Issued February 20. 1911. 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF PLANT INDUSTRY— Circular No. 73. 

 B. T. GALLOWAY, Chief of Bureau. 



THE DISTINGUISHING CHARACTERS OF THE 



SEEDS OF QUACK-GRASS AND OF 



CERTAIN WHEAT-GRASSES. 



LIBRARY 

 NEW YORK 



*»«>tanical 



BY 



F. H. HILOIAX, 

 Assistant Botanist, Seed Laboratory. 



gg3Qgo 11 WASHINGTON : GOVERNMENT PRINTING OFFICE : 191) 



