SMITHSONIAN INSTITUTION 
UNITED STATES NATIONAL MUSEUM 
CONTRIBUTIONS 
FROM THE 
UNITED STATES NATIONAL HERBARIUM 
VoLuME XII, Part 3 
TYPES OF AMERICAN GRASSES: 
A STUDY OF THE AMERICAN SPECIES OF GRASSES 
DESCRIBED BY LINNA-US, GRONOVIUS, 
SLOANE, SWARTZ, AND MICHAUX 
By A. S. HITCHCOCK 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1908 
