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 H. D. Wilson and C. B. Heiser, "The Origin and Evolutionary Relationshipos of 'Huauzontle' (Chenopodium nuttalliae Staffor), Domesticated Chenopod of Mexico," American Journal of Botany 66 (1979): 198-206; and Norman W. Simmonds, "The Grain Chenopods of the Tropical American Highlands," Economic Botany 19 (1965): 223-35; a related grain was used in Europe and Asia.