174 WILD FLOWER PRESERVATION 



wind-fertilized plants are in separate flowers. 

 Those bearing stamens are called staminate or 

 male flowers, those bearing the pistils, pistil- 

 late or female. 



Some plants (known as monoecious) bear 

 male and female flowers on the same indi- 

 vidual. 



Others (dioecious) bear male and female 

 flowers on separate individuals, some plants 

 of a species being entirely male and others en- 

 tirely female. (91, A and B) 



Some wind-fertilized flowers are visited by 

 insects because of their abundant pollen, but 

 these visitors to the male flowers seldom effect 

 fertilization, as the female flowers are too in- 

 significant to attract their attention. 



DEVICES FOR PREVENTING SELF-FERTILIZATION". 



Flowers that require crossing before good 

 seed can be set have many devices for prevent- 

 ing, or lessening the chance of their pistils be- 

 ing fertilized by the surrounding stamens. 



In some cases the flower's own pollen is ab- 

 solutely ineffectual when it does fall upon the 

 stigma. In others the stigma and stamens are 



