1, Carya cathayensis, produced in natural environment with lush vegetation such as Changbai Mountain in Jilin and Xing 'an Forest in Heilongjiang, is a pure wild fruit;

2. Carya cathayensis is a deciduous tree, 3 to 5 meters high, with grayish white bark, shallow longitudinal crack, flaky pith of branches, and fine hairs at the tips of young branches;

3. The pinnate compound leaves are 25 cm to 50 cm long, with 5 to 9 leaflets, rare 13, oval to oval, and the terminal leaflets are usually larger, with a length of 5 cm to 15 cm and a width of 3 cm to 6 cm. The apex is acute or tapering, the base is round or wedge-shaped, sometimes heart-shaped, the whole edge or with inconspicuous blunt teeth.