Common wheat (Triticum aestivum), also known as bread wheat, is a cultivated wheat species. It originated around 8,000 years ago, from the hybridization of an already existing domesticated variety of wheat and the wild goatgrass in the South Caucasus or southwestern Caspian area. About 95% of wheat produced worldwide is this species; it is the most widely grown of all crops and the cereal with the highest monetary yield.