1:3 



THE BLADE. 



Some leaf-blades,as those of 

 Panicum Crus-galli (barn- 

 yard grass), P. plicatum, 

 many species of Sorghum, 

 taper each way, and are lin- 

 ear lanceolate, 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 

 Crus-galli, Cliloris, Bambusa 

 (bam boo), and in most others 

 they are found to a greater 

 or less extent, but they are 

 not often conspicuous. 



FIG. 8. Leaf-blade of A.rundo dnnax, in which 

 the nbro-vascular bundles, one after another, 

 leave the mid-rib for the blade, and those along 

 the margin terminate before reaching the apex. 

 (Duval-Jouve.) 



FIG 12. Parallel veined leaf of Poatrivialis. 

 (Duval-Jouve.) 



FIG. 13. Leaf-blade of Panicum Crus-galll 

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

 middle. (Duval-Aouve.) 



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 growth at a low temperature, and start 



FIG. 9. Cross sections of a 

 large mid-rib of the leaf of 

 Zizania aquatica; a, 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). 



