Pterocarya fraxinifolia, also known as the Caucasian wingnut or Caucasian walnut, is a species of tree native to the Caucasus region, Iran, and Turkey. It is characterized by its distinctive winged fruits and feathery leaves. While this tree is commonly referred to by its scientific name, there are several synonyms that can be used to describe it. Some of these synonyms include Pterocarya bicolor, Engelhardia fraxinifolia, and Juglans pterocarya. No matter what it is called, this beautiful tree provides excellent shade and adds a unique touch to any landscape.