THS PARTS OF LEA FJES 83 



must act the part of foliage {i. e., perform the 

 functions of green leaves). If, for any reason, 

 the leaf-blades were to perish, it is conceivable that 

 the stipules could maintain the plant. This actually 



Fio. 79. 

 Virginia creeper. 



occurs in some plants (as in some of the vetches) , in 

 which the entire foliage is made up of large stipules. 



88a. Some of the members in Fig. 63 are probably leaf -like stipules. 

 A leaf which has no petiole is said to be sessile (». e., "sitting "J, a 

 term applied to any member which is destitute of a stalk or stem. 



89. How shall we define the parts in the leaf of 



