Flowering April - June. Deciduous. Introduced.
Drooping panicles of yellowish-green flowers followed by hairless, winged fruit. Self-seeds prolifically. Large 5-lobed leaves, lobes coarse-toothed. Smooth grey bark. Fast-growing, height to 30m.
Abundant in woods, hedges and on waste ground. Naturalised in wide range of habitats, can be invasive.