THE BEHAVIOUR OF FLOWERS 163 
nearer the centre the same thing happens; and go on 
toward the centre of the disk, each day the ring of 
opening florets approaching nearer the centre. Finally 
the pistil pushes up its style so that it stands above the 
end of the corolla tube. The style is divided into two 
slender parts which at first are closed up so the pollen 
cannot touch the stigma on the inner surface. Later 

Fic. 200. Heads of fuller’s teasel in different stages of flowering. 
the parts curve outward. When the head has partly 
blossomed you can see a broad ring of disk flowers, next 
the rays, with the pistils projecting above the corolla 
tube. Next there is a broad ring of disk flowers with 
the pollen projecting above the corolla tube, and in the 
centre of the head are disk flowers not yet opened. 
If you observe the flowers in the garden, you will see 
that bees and other insects are crawling over them. 


