Botanical name: Gyrocarpus americanus Family: Hernandiaceae (Hernandia family)
Helicopter Tree is a slender, deciduous tree, with smooth, grey bark, often bleaching to a silvery-white on the sunny side. Leaves are spirally arranged, crowded near the ends of branches, up to 15 × 12 cm. Leaves are ovate, often more or less deeply 3-lobed, dark green above, paler greyish below, finely velvety on both surfaces, markedly 3-veined from the base. Veins are yellowish; stalk up to 9 cm long. Flowers arise in compact heads, yellowish-green, with an unpleasant smell. Fruit a woody nut with 2 long thin wings, aiding wind dispersal. It is this winged, flying nut that gave the tree its various common names.
Identification credit: Barry Stock
The flower labeled Helicopter Tree is ...