UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 1074 
Washington, D. C. Issued November 8, 1922; revised August, 1923 » 
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CLASSIFICATION OF AMERICAN 
WHEAT VARIETIES 
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By 
J. ALLEN CLARK, Agronomist in Charge, JOHN H. MARTIN, 
Agronomist, Western Wheat Investigations, and CARLETON 
R. BALL, Cerealist in Charge, Office of Cereal Investigations, 
Bureau of Plant Industry 
CONTENTS 
Page Laas Page 
bin Necessity for a Classification of Wheat. 1 | Classification of the Genus Triticum .. 48 
} Previous Investigations Key to the Species or Subspecies .. 50 
Foreign Classifications Common Wheat 
American Classifications 
Summary of Previous Classifications . 
Present Investigations 
Classification Nurseries 
Preparing Descriptions, Histories, and 
Distributions. .......-+.4.-s. 
Varietal Nomenclature 
jai The Wheat Plant Estimated Acreage of Varieties 
4, Morphological Characters Literature Cited 
Physiological Characters Index to Varieties and Synonyms... . 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1922 
