434 



EXPERIMENT STATION BULLETIN. 



Fig. 233 (204). 



Wild or Tall Lettuce. Lactuca canadensis 

 L. A smooth, leafy biennial, 1-3 m. or more 

 high, juice milky leaves more or less lobed or 

 simple, some of them 30 cm. long; heads 1-1.5 

 cm. long, numerous, in a large open panicle; 

 flowers yellow. 



Fig. 234 (205.) 



Prickly Lettuce. Lactuca Scariola L. 

 Biennial, erect, stiff, leafy, smooth, except near 

 the base, juice milky, 60-200 cm. high; leaves 

 narrow with spinulose margins, base more or 

 less clasping, tending in open places to turn 

 one edge up, the other down, and to point north 

 and south; flowers pale yellow. A trouble- 

 some weed introduced from Europe. 



