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 fig. 5 ? Into what is the petiole 

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

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

 What groat tribe of plants does it mark where found ? What peculiar habit f 

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

 flsr. 10 ? 



