FOLIAGE- LKAVKS. 119 



The terms by which simple leaves are described are 

 applicable also to the leaflets of compound leaves, to the 

 sepals and petals of flowers, and, in short, to any flat forms. 



Fig. 165. Fig. 166. 



180. We have already explained that compound leaves 

 are of two forms, pinnate and palmate. In the former the 

 leaflets are arranged on each side of the mid-rib. Thercmay 

 be a leaflet at tlie end, in which case the leaf is odd-pirmcde; 

 or the terminal leaflet may be wanting, and then the leaf is 



Pig. 167. 



abruptly pinnate. In the Pea, the leaf is pinnate and 

 terminates in a tendril (Fig. 135). Very frequently the 

 primary divisions of a pinnate leaf are themselves pinnate, 

 and the whole leaf is then twiee-pinnate (Fig. 167); If 



Figs. 165 to 167. — Various forms of foliage-leavca. 



