Peanut, formerly known as Arachis hypogaea Linn., is a kind of nut with abundant yield and widely edible in China, also known as "evergreen fruit" and "mud bean".
Peanut is an important oil crop with many varieties.
According to the shape and skin color of peanut pod and seed, it can be divided into four categories.
Common type is commonly known as big peanut. The pods are thick, smooth veins, cocoon like and without keel. The grains are mostly oval. Common peanut is the main cultivar in China.
The shell of bee waist type pod is very thin, with obvious veins and keel. There are more than three seeds in the pod, and occasionally there are double seeds. The seed coat is dull and lusterless.
There are many seeds in the pod of polygonal type, which are beaded. Thick shell and smooth veins. The seed coat is mostly red and sometimes white.
In Pearl bean type, the shell is thin, the pod is small, generally has two seeds, and the kernel rate is high. The seed grains are plump, most of them are pick shaped, and the seed coat is mostly white.
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