78 



LEAVES. 



Fig. 39. 



Pinnate, at Fig. 39, a, represents the petiole or principal 

 leaf stalk ; from this spring out other divisions, each bearing a 

 leafet; $, b, represent the stipules or appendages, the \v hole- 

 taken together forms one compound pinnate leaf. The term 

 pinnate is from the Latin pinna, a wing or pinion. 



Binate ; when two leafets only form the petiole, as in Fig. 

 39, c. 



Fig- 40. Ternate; 



when the 

 leafets a- 

 rise from 

 the petiole 

 as Fig. 40, 

 a. Biter. 

 nate is a 



second division of threes, us Fig. 40, F. Triternatc is a third 

 division of threes, as Fig. 40. c. 

 Fig. 41. 



Decompound, when a pinnate leaf is again divided, or has 

 its leaves twice compound, as Fig. 41, a. At I, is a represent- 

 ation of thrice compound leaves. 



Leaves with respect to Magnitude. 



Leaves vary in size, from the small leaves of some of the 



Pinnate Binate Ternate Biternate Triternate Decompound Size of 

 leaves. 



