1^ 



BFAirXNERS' BOTANY 



Fig. 97.— Digitately Parted Leaves 

 OF Begonia. 



parted, if the sinuses 

 reach two thirds or more 

 to the midrib (Fig. 97); 

 divided, if the sinuses 

 reach nearly or quite to 

 the midrib. 



The parts arc called 

 lobes, divisions, or seg- 

 ments, rather than leaf- 

 lets. The leaf may be 

 pinnately or digitately 



lobed, parted, cleft, or divided. A pinnately parted or 



cleft leaf is sometimes said to be pinnatiiid. 

 Leaves may have 



one or all of three 



parts — blade, or 



expanded part ; pe- 

 tiole, or stalk ; stip- 

 ules, or '■^''^^ 



appendages "^^ 



at the base of the 



petiole. A leaf that 



has all threeof these 



parts is said to be 



complete (Figs. 91, 



106). The stipules 



are often green and 



leaflike and per- 

 form the function 



of foliage as in the 



pea and the Japanese quince (the latter common in yards). 

 Leaves and leaflets that have no stalks are said to be 



sessile (Figs. 98, 103), i.e. sitting. Find several examples. 



Fig. 98. — Oblong- \ ovate Sessile Leaves of 

 Tea. 



