UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 622 
Contribution from the Bureaa of Plant Indostrj 
WM. A. TAYLOR, Chief 
Washington, D. C. 
PROFESSIONAL PAPER 
February 2, 1918 
THE IDENTIFICATION OF VARIETIES 
OF BARLEY 
HARRY V. HARLAN, Agronomist in Charge of Barley 
InTestigations, Office of Cereal Investigations 
CONTENTS 
Page 
VarieUes of Barley 1 
Review of the Literature 3 
Variable Factors in CultiTated Barley . . 5 
Scheme of Classification 8 
Lines for Further Study 25 
IdeatificaUon of Thrashed Material . . 26 
Varieties Grown In Field Culture in the 
United States . 28 
,Eey to Commercial Varieties 28 
Summary 30 
Literature Cited . 31 
WASHINGTON 
GOTEBNMENT PRINTING OFFICE 
1918 
