164 WEED FLORA OF IOWA 



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



Description. — A slender, erect annual or winter annual, l 1 /^ 1 /^ 

 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. 



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

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



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



and waste places. 

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



