66 



THE PETIOLE 



Plate XVII 





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

 la the organ at fig. 1— fig. 2— fii;. 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 potiolo 

 developed ia 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 ? What peculiar habit? 

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

 fl(?. 10? 



