Trees ca. 5 m. Branchlets puberulent, later glabrescent; buds ovoid, densely brown tomentose. Leaves 15-25 cm; petiole 5-6 cm; axis sparsely brown tomentose; leaflets 3-5(-7); petiolule 1-2 mm, sparsely crisped hairy; leaflets blade ovate-lanceolate or elliptic, 5-12 2-4 cm (terminal larger, basal pair smaller), papery, abaxially sparsely crisped hairy along midrib, base blunt or broadly cuneate, slightly irregularly coarse serrate, apex long acuminate; primary veins 10-12 on each side of midrib. Panicles terminal and lateral, 8-12 cm, lax. Flowers unisexual, appearing after leaves. Pedicel 4-5 mm. Calyx campanulate, ca. 1.5 mm, teeth sharp triangular, longer than tube. Staminate flowers: corolla white, lobes linear, ca. 3 mm, caducous; stamens exceeding lobes. Samara oblanceolate-linear, ca. 3.5 cm 6 mm; wing decurrent to above middle of nutlet. Fl. May, fr. Jul-Sep.
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