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General DescriptionTrees usually 3-5 m tall, rarely to 15 m tall, andromonoecious. Bark yellowish brown or dark brown, smooth. Branchlets slender, glabrous; winter buds small, scales 6, villous along margin. Leaves deciduous; petiole 3-5 cm, sturdy, glabrous; leaf blade 9-14 cm long, 9-15 cm wide, subleathery, glabrous or glabrescent except for tufts of yellowish hairs at vein axils, base cordate or subcordate, rarely truncate, usually 5-lobed, rarely 7-lobed; lobes oblong-ovate or triangular-ovate, margin slightly serrate or undulate except near base, apex acuminate. Inflorescence pendulous, terminal, paniculate, 5-7 cm, many flowered. Pedicel ca. 5 mm, slender, glabrous. Sepals 5, light green, ovate-oblong or triangular-oblong, slightly ciliate, apex ± acute. Petals 5, white, oblong or ovate. Stamens 5-8, longer than sepals, very short in pistillate flowers. Disk thick, extrastaminal, slightly pubescent. Ovary white pilose, rudimentary in staminate flowers; style glabrous; stigmas spreading or recurved. Fruit yellowish, glabrous; nutlets ellipsoid, strongly convex, 5-7 mm long, 3-4 mm wide; wing including nutlet 2-3.5 cm long, 1-1.2 cm wide, wings spreading acutely, obtusely, or horizontally.