dateline Opelousas

Sweet potatoes aren't really yams; yams, which belong to the genus Dioscorea, are grown widely in Africa, where they originated, and elsewhere in the tropics but scarcely at all in the United States. What we are dealing with here is Ipomoea batatas, which is not only not a yam but not a true potato. Believed to be a native of Central America, it is closely related to the morning glory, with the same purplish, heart-shaped leaves. Sweet potatoes, which are less dense and starchy than yams, are rich in healthful beta carotene, an important source of vitamin A.