Pterocarya fraxinifolia

Pterocarya fraxinifolia (Caucasian wingnut) is a species of flowering tree in the Juglandaceae family. It is endemic to Armenia, Azerbaijan, Georgia, Iran, Russia, and Turkey. It was introduced to France in 1784, and the United Kingdom after the 1800th century.

Description
It is a deciduous tree, growing between 65-100 ft (20-30 m) tall. The bark is pale gray in color, and furrows with age. The leaves are alternate or pinnate. It is dioecious, with male and female flowers on the same plant. The male flowers are axillary pendulous catkins, while the female flowers are long and pendulous catkins. The fruit is a nut that bears two wings.

Book sources

 * Trees, pg. 266