8b. Blade rolled and bristle-like 10 



9a. Blade margins smooth 



39. Agrostis palustris — Creeping Bent 



Leaves rolled in bud-shoot; sheath round, smooth, split with over- 

 lapping hyaline margins; auricles absent; collar narrow; ligule mem- 

 branous, .6 to .8 mm. long, rounded, toothed; blade about 1 mm. wide, 

 flat, smooth above and below and on margins. Inflorescence — a narrow, 

 dense, pale or purple panicle. Marshes along coast, also cultivated for 

 putting green. 



9b. Blade margins rough 



40. Agrostis canina — Velvet Bent 



Leaves rolled in bud-shoot ; sheath round, smooth, split with overlap- 

 ping hyaline margins; auricles absent; collar medium broad; ligule 

 membranous, .4 to .8 mm. long, rounded to acute; blade about 1 mm. 

 wide, flat, smooth above and below, margins rough and hyaline. Inflo- 

 rescence — a loose, spreading panicle. Maine to Delaware. Meadows 

 and open ground. Cultivated for putting greens. 



rffft 



10a. Lower sheaths slightly longer than the internodes 



41. Festuca myuros — Rattail Fescue 



Leaves folded in bud-shoot; sheath round, smooth, split with over- 

 lapping hyaline margins ; auricles absent ; collar narrow to broad ; ligule 

 membranous, .4 to .8 mm. long, truncate, sometimes toothed ; blade 1 to 2 

 mm. wide, bristle-like, smooth or rough or very short hairy above, 

 smooth below and on margins. Inflorescence — a narrow panicle with 

 appressed branches. Coastal Plain. Massachusetts south. Open ground. 



10b. Lower sheaths shorter than the internodes 



42. Festuca octoflora — Six-weeks Fescue 



Leaves folded in bud-shoot ; sheath round, smooth, split with overlap- 

 ping hyaline margins; auricles absent; collar narrow; ligule membranous, 

 .4 to .8 mm. long, truncate; blade 1 to 2 mm. wide, bristle-like, smooth 

 above or sometimes short hairy, smooth below, margins smooth to slight- 

 ly rough. Inflorescence — a narrow panicle with short branches. New 

 York south. Open sterile ground. 



11a. Sheath hairy 



43. Digitaria filiformis — Slender Crabgrass 



Leaves rolled in bud-shoot; sheath round, long hairy (upper smooth) , 

 split; auricles absent; collar narrow, divided; ligule membranous, .6 to 1 

 mm. long, truncate; blade 2 to 3 mm. wide, smooth above and below, 

 margins smooth and hyaline. Inflorescence — 1 to 5 digitate, spike-like 

 branches. New Hampshire south. Sandy fields and sterile open ground. 



18 



