GENEEAL MOEPHOLOGY OP THE PLANT 65 



culent ones they are embedded in the substance of the blade 

 These strands are known as the veins, and their arrangement 

 constitutes the venation of the leaf. The latter depends broadly 

 on the mode of branching which characterises the epipodium 



Fig. 108. 



Fig. 110. 



Fig. 109 



Fig. 111. 



Fig. 108. Leaf of the Cherry with lamina, petiole, and stipules. The lamina 

 has serrate margins, and a large central vein or midrib is seen to proceed 

 from the petiole to bhe apex of the leaf, and to give oil from its sides the 



other veins {pinnalely veined). Fig. 109. Ribbed leaf of Cinnamon with 



entire margins. Fig. 110. Leaf of the Melon with dentate margins. 



The venation is said to be radiated or palmately veined. Fig. 111. a. 



Parallel venation of a grass ; this variety of venation is commonly called 

 straight-veined, h. A. variety of parallel venation sometimes termed 

 curve-veined, as seen in the Banana. 



There are two marked modiiications of venation. In the 

 first modification the fibro-vascular tissue as it enters the lamina 



VOL. I, F 



