Walnut is the most widespread tree in genus walnut ( Juglans) of walnut family ( Juglandaceas). It is a kind of woody and grain plant which mainly produces kernels and itis also an important plant for economics, commercial timber and greening. 核桃属胡桃科(Juglandaceae)核桃属(Juglans)植物,是我国栽培较为广泛以果仁为主要产品的树种之一,也是经济、用材和四旁绿化的多用途重要树种。