UNITED STATES DEPARTMENT Of Jh.RK HI/HIRE 
BULLETIN No. lojl 
nr 
Contribution from the Bureau of Phuit Iiduitrj 
WM. A. TAYLOR. Chll f 
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 Pomoiogical Investigations 
CONTENTS 
I 'age 
Importance of Varietal Classification of 
Sweet Potatoes 
Early Attempts at Classification .... 
Proposed System of Classification . . . 
Key to the Groups 
Descriptions of the Groups 
List of Varieties Included in the Key 
I Descriptions of Varieties 
Pftff 
11 
II 
Check List of Names Used in Sweet- 
Potato Literature II 
Bibliography of Sweet-Potato Litera- 
ture . . 2fi 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
