1 Oa. Plant pale bluish green 



9. Fcstuca ovina — Sheep Fescue 



Leaves folded in bud-shoot; sheath distinctly flattened, smooth, split; 

 auricles absent; collar medium broad, divided, indistinct; ligule man- 

 branous, about .3 mm. long, rounded; blade 1 to 1.5 mm. wide, bristle- 

 like, smooth above and below and on margins. Inflorescence-marrow 

 panicle, sometimes almost spike-like. Throughout. Occasionally culti- 

 vated. 



10b. Plant dark green 

 10. Festuca rubra var. commutata— Chewings Fescue 



Leaves folded in bud-shoot; sheath distinctly flattened, smooth or 

 very short hairy, split ; auricles absent ; collar broad ; ligule membranous 

 2 to 4 mm. long; blade 1 to 2 mm. wide, smooth above and below and 

 on margins. Inflorescence-* narrow contracted panicle. Cultivated for 

 lawns. 



11a. Blade tip boat-shaped 



11. Poa pratensis— Kentucky Bluegrass 



Leaves folded in bud-shoot; sheath distinctly flattened, smooth, split 

 with overlapping hyaline margins; auricles absent; collar broad, divided, 

 may have fine hairs on margins; ligule membranous, mostly .2 to 3 mm. 

 long but to .6 mm., truncate; blade 2 to 3 mm. wide, smooth to slightly 

 rough above, smooth and keeled below, margins smooth to slightly rough 

 or occasionally short hairy near base, tip boat-shaped. Inflorescence- 

 an open, pyramidal panicle. Common throughout. Lawns, meadows, 

 open ground and waste places. 

 lib. Blade tip not boat-shaped 



1 2a. Auricles present 



12. Lolium perenne— Perennial Ryegrass 



Leaves folded in bud-shoot; sheath distinctly flattened, smooth split 

 with overlapping hyaline margins; auricles small, slender; collar broad, 

 divided, indistinct; ligule membranous, .4 to .6 mm. long, truncate; 

 blade 2 to 3 mm. wide, smooth above and on margins, smooth and glossy 

 below. Inflorescence-long, narrow, flat spikes with unawned spikelets 

 placed edge to rachis. Common throughout. Cultivated. 



12b. Auricles absent 



13. Muhlenbergia schreberi— Nimblewill 



Leaves rolled in bud-shoot; sheath distinctly flattened, smooth, split; 

 auricles absent; collar broad, hairy on margins; ligule membranous 4 to 

 6 mm. long, rounded; blade 2 to 2.5 mm. wide, smooth above and hairy 

 near base, smooth below, margins rough and sparsely long hairy Inflo- 

 rescence-numerous, slender panicles. New Hampshire south. Lawns, 

 pastures and waste places. 



• 11 



