Bulletin No. 23. Agros. 65. 



U, S. DEPARTMENT OF AGRICULTURE, 



DIVISION OF AGROSTOLOCtY. 

 [Grass and Fora^^laut luvesta^tions.] 



ON 



AMEEICAN aEASSES. 



A REVISION OF THE NORTH AMERICAN SPECIES OF BROMUS 

 OCCURRING NORTH OF MEXICO. 



BY 



CORNELIUS L. SHEAR, 



Assistant Aijroslologist. 



PREPARED UNDER THE DIRECTION OP F. LAMSON-SCRIBNER, AGROSTOLOGIST. 



ISSXJED JXTLY 3, 1900. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 

 1900. 



