Carew, H. John Michigan State University, East Lansing, Michigan.
Papavizas, George C. Institute of Plant Protection, U.S. Department of Agriculture, Beltsville, Maryland.
Last reviewed:January 2021
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A cool-season biennial, Allium cepa, that is cultivated for its edible bulb. The onion is of Asiatic origin and belongs to the plant order Asparagales; it was formerly included in the order Liliales. Related species are leek (A. porrum), garlic (A. sativum), Welsh onion (A. fistulosum), shallot (A. ascalonicum), and chive (A. schoenoprasum). See also: Asparagales; Garlic; Horticultural crops; Liliales
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