U.S. Department of Agriculture: Agricultural Research Service, Lincoln, Nebraska


Date of this Version



© Kluwer Academic Publishers 2000

This document is a U.S. government work and is not subject to copyright in the United States.

doi 10.1007/978-1-4615-4353-4_7


Production of all classes of wheat grown in the United States totaled 2.5 billion bushels in 1997. Common wheat, Triticum aestivum L. subsp. aestivum, is the primary source of all wheat varieties grown in the United States, with over 200 varieties known and over 100 varieties cultivated. These 100 varieties constitute over 95% of all wheat cultivated in the United States. Five general wheat classes are predominant in the United States: hard red winter, hard red spring, soft red winter, white, and durum.