Yam (vegetable) Yam (vegetable) Yam is the common name for some plant species in the genus "Dioscorea" (family Dioscoreaceae) that form edible tubers. Yams are perennial herbaceous vines cultivated for the consumption of their starchy tubers in many temperate and tropical world regions. The tubers themselves are also called "yams", having numerous cultivars and related species. In parts of the United States and Canada, "yam" is sometimes used to refer to varieties of the unrelated sweet potato ("Ipomoea batatas"). The name, yam, appears to derive from Portuguese "inhame" or Canarian (Spain) "ñame", which derived from West African languages during trade. The main
Varieties of Arabic In some regions, particularly around the southern Sudan, the pidgins have creolized (see the list below). Even within countries where the official language is Arabic, different varieties of Arabic are spoken. For example, within Syria, the Arabic spoken in Homs is recognized as different from the Arabic spoken in Damascus, but both are considered to be varieties of "Levantine" Arabic. And within Morocco, the Arabic of the city of Fes is considered different from the Arabic spoken elsewhere in the country. Another way that varieties of Arabic differ is that some are formal and others are colloquial (that is, vernacular).