Crimson bean, alias: red bean, red rice bean, rice bean, protein bean, red hill bean, Latin name: Vigna umbellata (Thunb.) Ohwi et Ohashi is an annual herb of the family Leguminosae and the genus cowpea. Cowpea is an annual herb in the family Leguminosae. The stems are slender, up to 1 m long or more, yellow villous when young, glabrous when old. The shape is similar to that of the red bean but slightly elongated. Annual herbs, red beans are mainly used in traditional Chinese medicine, often mixed with red beans, with the effect of diuretic swelling, detoxification and drainage of pus. It is widely cultivated throughout the country. Red beans can be eaten whole, or used to cook rice, porridge, make red bean soup. Commonly used to make bean paste as a filling, delicious.