U. S. DEPARTMENT OF AGRICULTURE. 



DIVISION OF BOTANY. 



BULLETIN No. 12. 



GRASSES OF THE SOUTHWEST. 



PLATES AND DESCRIPTIONS 



OF THE 



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

 ARIZONA, AND SOUTHERN CALIFORNIA. 



Part I. 



By Dr. GEO. VASET, 



BOTANIST, DEPARTMENT OF AGRICULTURE. 



ISSUED OCTOBER 13, 1890. 



PUBLISHED BY AUTHORITY OF THE SECRETARY OP AGRIOULTURE. 



WASHINGTON : 



GOVERNMENT PRINTING OFFICE. 

 1890. 



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