Group XIII. - Hairless Grasses, with very 

 Low and Flat Ribs. 



Sheath dark in colour (I. 3). 



Alopecurus pratensis, L. (Meadow foxtail). Ligule 

 shorter than broad, thick, usually coloured, hairy on 

 the back, and apparently entire. 



(Alopecurus agrestis, L. (Slender foxtail). Has rounded 

 or acute ribs, and is annual.) 



Sheath not coloured, basal or whole margin upwards 

 rough. Phleum, Briza. 



Phleum pratense, L. (Timothy or Catstail). Margin 

 upwards rough on basal portion, downwards rough 

 on apical portion. Ligule longer than broad, thin, 

 and toothed ; not hairy on the back. 

 Fig. i. Apex of blade. 

 Fig. 2. Base of blade and ligule. 

 Fig. 3. Section of sheath ; no keel. 

 Fig. 4. Back of ligule (magnified) ; no hair. 

 Fig. 5. Transverse section of blade shewing the low 



ribs and absence of keel. After Stebler. 

 Note. For other species, see Group III. 



Briza media, L. (Quaking grass). Whole margin upwards 

 rough. Ligule shorter than broad, entire. Sheaths 

 entire, except the three or four lowest. 

 Fig. ii. Entire sheath. After Lund. 

 P'ig. 12. Base of blade and ligule. 



Fig. 13. Margin of blade with teeth directed down- 

 wards, therefore upwards rough. 



Fig. 14. Portion of transverse section of blade (mag- 

 nified). After Lund. 



Milium effusum, L. (Spreading millet). Ribs practically 

 absent ; blade taper-based. Group VII. 6. 



Blade with median lines, like Poa. 



Glyceria distans, Wahl. (Reflexed sweet grass). Ribs 

 very low, very broad, and very flat. (Poa maritima 

 is bristle or concave bladed and ribless. ) 

 Fig. 15. Apex of blade. After Lund. 

 Fig. 16. Base of blade and ligule. After Lund. 

 Fig. 17. Portion of transverse section of blade shewing 

 the ribs (magnified). After Lund. 



