Among the top ten varieties of iron walnut in Yunnan, toad head, arhat head, also known as iron ball, three ridges, four edges, golden toad lion head, wheat ear lion head, old pimple lion head, ingot lion head, unicorn lion head, scorpion, eagle mouth, half the country, flying butterfly (two conjoined twins), triplet, general arm (general board) and so on.
Juglans yunnanensis, a large deciduous tree. The height of the tree is 10 to 20 meters, and its life span can reach hundreds of years. Distributed in Nujiang, Kunming, Xishuangbanna and Luoping, Yunnan.