Flowers. Centrifugal evolution, a, fascicle (sweet-william); 

 i, simply forked bouquet (silene) ; c, triply forked bouquet (spurge) ; 

 I, irregular bouquet (bugloss). 



Mixed Evolution. 



In the mixed evolution there are two leading forms, 

 one where the central axis of the plant flowers accord- 

 ing to the centripetal evolution, and the side branches 

 to the centrifugal, which is termed a bunch l , as in the 

 lilac and the butter burr ; and also in the plants whose 

 flowering was formerly termed the whorl a , as in mint, 

 balm, thyme, and sage: and of this there are many 



(1) In Latin, Thyrsus. 



(2) In Latin, Verticillus. 



