6o 



Base of blade with pointed ears (fig. 12). 



Ligule remarkably short, with a fringe of very short 

 hair-like teeth. Blades very thin, and dry. Hair 

 on sheath sparse or absent. 



Triticum repens, L. (Common couch). Lower sur- 

 face of blade comparatively smooth. Only a few 

 veins appear (under the lens) as white lines by 

 transmitted light. Growth creeping. 



Fig. ii. Base of blade, with ears rudimentary. 

 Fig. 12. Base of blade, with the long, curved, and 



acute ears. 



Fig. 13. The ligule (magnified). 

 Fig. 14. Transverse section of blade (magnified), 

 shewing the low inconspicuous ribs. 

 After Lund. 



Triticum caninum, Huds. (Wood couch). Lower 

 surface of blade quite rough. Most of the veins 

 appear as white lines by transmitted light. 

 Growth tufted. 



Sheath clothed with downward sloping hair. 

 Blade firm (but long and hanging), and taper- 

 based ; its keel a white line. Perennial species. 



Bromus asper, Murr. (Rough brome). 



Fig. 1 6. Eared base of blade and ligule. 

 Hordeum (Barley : the perennial species). Very 

 like Bromus asper. (See Notes.) 



As before, but annual, with blades remarkably dry 

 and thin. 



Hordeum murinum, L. (Wall barley). 



