XII. LEAVES 



128. LEAVES 



Object. To learn the parts of a simple leaf. 



Apparatus. Leaves of such common plants as elm, maple, 

 geranium, apple, and oak, with portions of the branch on which 

 they grow. 



JBtethod. Be sure to have the leaf entire. Examine 

 it. How many parts does it have ? A typical simple leaf 



has three parts, blade or 

 lamina, leafstalk, and stip- 

 ules. One or two of these 

 parts may be wanting. 

 How many parts has each 

 of the leaves examined? 

 Examine many plants and 

 determine which have per- 

 fect leaves and which have 

 one or more parts lacking. 

 Draw one or more leaves, 

 naming all parts. 



Conclusion. Name the 

 parts . of a complete leaf 

 and state where each part 



FIG. 56. Parts of a leaf. is located. 



Exercise on the Modification of Simple Leaves 



Blade. Compare leaves of willow, mullein, yarrow, 

 daisy, sunflower, nasturtium, water lily, thistle, dandelion, 



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