28 



FIRST LESSONS WITH PLANTS 



petioles, affording an example of leaf -stalks which 

 perform functions of leaf -blades. 



FIG. 21. 

 Various leaves of a live oak. 



FIG. 2L\ 

 Leaf of a willow. 



33. The leaf of a willow is shown in Fig. 22. 

 The stipules are so leaf -like as to indicate that they 



