Sycamore maple tree

The sycamore fruit is a double samara with a spherical nut and wings set at a slightly acute angle.

An excerpt from the article 19 facts about Sycamore maple tree
The wings are 3 - 5 cm (1,18 - 1,96 in) long and fall apart when ripe. The sycamore bears fruit abundantly every other year, with the fruit ripening between September and October.