Description from Flora of China
Deutzia crassifolia var. pauciflora (Rehder) S. M. Hwang; D. pauciflora (Rehder) Zaikonnikova; D. purpurascens (Franchet ex L. Henry) Rehder var. pauciflora Rehder.
Shrubs semievergreen, 1-3 m tall. Flowering branchlets 2-4 cm, stellate hairy, hairs with papilliform base. Petiole 1-5 mm; leaf blade abaxially red-brown, adaxially green, ovate or oblong-ovate, 1.5-9 × 1-4.5 cm, leathery or papery, abaxially 5-8-rayed stellate hairy, adaxially reticulate rugose when dry, 4- or 5-rayed stellate hairy, veins in 5 or 6 pairs, elevated abaxially, impressed adaxially, base rounded, margin thorny serrate or serrulate, apex acuminate. Cymes 2-3 × 3-4 cm, 1-35-flowered; pedicels 3-10 mm. Calyx tube gray-green, ca. 3.5 × 2.5 mm, appressed 7- or 8-rayed stellate hairy; lobes ovate or deltoid, rarely ovate-oblong, 1.5-2 × ca. 2 mm, apex obtuse or acute. Petals induplicate, white, elliptic or oblong, 6-8 × 3-5 mm. Outer stamens 5-6 mm, filaments 2-dentate at apex, teeth ± level with or exceeding anthers. Inner stamens 4-5 mm; anthers borne near middle of filaments abaxially, stalked. Styles 3 or 4, 2.5-3 mm, glabrous. Capsule dark gray, subglobose, ca. 4 mm in diam., with persistent, incurved calyx lobes. Fl. Mar-Apr, fr. May-Jun.
* Forests, valleys; 1700-2400 m. Xizang, S Yunnan.