The Peanut (Arachis hypogaea) belongs Fabaceae (the Pea family). It is an annual herb that is native to tropical South America. This herb was introduced into Japan in the early Edo Era (1603-1868). Now a days, it is mainly cultivated in Chiba, Ibaraki and Kanagawa prefecture of Japan. It can reach 20-50 cm in height. The yellow papilionaceous flowers come in June to September. Following bloom, the tip of ovary elongates downward and bearing under ground. There are 3 types of growing, such as bush-type, hemibush-type and creeping-type.