(inflorescence) is indicative of the species (see table below). The male flower has 3-8 stamens; the female has a superior ovary with 3-7 carpels. Plane trees are wind-pollinated. Male flower-heads fall off after shedding their pollen.

After being pollinated, the female flowers become achenes that form an aggregate ball. The fruit is a multiple of achenes (plant systematics, Simpson M. G., 2006). Typically,