Published 1986
Also
What we in the United States call a yam is actually a sweet potato, a misnomer that has existed since slaves arrived and used a word like yam to designate the American vegetable. Yams grown by Africans do very superficially resemble sweet potatoes (which are part of another family; see Boniato). No one outside the United States calls sweet potatoes “yams,” and anyone who wishes to continue doing so should know that the majority is overwhelming: 25 million tons of yams are produced annually, by most countries in the tropics and subtropics, making them one of the most important food crops in the world.
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