Pterocarya macroptera

The Caucasian wingnut tree is in the Juglandaceae family and is native to China (SE Gansu, W Hubei, Shaanxi, Sichuan, Xizang, NW Yunnan, Zhejiang). It grows up to 25 m in height.

• Leaves are odd-pinnate, up to 45 cm long, with 7-13 sessile, elliptic to ovate leaflets up to 21 cm long and 6 cm across.
• Species is monoecious. Flowers in the spring are green male drooping catkins up to 15 cm long and even longer female catkins (up to 60 cm long). By fall, they develop into strings of double–winged nuts, connected pairs in the same plane, wings orbicular-ovate to elliptic, maturing in August to October, turning dry brown over the winter.
• Leaf scars are 'happy face', like other species in the Juglandaceae family.
• Pith is light brown, chambered.