56 



THE PETIOLE. 



Plate XVII. 



General subject Define the word. How is the leaf in its absence ? How 

 Is the organ at flg. 1 fig. 2 fig. 3 ? What great Order represented in fig. 4, 

 and how is the petiole ? How is it at fig. 6 flg. 5 ? Into what is the petiole 

 developed in figs. 8 and 9, and what plants do they distinguish ? Describe the 

 peculiar habit in fig. 8 fig. 9. What peculiar form of the petiole in fig. 7 ? 

 What great tribe of plants does it mark where found 1 What peculiar habit ? 

 What does flg. 12 represent? Describe Its structure. What peculiarity in 

 flg. 10? 



10 



