Iron Walnut
Juglans sigillata Dode

Juglans sigillata, known as Iron Walnut, is a tree in the Juglandaceae family native to the eastern Himalayas and western China. It is cultivated for its edible walnuts, with over 80 approved cultivars developed using grafting technology.
Description
Juglans sigillata is a species of walnut tree in the Juglandaceae family, found in the eastern Himalayas and western China. It is valued for its edible nuts and has been cultivated using grafting techniques, resulting in the development of at least 80 approved cultivars.
Other common names
Iron Walnut
Distribution
China South-Central · East Himalaya · Tibet