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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Yam is the common name for some species in the genus Dioscorea (family Dioscoreaceae). These are perennial herbaceous vines cultivated for the consumption of their starchy tubers in Africa, Asia, Latin America and Oceania. There are many cultivars of yam. The sweet potato has traditionally been referred to as a yam in parts of the United States and Canada, but it is not part of the Dioscoreaceae family. Although it is unclear which came first, the word yam is related to Portuguese inhame or Spanish ñame, which both ultimately derive from the Wolof word nyam, meaning "to sample" or "taste"; in other African languages it can also mean "to eat", e.g. yamyam and doya in Hausa. There are over 100 tribes and dialect in Nigeria, and each has different language names for Yam, "Isu" is the Yoruba translation or "Iyan" when it has been prepared to be consumed as amain course for dinner.