TAXONOMIC PRINCIPLES 



21 



D. tofulosa 

 I 

 D. lichlanqe'nsis 



» /'- • 



D. macrocapnos 



' 'A 



J. paucinerva 



15 14 13 12 11 10 9 



1 12 13 14 15 



Fig. 2-4. Graph based on specialization indices indicating the 

 probable phylogeny of Dicentra. Upper left: Subgenus Dactyli- 

 capnos. Lower left: Subgenus Chrysocapnos. Right: Subgenus 

 Dicentra. Higher values indicate a greater degree of specialization 

 (Stern, 1961). 



MORPHOLOGICAL SPECIALIZATION 



chrysantha scandens 



chrysantha scandens 



Fig. 2-5. Two possible phyletic interpretations of portions of the 

 diagram shown in Fig. 2.4. 



