13* 



THE FACTORS 



[Part I 



Fig. 68. Tropical rubi- 

 aceous moth-flowers with 

 long corolla tubes, i. Exo- 

 stemma floribnndum, Rom. 

 et Schult. 2. Posoqueria 

 hirsuta. 3. Oxyanthus hir- 

 sutus. In the Buitenzorg 

 botanic garden. Natural 

 size. 





