U. S. DEPARTMENT OF AGRICULTURE 



DIVISION OF BOTANY. 



BULLETIN No. 12. 



GRASSES OF THE SODTIIWEST, 



PLATES AND DESCRIPTIONS 



GRASSES OF THE DESERT REGION OF WESTERN TEXAS, NEW MEXICO, 

 ARIZONA,. AND SOUTHERN CALIFORNIA. 



Part I. 



By DR. GEO. VASEY, 



BOTANIST, DEPARTMENT OF AGRICULTURE. 



ISSUED ,*5CT<MH&ft ,f $,i 



PUBLISHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURE. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE 



1890. 



