets purplish brown, 5-7(-11) cm, ca. 4-leaved, sparsely stellate hairy. Petiole 3-4 mm, stellate hairy; leaf blade abaxially gray, adaxially grayish green, ovate or elliptic-ovate, 3-5 × 1.5-2 cm, papery, abaxially somewhat densely 5-8(-10)-rayed stellate hairy, hairs along veins with long central rays, adaxially sparsely 3-5-rayed stellate hairy, veins in 4 or 5 pairs, base cuneate or rounded, margin serrulate, apex acuminate. Cymes 1.5-1.8 × 3-6.5 cm, 15-40(-100)-flowered; pedicels 3-5 mm. Calyx tube 3-3.5 × 2.5-3 mm, 14-17-rayed stellate hairy; lobes ovate-deltoid, 1.5-2.5 mm. Petals induplicate, pink, elliptic, 6.5-7(-9) × 1.7-2.5(-3.5) mm. Outer stamens 4-6 mm; filaments 2-dentate or shouldered at apex, teeth (if present) not reaching anthers, obtuse at apex; anthers borne between filament teeth, stalked, ovoid. Inner stamens 2-4 mm. Styles 3(or 4), subequaling outer stamens. Capsule hemispheric, ca. 3.5 mm, with persistent, incurved calyx lobes. Fl. Jun-Jul.
No specimens of Deutzia silvestrii have been seen by the present authors, one of whom (Ohba) doubts the distinctness of this species.
* Mixed forests; 300-1900 m. Hubei.