Yams are a tropical-vine tuber that is popular in South and Central America, parts of Asia and Africa and in the West Indies. Sweet potatoes and Yams or simular in many ways and therefore are often confused with one another. They are in fact two different species of plants. Here in the US
sweet potatoes are often called Yams and to add even more confusion, sweet potatoes that are canned are often labeled as "Yams". True yams are rarely marketed in the U.S. and are seldom grown.
Yams are somewhat sweeter than the sweet potato but are lower in some vitamins. There are several varieties of sweet potatoes grown. Beauregard, Porta Rican, Centennial, Jewel, and Vardaman are a few. You might find a true Yam in Latin American Markets...
Hope this helps
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