Bulletin No. 23. Agros. 65. 



U, S. DEPARTMENT OF AGRICULTURE, 



DIVISION OF AGROSTOLOGY. 

 [Orass and Forage Plant Investigations.] 



STUDIES 



ON 



AMEKICAN GEASSES. 



A REVISION OF THE NORTH AMERICAN SPECIES OF BROMUS 

 OCCURRING NORTH OF MEXICO. 



BY 



CORNELIUS L. SHEAR, 



A siilsta ut Agroslologist. 



PREPARED l!NDER THE DIRECTION OF F. LAMSON-SCRIBNER, AGROSTOLOGIST. 



ISSUED JULY :i, 1900. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



1900. 



