Cyperus esculentus (also called chufa sedge, nut grass, yellow nutsedge, tiger nut sedge, or earth almond) is a crop of the sedge family widespread across much of the world. It is found in most of the Western Hemisphere, as well as Southern Europe, Africa, Madagascar, the Middle East, and the Indian subcontinent. Historically it has become naturalized in many other regions, including Ukraine, China, Hawaii, Indochina, New Guinea, Java, New South Wales, and various oceanic islands. (source)