MORPHOLOGY OF ANGIOSPERMS. 



in 



whalcvcr the general t}pe of venation may be and thus form a 

 net-work or reticulum, hence the leaves are said to be reticulate 

 or NETTED-NEiNED. The principal types are as follows: A chest- 



FiG. 73. Variation in the form cf leaves on the same plant: A, B, C, Leaves of 

 sassafras; D, young castor oil plant showing cotyledons (t) and variously lobed older 

 leaves. 1, lamina: p, petiole. 



nut or chinquapin leaf (Fig. 72) furnishes a good illustration 

 of ;\ i)iiinatcl} -reticulate leaf. The principal vein which runs from 



