MICHIGAN WEEDS. 



439 



Fig. 239 (208). 



Field Sow Thistle. Sonchus arvensis L. Chiefly smooth, a coarse weed, juice 

 milky, 60-120 cm. high; spreading bj' rcot?tocks; leaves variously lobed, spiny- 

 tootned; flowers yellow. Introduced from Europe and a rampant weed. 



