. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN No. 1074 3\JsSr<!$iJ,u. &J?><&mfU Washington, D. C. Issued November 8, 1922; revised August, 1923 CLASSIFICATION OF AMERICAN WHEAT VARIETIES. By J. Allen Clark, Agronomist in Charge, John H. Martin, Agronomist, Western Wheat Investigations, and Carleton R. Ball, Cerealist in Charge, Office of Cereal Investigations, Bureau of Plant Industry. CONTENTS. Page. Necessity for a classification of wheat- 1 Previous investigations 2 Foreign classifications 3 American classifications 7 Summary of previo
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN No. 1074 3\JsSr<!$iJ,u. &J?><&mfU Washington, D. C. Issued November 8, 1922; revised August, 1923 CLASSIFICATION OF AMERICAN WHEAT VARIETIES. 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. Necessity for a classification of wheat- 1 Previous investigations 2 Foreign classifications 3 American classifications 7 Summary of previous classifica- tions 9 Present investigations 10 Classification nurseries 11 Preparing descriptions, histories, and distributions 15 Varietal nomenclature 17 The wheat plant 22 Morphological characters 23 Physiological characters 47 Page. Classification of the genus Triticum_ 48 Key to the species or subspecies- 50 Common wheat 50 Club wheat 172 Poulard wheat 180 Durum wheat 183 Emmer 193 Spelt 195 Polish wheat 197 Einkorn 198 Unidentified varieties 199 Estimated acreage of varieties 207 Literature cited 219 Index to varieties and synonyms 231 NECESSITY FOR A CLASSIFICATION OF WHEAT. The varieties of wheat grown in the United States show a great diversity of type. This diversity is natural, as wheat is produced commercially in all of the 48 States of the Union, under a wide range of environmental conditions. More than 200 distinct varieties are grown. Many of these are adapted only locally, while others are well adapted to a wide range of varying conditions. This adapta- tion of a variety is an important factor, as it affects the yield and profitableness of the crop. The choice of varieties for given condi- tion:- and purposes, therefore, usually is given careful consideration by grower-. The choice, however, is dependent upon the determina- tion of identity. 95589°—22—Bull. 1074 1 1. Please note that these images are extracted from scanned page images that may have been d
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