Barley
Barley, common name for any of a genus of cereal grass, native to Asia and Ethiopia, and one of the most ancient of cultivated plants (see Grasses ). Its cultivation is mentioned in the Bible, and it was grown by the ancient Egyptians, Greeks, Romans, and Chinese. It is now the fourth largest grain crop, after wheat, rice, and corn. In the United States and Canada, as well as in the greater portion of Europe, barley is sown in the spring. Along the Mediterranean Sea and in parts of California and Arizona, it is sown in the fall. It is also grown as a winter annual in the southern United States. Drought resistant and hardy, barley can be grown on marginal cropland; salt-resistant strains are being developed to increase its usefulness in coastal regions. Barley germinates at about the same temperature as wheat. The different cultivated varieties of barley belong to three distinct types: two-rowed barley, six-rowed barley, and irregular barley. The varieties grown in the United States ar