13 



THE BLADE. 



►Some leaf-ljliules,jis those of 

 Panicum Cnis-galU (barn- 

 yard grass), P. plicatum, 

 many species of SorgJium, 

 taper each way, and are lin- 

 ear hxnceohite, but they have 

 as many bundles at the base 

 as in the middle. They are 

 like Fig. 8, only in disguise. 



Transverse veins are vis- 

 ible to the eye in Panicum 

 Criis-galU, CJ/Ioris, Bamhusa 

 (bamboo) , and in most others 

 they are found to a greater 

 ♦or less extent, but they are 

 not often conspicuous. 



Fig. 8.— Leaf -blade of Arundo clonax, in which 

 the flbro-vascular bundles, one after another, 

 leave the inid-rib for the blade, aiid those along 

 the margin terminate before reaching the apex. 

 —(Duval- Jouve. ) 



Fig 13.— Parallel veined leaf of Poairivialis.— 

 (Duval-.Iouve.) 



Fig. 13.— Leaf-blade of Panicvm Crus-galU 

 (barn-yard grass), tapering each way from the 

 middle.— (Duval-.touve.) 



►Some leaves are quite firm and remain 

 green all winter, even with considerable 

 cold and exposure, while others with a 

 little protection, will remain green for a 

 whole year. Most annual grasses and some perennials are very 

 sensitive and quickly perish and fade on the approach of a frost. 

 .Some grasses will make growtli at a low temperature, and start 



Fig. 9.— Cross sections of a 

 large mid-rib of the leaf of 

 Zizania miuatica; o, near the 

 base; h, farther up near the 

 middle; c, still nearer the 

 apex, where most of the bun- 

 dles have passed into the 

 blade. 1 x6.— (Sudworth). 



