Description from Flora of China
Stranvaesia nussia Buchanan-Hamilton ex D. Don var. oblanceolata Rehder & E. H. Wilson in Sargent, Pl. Wilson. 1: 193. 1912.
Shrubs 5–9 m tall. Branchlets purplish red when young, dark purplish brown when old, terete, glabrous, with scattered orbicular lenticels; buds purplish brown, narrowly ovoid, glabrous. Petiole 1.5–4 cm, glabrous; leaf blade oblanceolate or obovate-oblong, 8–13 × 3.5–5 cm, lucid, midvein prominently raised abaxially and slightly impressed adaxially, both surfaces glabrous, base cuneate, rarely subrounded, margin obscurely obtusely dentate, apex acute. Compound corymbs terminal, 7–9(–11) × 5–10(–14) cm, compact, many flowered; rachis and pedicels glabrous; bracts linear, 2–3 mm. Pedicel 3–5 mm. Flowers ca. 1 cm in diam. Hypanthium campanulate, abaxially glabrous. Sepals triangular-ovate, 2–3 mm, much shorter than hypanthium, margin entire, apex acute. Petals suborbicular or broadly ovate, 5–6 × 3–5 mm. Stamens 20, shorter than petals. Ovary pubescent; styles 5, not exceeding stamens, connate for more than 1/2 length; stigma capitate. Fruit ovoid, 6–8 mm in diam.; sepals erect. Fl. Apr–May, fr. Jun–Jul.
Mixed evergreen forests of mountain valleys, slopes; 1400--2000 m. S Yunnan [N Laos, N Myanmar, Thailand].