UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 1021 



Contribution from the Bureau of Plant Industry 

 „ WM. A. TAYLOR, Chief 



Washington, D. C. 



PROFESSIONAL PAPER 



April 17, 1922 



GROUP CLASSIFICATION AND 



VARIETAL DESCRIPTIONS OF AMERICAN 



VARIETIES OF SWEET POTATOES 



By 



H. C. THOMPSON, formerly Horticulturist, and JAMES H. 



BEATTIE, Horticulturist, Office of Horticultural 



and Pomological Investigations 



CONTENTS 



Page 

 Importance of Varietal Classification of 



Sweet Potatoes ". 1 



Early Attempts at Classification .... 2 



Proposed System of Classification . . . 4 



Key to the Groups . . . ■ 6 



Descriptions of the Groups 6 



List of Varieties Included in the Key . 11 



Descriptions of Varieties 11 



Check List of Names Used in Sweet- 

 Potato Literature 18 



Bibliography of Sweet-Potato Litera- 

 ture 26 



WASHINGTON 

 GOVERNMENT PRINTING OFFICE 



1922 



