Bulletin No. 21. 



• Agros. 61. 



U. S. DEPARTMENT OF AGRICULTURE. 



DIVISION OP^ AGROSTOLOGY. 

 [Orass and Forntje Plant Invesli&iaiions.] 



STUDIES 



ON 



AMERICAN GRASSES 



THE NORTH AMERICAN SPECIES 

 OF CHiETOCHLOA. 



BV 



F. LAMSON-SCRIBNER and ELMER D. MERRILL. 



ISSXJED ]Vr^RCH[ 8, 1900. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 

 19-00. 



