The monoecious (or bisexual) yellow-green flowers are produced after the leaves in early summer, in May or June in the British Isles, on pendulous panicles long with about 60–100 flowers on each stalk. The fruits are paired winged seeds or samaras, the seeds in diameter, each with a wing long developed as an extension of the ovary wall. The wings are held at about right angles to each other, distinguishing them from those of "A. platanoides" and "A. campestre", in which the wings are almost opposite, and from those of "A. saccharum", in which they are almost parallel. When shed, the wing of the samara catches the wind and rotates the fruit as it falls, slowing its descent and enabling the wind to disperse it further from the parent tree. The seeds are mature in autumn about four months after pollination.