Common name: Black walnut, eastern black walnut, American walnut
Scientific name: Juglans nigra
Chinese name: 黑核桃，东部黑核桃
Introduction：
Juglans nigra is a deciduous tree native to eastern north America and found to grow as far north as southern Minnesota, southern Wisconsin, southern Michigan, and southern Ontario. It can grow to a height of 38 m and develops a long, smooth trunk and a small rounded crown when growing in the forest. Its wood is heavy, strong, and highly resistant to shock. The finished wood product takes on a smooth velvety surface and a handsome grain pattern. The nuts of black walnut are used as food by humans and are harvested commercially. This species is also cultivated as an ornamental.
