Description from Flora of China
Deutzia baroniana Diels var. insignis Pampanini; D. grandiflora var. glabrata Maximowicz; D. grandiflora var. minor Maximowicz.
Shrubs ca. 2 m tall. Flowering branchlets yellow-brown, very short initially, elongating to ca. 4 cm, 2-4-leaved, stellate hairy, hairs with central rays. Petiole 1-4 mm; leaf blade abaxially grayish, ovate-rhomboid or elliptic-ovate, 2-5.5 × 1-3.5 cm, papery, abaxially appressed 7-11-rayed stellate hairy, indumentum continuous, hairs along veins with central rays, adaxially 4-6-rayed stellate hairy, veins in 5 or 6 pairs, base cuneate or broadly so, margin irregularly serrulate, apex acute. Cymes 1-3 × 1-3 cm, 1-3(-5)-flowered; pedicels 3-12 mm. Calyx tube ca. 2.5 × 4 mm, densely gray-yellow stellate hairy, hairs sometimes with central rays; lobes linear-lanceolate, longer than tube, 1-1.5 mm wide. Petals induplicate, white, oblong or ovate-oblong, ca. 1.5 × 7 mm. Outer stamens 6-7 mm; filaments 2-dentate at apex, teeth horizontal or recurved, falcate; anthers stalked, ovoid-oblong. Inner stamens shorter than outer ones. Styles 3(or 4), subequaling stamens. Capsule hemispheric, 4-5 mm in diam., stellate hairy, with persistent, recurved calyx lobes. Fl. Apr-Jun, fr. Sep-Nov.
* Thickets, mountain slopes, valleys; 800-1600 m. Gansu, Hebei, Henan, ?Hubei, Hunan, ?Jiangsu, Liaoning, ?Nei Mongol, Shaanxi, Shandong, Shanxi.