164 WEED FLORA OP IOWA 



Hedge Mustard {Sisymbrium officinale (L.) Scop.)- 



Description. — ^A slender, erect annual or winter annual, l%-2^ 

 ft. high ; lower leaves divided, upper entire or hastate at base ; flow- 

 ers small, yellow, borne in spikelike racemes; seeds small, brown; 

 cotyledons incumbent. 



Distribution. — Found everywhere in the state, notably in Story, 

 Boone, Polk, Clinton, Linn, Marshall, Hardin, Black Hawk, Wood- 

 bury, Pottawattamie, Carroll, Jasper, Monroe, Scott, Lee, and Alla- 

 makee counties. 



Exterminaition. — Easily exterminated by cultivation ; also by us- 

 ing the formula 100 pounds of iron sulphate to one barrel of water. 



Fig. 92. Hedge Mustard ISisymbrium officinale). Common in gardens, fields 



and waste places. 

 (General aspect of plant photographed by Hart. Drawing by Charlotte M. King.) 



