Vlll CONTENTS. 



VII. 



PAGE 

 GERMINATION AND GROWTH ..." 137 



VIII. 



Sexual Reproduction 163 



IX. 

 Polymorphism 1S2 



X. 

 Influences and Effects 209 



XI. 

 Habitats 233 



XII. 

 Cultivation . 253 



XIII. 

 Geographical Distribution 2G6 



XIV. * . 



Collection and Preservation 287 



