DESCRIPTIVE MANUAL 



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165 



Fig. 92-A. Distribution of Hedge Mustard. 



Chemical Composition. — According to the University of Minne- 

 sota it is as follows :* 



Tumbling Mustard {Sisymbrium altissimum L.). 



Description. — A leafy, branched annual from 1-4 ft. high, lower 

 leaves runcinate, pinnatifid, irregularly toothed, or wavy margined, 

 upper leaves smaller, threadlike. 



Distribution. — This weed is native to east Europe. It has become 

 widely scattered in the northern states, particularly in the west from • 

 Minnesota to Washington and in Canada. It is widely scattered in 

 Iowa in the vicinity of railroad watering tanks, elevators and stock- 

 yards. It is less common in the southern half of the state. 



Extermination. — The young mustard plants are easily killed by 

 cultivation. They are likely to occur in some commercial seed like 

 timothy, therefore, sow only clean seed. 



•Snyder: Bull. Minn. Agr. Exp. Sta., 101. 



