Trees 5-8 m. Branchlets and leaf rachis puberulent and scurfy hairy; buds ovoid, yellowish tomentose, becoming black. Leaves 7-15 cm; petiole purple, 2-3 cm, puberulent; leaflets 3-5(-7), sessile or with petiolule ca. 5 mm; leaflet blade ovate to lanceolate, 2.5-8 × 1.5-4.5 cm (terminal one largest), papery to thin leathery, glabrous or densely white pubescent along midrib abaxially, base blunt or attenuate, margin entire or serrate over middle, apex acute or acuminate; primary veins 7-10 on each side of midrib. Panicles terminal or lateral, 7-12 cm, many flowered, congested. Flowers polygamous, appearing after leaves. Staminate flowers: calyx inconspicuous; corolla white to yellowish, lobes linear-lanceolate, 3-5 mm, acute. Bisexual flowers with shorter corolla lobes. Samara purple, linear or linear-spatulate, ca. 2.5 cm × 4 mm, usually red glandular dotted and scurfy hairy; wing decurrent to middle of nutlet, apex rounded or retuse. Fl. May-Jun, fr. Sep.
Mountains and hills, C. and S. Japan. Woods on slopes and by streams in ravines; at elevations from 500-1,200 metres.
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