68 



PHILOSOPHICAL NOTES ON 



Achillea, simply by fusion after fusion through countless 

 generations. 



Fig. 1 shows two capitula of Pyrethrum fused only by their 

 peduncles, the flower heads remaining separate. Each of the 

 disks has a dimple in its centre. 



[r 



rig. 1. Incomplete fusion of two circular Pyrethrums (shown in plan). 



Fig. 2 shows the complete fusion of two capitula; 'with the 

 ray florets irregularly disposed, and the disk florets fused into an 

 oblong mass. The line in the middle indicates a depression 

 between the two dimples. 



Pig. 2. Complete fusion of two heads, producing an oval disk (shown in 



plan). 



