GLOSSARY OF BOTANICAL TERMS 171 



Tiny flowers fertilized by insects are gener- 

 ally massed together to attract greater atten- 

 tion. 



The shape of the corolla frequently has much 

 to do with its fertilization and in some cases 

 this is specialized to such an extent that 

 certain flowers can only be fertilized by certain 

 insects, and a dearth of these would bring about 

 a corresponding dearth of the flowers. 



Some corollas are open to the sky and very 

 easy of access. (80) 



Others, growing from the sides of stems in a 

 more or less dense cluster, have developed a 

 large lower petal. This protrudes so as to 

 form a convenient alighting platform for in- 

 sects in search of honey in the throat of the 

 flower. The upper petal forms a hood over 

 the stamens and thus protects the pollen from 

 moisture which would injure it. In searching 

 for honey, the insect shakes the stamens and 

 this releases the pollen, so that it falls upon the 

 insect's back and is rubbed off later on the 

 stigma of another flower. (81) 



Flowers with very long throats require 

 crossing by long-tongued insects. (82) 



