COMPOS IT. F- 



631 



wild in Europe. Canary Isles, Madeira, Algeria, Abyssinia, 

 and Eastern Asia, and has also become naturalized in the 



Fk;. 2.S7. ^-Cos lettuce, var. romana. (Aflrr Corhcll.) 



liiiled States, where it is often a troublesome weed. In 

 this eountrv, L. scariola is distributed from New York to 



Fig. .'sS.-Hcad Ictlucc, var. capitata. {After Corlnil.) 



Minnesota and Missouri. The close relation.ship between 

 /.. saliva and/., scariola is shown by the fact that they readily 

 cross. 



