Trees 10-15 m tall, andromonoecious. Bark dark brown, smooth. Branchlets slender, glabrous; winter buds small, scales 6, slightly villous outside. Leaves deciduous; petiole 2-3 cm; leaf blade ovate, 7-12 × 9-12 cm, membranous or subleathery, base usually rounded, rarely truncate or subcordate, usually 3-lobed, occasionally with 2 or more basal lobes; lobes ovate-oblong, triangular-ovate, or lanceolate, margin entire except occasionally with a few small appressed serrations apically, apex caudate-acuminate. Inflorescence paniculate, 5-6 cm, glabrous; peduncles 2-3 cm, slender. Sepals 5, glabrous. Petals 5, white. Stamens 8; filaments glabrous. Disk glabrous, extrastaminal. Ovary pilose; style nearly glabrous; stigmas short. Infructescence pendulous. Nutlets ovoid; wing including nutlet 2.5-3 cm; wings spreading horizontally. Fl. Apr, fr. Sep. 2n = 26.
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