120 FEVERFEW. [CHAP. 



as to form a closed tube, within which the pistil 

 lies. They ripen before the pistil, and open on their 

 inner sides, so that the pollen is discharged into the 

 upper end of the tube above the head of the pistil. 

 When the flower opens, the pollen is already ripe, and 

 fills the upper part of the stamen tube. A floret in 

 this condition is represented in (Fig. 87). The pistil, 

 however, continues to elongate, and at length pushes 



FIG. %b. Chrysanthemum partheniurx. 



the pollen against the upper end of the tube, which 

 gives way, and thus the pollen is forced out of 

 the tube, as shown in (Fig 88). The pistil itself 

 terminates in two branches, which at first are pressed 

 closely to one another, and each of which terminates 

 in a brush of hairs (Fig. 89). As the style elongates 

 this brush of hairs sweeps the pollen cleanly out of 

 the tube, and it is then removed by insects. When 



