A primitive tree native to Asia, this tree has distinctive fan-shaped leaves with parallel veins and a notch in the tip. Male and female flowers are borne on separate trees. The sexual system is controlled by X and Y chromosomes, common in animals but rare in plants. Male trees are usually planted because fruits produced by females are reported to smell like rancid butter. The leaves turn golden yellow in the fall and often fall in a single day if the tree is not protected by a building.