240 



IOWA ACADEMY OF SCIENCE Vol. XXVI, 1913 



the majority of authors now accept it as the true name for what by 

 many American bontanists has been called var. inte grata of L. scari- 

 ola, and the author of this paper considers this the best diposition to 



Pig. 83. — ^Akenes of Lactuca. 



make of the plant. In the second edition of the Illustrated Flora, L. 

 scariola is reduced to a synonym of the older Linnaean species. 

 However, in this paper L. scariola is retained as a distinct species, 

 althons^h it nii^lit well be considered as only a variety of virosa. 



