Castor is an annual or perennial herb of Euphorbiaceae. The whole plant is smooth and covered with wax powder, generally green, blue-gray or purple; The stem is round and hollow, with branches; Leaves alternate, palmately divided; Panicle, unisexual, apetalous, female flowers inserted in the upper part of the inflorescence, red style, male peanuts in the lower part of the inflorescence, pale yellow; Capsule with or without thorns; Oval seed with hard and shiny seed coat with black, white and brown stripes. Like high temperature, frost resistance, strong acid-base adaptability. The seeds are called castor seeds, and the extracted oil is called castor oil, which is used as laxative in medicine and lubricating oil in industry. ?

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