LEAVES 75 



(d) Leaves are frequently developed for climbing, as in the 

 case of the pea and most vetches (Fig. 56). 



(e) Leaves are sometimes modified into traps for the catch- 



FlG. 56. — Leaves developed for climbing. 



ing of insects, as in the case of the pitcher plants, the Venus 

 fly-trap and the sundevs^ (Fig. 57). 



Arrangement of Leaves. — The arrangement of the leaves on 

 the stem is also an important characteristic. They may be alter- 

 nate, opposite, whorled or clustered. They may be arranged on 

 the stem in two, three, five or more ranks. They may be scat- 



