6i 



Blade bitter-tasted (from cum arm). 



Anthoxanthum odoratum, L. (Sweet-scented vernal). 

 No other grass has small, round ears (seen by the 

 lens) at the base of the blade. 



Fig. 10. Base of blade with small, round ears, and a 

 beard of hair. 



Ribs low and acute ; a single row of hair along the 

 summit of each rib (fig. 2). 



Avena flavescens, L. (Golden or yellow oat). No keel on 

 sheath (distinction from Bromus\ and very little on 

 the blade. 



Fig. i. Base of blade and ligule. 



Fig. 2. Transverse section of blade (magnified). After 

 Stebler. 



Blade with low flat ribs (fig. 15). 



Avena elatior, L. (False oat). Hair sparse, sometimes 



absent. Base of shoot bulbous. Sheath keeled. 

 Pig. 15. Transverse section of blade (magnified). After 

 Stebler. 



(See III. 6, 7, 8, 9, 10). 



Ribs absent ; ligule a membrane. 



Avena pubescens, L. (Downy oat). Dry, and thin-bladed. 



Fig. 20. Base of blade and ligule ; blade parallel-edged. 

 Fig. 21. Transverse section of blade, shewing absence 



of ribs and presence of median lines (magn - 



fied). After Lund. 



Ribs very low, broad, and quite flat ; ligule a hair 

 tuft. 



Triodia decumbens, Beauv. (Decumbent heath grass). 

 The only grass with ligule a tuft of hairs, and flat 

 sheath. 



Fig. 27. Rounded base of blade, and ligule a tuft of 

 hair. 



Fig. 28. Transverse section of the folded blade (magni- 

 fied). After Lund. 



Fig. 29. Transverse section of mature blade, shewing 

 the ribs (magnified). After Lund. 



