Description from Flora of China
Deutzia glomeruliflora Franchet var. forrestiana Zaikonnikova.
Shrubs 1-2.5 m tall. Flowering branchlets 3-10 cm, 2-4(-6)-leaved, stellate hairy. Petiole 1.5-2.5 mm; leaf blade abaxially grayish green, ovate-lanceolate or lanceolate, ovate or broadly so on basal branchlets, 2.5-5 × 1-2 cm, papery, abaxially densely 7-11(-14)-rayed stellate hairy, indumentum continuous, hairs along veins and on young leaf blade usually with central rays, adaxially 5- or 6-rayed stellate hairy, veins in 4-6 pairs, base cuneate or broadly so, margin serrulate, apex acute or acuminate. Cymes aggregate, 5-7 × 3-4 cm, 9-20-flowered; pedicels 3-10 mm. Calyx tube ca. 3.5 × 3 mm; lobes subulate, subequaling tube, slightly leathery, apex acuminate. Petals white, narrowly elliptic, 8-12 × 3-5 mm, margin crisped, apex acute. Outer stamens 5-7 mm; filaments 2-dentate at apex, teeth ± level with or exceeding anthers; anthers stalked, oblong. Inner stamens 4-6 mm; filaments obtuse or acute at apex; anthers borne near apex of filaments abaxially. Styles 3 or 4, 4-6 mm. Capsule gray-brown, hemispheric, 4-4.5 mm in diam., with persistent, recurved calyx lobes. Fl. Jun-Jul, fr. Aug-Oct.
* Forest margins, thickets, mountain slopes; 2000-2500 m. S Sichuan, NW Yunnan.