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Pterocarya fraxinifolia
Caucasian wingnut

Caucasian wingnut (Pterocarya fraxinifolia) is a fast-growing, medium-sized deciduous tree native to the Caucasus region, from northern Iran to Ukraine. It is characterized by its hanging, compound leaves and long catkins, up to 50 cm.

The tree is mainly used as an ornamental in parks and urban gardens. Studies show the wood of the tree is rather weak, but comparable with other hardwood species, and also suitable to use for plywood. However, the wood is not of commercial significance today, apart from its occasional use for producing matches. The bast from the bark is also used for weaving hats.

Caucasian wingnut grows in moist, loamy and clay soils, usually on flat sites near open waters, particularly in river valleys near the Caspian Sea. Despite this preferred habitat, the tree is a drought-tolerant species. It cannot grow in the shade and prefers full sun, but is able to grow in hard and compacted soils.

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