U.S. DEPARTMENT OF AGRICULTURE. 



DIVISION OF BOTANY. 



ILLUSTRATIONS OF NORTH AMERICAN GRASSES. 



VOL. I. 



GRASSES OF THE SOUTHWEST. 



PLATES AND DESCRIPTIONS 



OF THE 



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

 ARIZONA, AND SOUTHERN CALIFORNIA. 



By Dr. GEO. VASEY, 



BOTANIST, DEPARTMENT OP AGRICULTURE. 



PUBLISHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURE. 



WASHINGTON : 



GOVERNMENT PRINTING OFFICE. 



1891. 



