LEAVES. 



55 



Fig. 77. 



Fig. 76. 



Fan-shaped leat 



Fig. 78. 



A 



Acute 

 apex. 



Pectinate leaf. 



Acuminate, when the extremity is elongated beyond what 

 would form the regular figure of the leaf. (Fig. 80.) 

 Emarginate, having a notch at the end. (Fig. 81.) 



79. 



Obtuse apex. 



Fig. 80. 



Acuminate. 



Fig. 81. 



n 



Emarginate. 



Mucronate, terminating by a spine. (Fig. 82.) 



Truncate, when it has the appearance of having been cut off. 



(Fig. 83.) 



Retuse, slightly depressed at the apex with a waved margin. 



(Fig. 84.) 



Fig. 84. 

 Fig. 82. Fig. 83. 



Mucronate, 



n 



Truncate. 



Retuse apex. 



In the earliest stages of growth all leaves are simple, the 

 articulations being the result of growth. 



93. Compound leaves are those which have the laminae artic- 

 ulated to a common petiole. This fact must be borne in mind 

 as the real distinction between simple and compound leaves. 



Acuminate ? Emarginate ? Mucronate ? Truncate ? Retuse ? — 98. 

 How are all leaves in their earliest stage ? What are compound leaves ? 



