) 
Washington, D.C. 
ALBERT A. HANSEN 
Agronomist in Weed Investigations 
UNITED STATES DEPARTMENT OF AGRICULTURE 
DEPARTMENT CIRCULAR 130 
Contribution from the Bureau of Plant Industry 
( Office of Forage-Crop Investigations ) 
WM. A. TAYLOR, Chief 
| ce. 
THE HAWKWEEDS, OR PAINTBRUSHES — 
October, 1920 
WASHINGTON =} GOVERNMENT PRINTING OFFICE : 1920 
