Description from Flora of China
Sibiraea laevigata (Linnaeus) Maximowicz var. angustata Rehder in Sargent, Pl. Wilson. 1: 455. 1913.
Shrubs to 2.5 m tall. Branchlets slightly pubescent when young, glabrescent; buds ovoid or trigonous-ovoid, slightly pubescent on scale margins. Leaves solitary at axils on current year’s growth, clustered on older branchlets; leaf blade narrowly lanceolate or oblanceolate, rarely long elliptic, 2–8 × 1.5–2.5 cm, glabrous on both surfaces, base cuneate, apex acute or apiculate. Panicles 5–8 × 4–6 cm; peduncle densely pubescent; bracts 2–3 mm, glabrous on both surfaces, apex acuminate. Flowers ca. 8 mm in diam.; pedicel 3–5 mm, pubescent. Hypanthium pubescent abaxially. Sepals broadly triangular, ca. 1.5 mm, pubescent on both surfaces. Petals white, broadly obovate, base cuneate, apex rounded. Carpels glabrous. Follicles ca. 4 mm; fruiting pedicel 3–5 mm, pubescent. Fl. Jun, fr. Aug–Sep.
Open forests, slopes, valley roadsides; 3000--4000 m. Gansu, Qinghai, Sichuan, Xizang, Yunnan.