Most studies of the Columbian Exchange have not appreciated the significance of Africans in establishing plant domesticates in the Americas. African plants traversed the Atlantic as provisions aboard slave ships and slaves proved instrumental in their establishment in the New World as preferred food staples. This paper identifies the diverse crops domesticated in Africa, the intercontinental plant exchanges between Africa and Asia that occurred in the millennia before the Columbian Exchange and the role of African indigenous knowledge in establishing rice in the Americas.
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Judith Carney (2001) studied this question.