26 



CHR YSANTHEMUM. 



[CHAP. 



the pollen is pushed out (Fig. 21). Any insect then 

 alighting on the flower would carry off some of the 

 pollen adhering to its under side. The upper part of 

 the pistil terminates in two branches (Fig. 22, st], 

 each of which bears a little brush of hairs. These 

 hairs serve to brush the pollen out of the tube ; while 



FIG. 21. 



FIG. 20. Floret of Chrysanthemum #ar//ienium, just opened, X 20. 

 FIG. 21. Ditto, somewhat more advanced. 

 FIG. 22. Ditto, with the stigmas expanded. 



in the tube the two branches are pressed close to- 

 gether, but at a later stage they separate, and thus 

 expose the stigmatic surfaces (Fig. 21), on which an 

 insect, coming from a younger flower, could hardly 

 fail to deposit some pollen. The two stigmas in the 

 ray florets of Parthenium have no brush of hairs ', 



