492 THE CAMPANULALES 



which may produce thousands of seeds, whereas the simple 

 ovary of one of the Compositae contains but a single seed. 

 Reduction has been made in every part without loss of con- 

 spicuousness and variations have also appeared that practically 

 eliminate the uncertainties of crossing and autogamy, and con- 

 sequently the formation and distribution of the seed is ensured. 

 In a word every evolutionary tendency that you have noticed 

 in the development of the flower finds its expression in this 

 group of plants. 



