Group II. Blade Variegated. 



The narrow white strips are only seen when the blade 

 is held up to the light (fig. 4). 

 Tufted Hair Grass (Aira cccspitosd], 



Fig. J. Base of blade and long acute ligule. 

 Fig. 2. Acute apex of blade. 



Fig. 3. Portion of blade (magnified). Observe the 

 very high acute ribs, the summits of each with 

 teeth, which give the file-like roughness to 

 the blades. C ~i 



Fig. 4. Portion of blade as it appears by transmitted 

 light (magnified). The six white lines are 

 seen. 



Fig. 5 Transverse section of young blade (magni- 

 fied). After Lund. 



Group III. Bulbous Grasses. 



Ribs low and flat ; the ligule has no hair on its back 



(fig- 4)- 



Timothy (Phleitm pratense]. The basal margin is upwards 



rough. 



Fig. I. Apex of blade. 

 Fig. 2. Base of blade and ligule. 

 Fig. 3. Section of sheath ; no keel. 

 Fig. 4. Back of ligule without hair (magnified). 

 Fig. 5. Transverse section of blade, shewing low ribs, 

 and absence of keel (magnified). 



The ligule has hair on the back (fig. 9). 



False Oat (Avena elatior}. The basal margin is not up- 

 wards rough. 

 Fig. 6. Apex of blade. 

 Fig. 7. Base of blade and ligule. 

 Fig. 8. Section of keeled sheath. 

 Fig. 9. The hairy ligule (magnified). 

 Fig. 10. Transverse section of blade, shewing the low, 

 flat ribs, and the keel (magnified). After 

 Stebler. 



