Trees to 15 m. Branchlets nearly 4-angled, rusty tomentose at first, glabrescent; buds naked. Leaves 10-20(-25) cm; petiole 3-5 cm; leaf rachis and petiolule rusty tomentose; leaflets 9-11(-15); petiolule 2-5 mm; leaflet blade ovate-lanceolate to obliquely oblong, 3-6 × 1-2.5 cm, thin leathery, sparsely scurfy hairy or glabrescent, base attenuate to petiolule or broadly cuneate, margin entire to subentire, apex acuminate to obtuse; primary veins 6-9 on each side of midrib, often villous abaxially. Panicles terminal, to 20 cm in diam., many flowered, congested; bracts lanceolate-linear, 2-6 mm, ± glabrous, persistent. Flowers polygamous, appearing after leaves. Pedicel ca. 3 mm. Calyx cupular, ca. 1.5 mm, apically truncate, puberulent. Corolla white, ca. 3 mm. Stamens subequal to corolla lobes. Samara linear-spatulate, ca. 3.2 cm × 4-5 mm, densely scurfy hairy; wing decurrent to middle of nutlet. Fl. Jun-Jul, fr. Jun-Aug.
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