Trees 5-15 m tall, andromonoecious. Bark brown or dark brown. Branchlets slender, glabrous; winter buds ovoid. Leaves deciduous; petiole 2-3 cm, slender, glabrous; leaf blade abaxially pale green, 6-9 × 2-13 cm, membranous, both surfaces glabrous, primary veins 3, base rounded or rounded-truncate, usually 3-lobed, rarely 5-lobed; lobes triangular-ovate, rarely ovate-oblong, margin serrulate, with appressed acute teeth, entire near base, rarely only with a few small serrations near apex, apex acute or acuminate, rarely caudate-acuminate. Inflorescence shortly paniculate. Pedicel 5-8 mm. Sepals 4, ovate-oblong, apex obtuse. Petals 4, obovate. Stamens 8. Disk villous, extrastaminal. Ovary densely white pilose; style glabrous; stigmas recurved. Fruit yellowish; nutlets convex, ca. 6 mm in diam., veined; wing including nutlet 1.5-2.5 cm × 8-10 mm, wings spreading acutely to nearly horizontally. Fl. Apr, fr. Sep.
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