U. S. DEPARTMENT OF AGRICU PURE. 



DIVISION OF BOTANY. 



BULLETIN No. 12. 



GRASSES OF THE SOUTHWEST. 



PLATES AND DESCRIPTIONS 



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

 ARIZONA, AND SOUTHERN CALIFORNIA. 



Part II. 



By Dr. GEO. VASBY, 



BOTANIST, DEPARTMENT OF AGRICULTURE. 



ISSUED DECEMBER, 1891. 



PUBLISHED BY AUTHORITY OF THE SECRETARY OP AGRICULTURE. 



WASHINGTON : 



GOVERNMENT PRINTING OFFICE. 



1891, 



