Physostigma

Pterocarya stenoptera: Chinese Wingnut Pterocarya stenoptera: Chinese Wingnut- Fact sheet about this tree, including a photo. Pterocarya stenoptera Pterocarya stenoptera- Article from Wikipedia with photographs and description of the Chinese wingnut tree. Pterocarya fraxinifolia: Caucasian Wingnut Pterocarya fraxinifolia: Caucasian Wingnut- Photos to aid in identifying this tree by its leaves, bark, and other characteristics.