Trees up to 20 m tall. Bark dark brown, rather smooth. Twigs glabrous, often glaucous. Bud scales appressed, pubescent. Leaves deciduous, 5-15 cm across, 5-7-lobed; lobes acuminate, sinuses rounded, margins entire; base subcordate-truncate, glabrous except nerve axils, bearded beneath. Petioles slender, 3-15 cm long, glabrous. Flowers 5-merous, 6-8 mm across, yellow-green. Sepals oblong, 3-4 mm long. Petals spathulate, 3-4 mm long. Stamens 8, included, inserted on disc. Ovary glabrous; styles 2, free. Samaras compressed, glabrous, 2-4 cm long, divaricate to subhorizontal, the back sigmoid or arcuate; nutlets compressed.