INTRODUCTORY. 7 



Spike ovoid, almost globular. 

 Spike smooth. Phalaris. 

 Spike with long, silky hairs. Lagurus. 



Spike tapering from base. 



Spikelets flattened. Polypogon. 

 Spikelets not flattened. Gastridium. 



Spike fusiform or cylindrical. 



Ligule lengthy and bifid. Psamma. 

 Ligulc not lengthy and bifid. 



Spike interrupted near base. Koeleria. 

 Spike regular. 



Leaf base with rounded ears (anthers 2). Anthox- 



anthum . 

 Spikelets imbricated, colour bluish. Sesleria. 

 Spike silky. Alopecurus. 

 Spike bristly. 



Spikelets compressed laterally. Phleum. 

 Spikelets compressed dorsally. Panicum (as 

 regards P. verticillatum, P. glaucum, and P. 

 viride, frequently grouped into Set-aria). 



Spikes compound. 



Spikelets on one side only 



Panicum (as regards P. crus-galli, frequently assigned to 

 Echinochloa). 



Spikelets on both sides. Br achy podium. 



Panicles. 



Glumes absent. Leersia. 



Sheath quadrangular and not split. Melica. 



Sheath white with red veins. Holcus. 



Stem solid and bent at the only node. Molinia. 



Spikelets orbicular. Briza. 



Leaves glaucous above, dark green below. Triodia 



Spikelets with one floret. 



Leaves smooth and broad. Milium. 

 Leaves rough. 



