ZHSSONS WITS PLANTS 



Lombardy poplar) ! Is the Jeaf the ex- 

 panded portion, or is it that portion 

 plus the stalk? Let the pupil apply 

 the above tests, and answer. 



84. In the young apple foliage (Fig. 

 73), what comprises the leaf, — the ex- 

 panded portion, the stalk, the two awl- 

 like bodies at the base, or all of them 

 together? How many leaves are there 

 on the branch? 



85. Point out the extremities of the 

 leaf in the wheat (Fig. 74), or in 

 any grass. Does it attach to the stem 

 at 1 or at 6? 



86. Designate the leaves in Figs. 75 

 and 76, and give the proofs. 



XVI. THE PARTS OF LEAVES 



Pig. 74. 

 Leaf of wheat. 



87. We are now ready to believe that 

 a leaf may have two or three distinct 

 parts, — the expanded portion or blade, 

 the stalk or petiole, and appendages at 

 the base, or stipules. We also know that 

 it may have only the blade, as in the 

 live oak leaves in Fig. 77; and it may 

 have only the petiole- or the stipules. 



