— 206 — 



Firstly I examined 6 characters. They were the following: 

 The size of the petals. I divided them into 2 classes in 

 proportion to the size of the sepals. (The abbreviations em- 

 ployed are given in brackets): 



Small petals (parv from parvus): The back petals < the 

 back sepal. 



Large petals (gr from grandis): The back petals longer 

 than the back sepal. 



a be 



_^poll 



d e f 



The character of the stigma: 



Without labellum (nib from non labellatus): stigma as 



in the typical Viola arvensis (fig. a). 

 With labellum (lab from labellatus): stigma as in the 



typical V. tricolor with distinct labellum (fig. b). 



