REPRODUCTIVE ORGANS 



115 



Fig. 115. A wi: 



sjiores called pollen 

 and occasionally 

 falling upon the 

 right spot for 

 germination. 

 With such an 

 agent of transfer 

 the pollen must 

 be Ycry light and 

 p w d e r )' , a n d 

 also very abun- 

 dant, for it must 

 come down al- 

 most like rain to be 



1 seed of Bignonia.— After Stkasbubger. 



grains being scattered by the wind. 



Fig. 117. Winged fruit of Pte/ea.— Alter 

 Kerner. 



Fig. 116, Winged I luit of maple.— After Keener. 



certain of reaching the right places. 

 Among the g y m n o - 

 sperms (pines, hem- 

 locks, etc.) this is the 

 exclusive method of 

 pollination, and when a 

 pine forest is shedding 

 pollen the air is full of 

 the spores, which may 

 be carried to a great 

 distance before being 

 deposited. Occasional 



