Vlll CONTENTS. 



VII. 



PAGE 



GERMINATION AND GROWTH . .137 



VIII. 

 SEXUAL REPRODUCTION ........ . 163 



IX. 

 POLYMORPHISM . . 1S2 



X. 



INFLUENCES AND EFFECTS .209 



HABITATS 



233 



XII. 

 CULTIVATION 253 



XIII. 

 GEOGRAPHICAL DISTRIBUTION ......... 266 



XIV. 

 COLLECTION AND PRESERVATION ........ 287 



