Leaves Simple and Compound. 133 



Shield-Formed. Compound and Trifoliate. 



157. A SHIELD-FORMED leaf is one which has 

 its veins radiating from the petiole at or near 

 the center of the leaf instead of its base. 



158. SIMPLE LEAVES. The twelve leaves just described 

 are called simple leaves, because only one leaf is attached 

 to each petiole. 



159. The GASHED LEAF is but one leaf, cut or divided, 

 and is therefore a simple leaf ; such also are the finger- 

 shaped and hand-shaped leaves. 



1 60. COMPOUND LEAVES TRIFOLIATE. When a petiole 

 bears two or more distinct pieces or blades, the blades are 

 called leaflets, and the group is called a compound leaf. 

 Three leaflets together, or near together, on the same 

 petiole, are called tri-fo'-li-ate (fri, three), as the clover. 



161. [The pupils may collect from the woods or gardens 

 as many of these varieties of leaves as they can; then 

 classify them and name their different parts ; or describe 

 each leaf as the teacher holds it up ; or attach one or more 

 leaves to a piece of paper, write .a short description of 

 each, similar to that on the following page, and hand it to 

 the teacher.] 



