50 











45 



40 







X 



X 



35 





30 



o 



o 



25 



o 



X 



20 



o 



X 



X 



X 

 X 



15 



E 



3 



10 



A 



AX 

 A 

 A 

 X 

 A 



Ax 



AX 



X 

 X 



A 



A 



A 

 X 



X 



AX 



A 

 X 



X 

 XX 

 X 

 X 

 X 



* 

 X 



Length 



13 

 of 



16 

 corolla, mm. 



21 



Fig. 1. Overlapping range of variation of three intersterile species of 

 Leafj stemmed Gilia with respect to two important diagnostic characters. 

 Each dot represents the average characteristics of a single local population. 

 • (.'. capitata abrotanifolia, X G. achiUcacfoJia, A Q. angelensis. From 



Evolution, 7 (1953) 



48 



