144 



OEGANOGEAPHY. 



In some plants, as Mosses, those living under water, &c., the 

 leaves have no fibro-vascular skeleton, and consequently no true 

 veins, and are hence said to be veinless ; while in succulent plants 

 the veins are hidden more or less from view, in consequence of 

 the great development of parenchyma, in which case the leaves 

 are termed hidden-veined. 



Fig. 282. 



h 284. 



Fig. 283. 



Fig. 285. 



Fig. 282. Leaf of the Cherry with lainitia, petiole, and stipules. A large 

 central vein is seen to proceed from the petiole to the apex of the 

 leaf, and to give off from its sides the other veins of the leaf. This 



central vein is termed the midrib. Fig. 283. Ribbed leaf of Cinnamon. 



• Fig. 284. Leaf of the Melon vs'ith a dentate margin. The venation 



is said to be radiated or palmately-veined. Fig. 285. a. Parallel 



venation of a Grass; this variety of venation is called straight-veined. 

 &. A variety of parallel venation sometimes termed curve-veiued as 

 seen in the Banana. 



