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 is that the rural varieties preserve the Classical Arabic (CA) interdentals ث and ذ, and merge the CA emphatic sounds ض and ظ into rather than sedentary . The most significant differences between rural Arabic and non-rural Arabic are in syntax. The sedentary varieties in particular share a number of common innovations from CA. This has led to the suggestion, first articulated by Charles Ferguson, that a simplified koiné language developed in the army staging camps in Iraq, from whence the remaining parts of the modern Arab world were conquered. In general the rural varieties are more conservative than the