Dioecious tree up to 20 m. Leaves trifoliolate or pinnate, leaflets 3-5, serrate and often lobed. Flowers pendulous, apetalous, disc 0. Samaras divaricate; nutlets oblong, flattened. Fl. early spring. Widely planted as an ornamental, and possibly naturalised in N. Turkey.
N. America; planted or naturalised elsewhere.