A STUDY OF LEAVES. 



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PETIOLE. 



The Petiole is the stem of the leaf. A leaf 

 having a petiole is petiolate, and one without a peti- 

 ole, growing directly from the main stalk, is sessile. 



When the petiole grows from the center of the 

 leaf, on the under side, it is peltate. 



Petiolate. 



Peltate. 



Sessile, 



When the base of the leaf folds around the 

 petiole, it is clasping, or amplexicaul. 



When the petiole grows to the plant-stem, the 

 leaf is decurrent. 



Amplexicaul. 



Decurrent. 



