Shrubs or small trees, 3–7 m tall. Branchlets dark gray to brown gray, terete, glabrous, lenticellate; buds ovoid, 4–8 mm, apex acute to shortly acuminate; scales several, brownish, glabrous. Leaves imparipinnate, together with rachis 10–17 cm; petiole 1.5–2.5 cm; stipules lanceolate, 3–6 mm, herbaceous or submembranous; rachis shallowly sulcate, abaxially glabrous or subglabrous, slightly winged; leaflet blades 10–14(–18) pairs, terminal and basal ones smaller than others, at intervals of 5–9 mm, pale abaxially, dark green adaxially, oblong or ovate-oblong, 1.5–2.5 × 0.5–0.8 cm, abaxially pubescent or subglabrous only at base of midvein, adaxially glabrous, base obliquely rounded, with 5–8 minute sharp teeth on each margin above middle or only near apex, apex acute or ± obtuse. Compound corymbs 5–9 × 6–10 cm, densely flowered; rachis and pedicels glabrous or slightly pubescent; bracts linear or lanceolate, 3–5 mm, membranous, usually glabrous. Pedicel 2–3 mm. Hypanthium campanulate, abaxially glabrous. Sepals triangular-ovate, 1–2 mm, apex obtuse. Petals white, broadly ovate, 3–3.5 × 2–3 mm, glabrous, apex ± obtuse. Stamens 20, ca. 1/2 as long as petals. Styles 5, nearly as long as stamens, glabrous. Fruit white, ovoid, 6–8 mm in diam., glabrous; sepals persistent. Fl. May–Jun, fr. Sep–Oct. 2n = 34*.
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