182 



Kraemer: Morphology of the Genus Viola 



This group may be further subdivided according to the width of 

 spur at its widest portion into : 



(a) Spur .7 to .8 mm. wide at the widest portion : 



J>. arcnaria 



(Fig. 20), V. Lahradorica (Fig. 21), V. striata (Fig. 22) and V. 

 ScUdrkii (Fig. 23). 



87 



(J)) Spur 1.5 to 1.8 mm. wide at its widest portion: 



p]ii)iifolia (Fig. 24), V. 

 V. palmata (Fig. 27), 

 29). 



(Fig. 25), I 

 ta (Fig. 28) 



(F 



V. dd- 



:• 26), 



I 



E. In V. rostrata (Fig. 30) the length of spur is about 9 mm. 

 It will be seen that we have in this consideration the grouping 

 of species of the genus into a number of natural groups which 



