KINDS OF LEAVES 



97 



142. Digitately com- 

 pound leaf of rasp- 

 berry. 



The parts are called lobes, divisions, or segments, rather 



than leaflets. The leaf may be pinnately or digitately lobed, 



parted, cleft, or divided. A pinnately parted 



or cleft leaf is sometimes said to be pinnatifid. 

 206. Leaves may have one or all of 



three parts blade or expanded part, petiole 



or stalk, stipules or appendages at the base 



of the petiole. All these parts are shown in 



Fig. 145. A leaf that has all three of these 



parts is said to be complete. The stipules 

 are often green and 

 leaf-like and per- 

 form the function 

 of foliage, as in the 

 pea and Japanese 

 quince (the latter common in 

 yards). 



207. Leaves and leaflets that 

 have no stalks are said to be sessile 

 (Fig. 149), i.e., sitting. The same is 



143. Lobed leaf of sugar maple. ^ Qf flowers and f ruits> T h e blade 



of a sessile leaf may partly or wholly surround the stem, 



when it is said to be clasping (Fig. 146). In some cases the 



leaf runs down the stem, 



forming a wing: such leaves 



are said to be decurrent 



(Fig. 147). When opposite 



sessile leaves are joined by 



their bases, they are said 



to be connate (Fig. 148). 



208. Leaflets may have 

 one or all of these three 

 parts, but the stalks of leaf- 

 lets are called petiolules and 



the Stipules Of leaflets are 144. Digitately parted leaves of begonia. 



