EXPERIMENT STATION BULLETINS. 



343 



Fig. 106 (98). 



Hedge Mustard. Sisymbrium officinale 

 (L.) Scop. A rather stiff, slender nearly smooth 

 biennial, 30-90 cm. high; leaves pinnatifid; 

 flowers small, yellow; pods narrow, stiff, closely 

 pressed to the stem. Not a vicious but a 

 homely weed. Introduced from Europe. 



Fig. 107. 



Green Tansy Mustard. Sisymbrium in- 

 cisum Engelm. Is causing trouble in the 

 Canadian northwest and may be expected in 

 Michigan. 



