DESCRIPTIVE MANUAL 



159 



Distribution. — This weed is common in the northern states and 

 extends across the continent. It is abundtot in Iowa, at times, in 

 waste places and vacant lots; apparently, however, it is less com- 

 mon than common charlock. 



Extermvnation. — This weed can he exterminated by the same 

 method that is used with common charlock. 



Rocket {Eruca sativa L.). 



Description. — ^An annual or biennial herb with stout, 4-sided 

 stem; lower leaves lyrate, incised or pinnatifid, upper leaves. 



Fig. 90. 



Rocket (Eruca sativa). Introduced with alfalfa seed. 

 (Drawn by F. C. Collins.) 



