FLORAL MECHANISMS 



99 



the varied tips of the rays of daisies and sun- 

 flowers. 



LION'S-FOOT 



In the Composite family there are various com- 

 binations of tubular flowers and ray flowers; the 

 latter are often pistillate only, as in the common 

 daisy, but often without stamens or pistils, as in 

 the Black-eyed Susan. The ray flowers put forth 

 their banners in order to attract the insects to alight 

 upon them, then crawl over the flower-head and 

 scatter pollen of the upper flowers downward upon 

 the waiting stigmas, thus insuring cross-fertilisation 

 within the flower colony, or taking some away to 

 the next flower visited. 



The arrangement of the Composites has the fol- 

 lowing in its favour: 



