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Wild sweet-potatoes are closely related to supermarket sweet potatoes.  The tuber can be up to 30 inches long, 5 inches thick and weigh about 20 pounds.  They're said to be tasty, but bitter if too big.  They were a staple of the American Indian diet.  The root also has been used medically as an infusion and may have laxative effects, or as a poultice used for rheumatism.