1 1 b. Sheath smooth 



44. Agrostis tenuis — Colonial Bent 



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

 ping hyaline margins; auricles absent; collar narrow to medium broad, 

 divided; ligule membranous, .4 to 1 mm. long, truncate; blade 2 to 3 

 mm. wide, smooth to rough above and below, margins rough. Inflores- 

 cence — an open, delicate panicle. Common throughout. Pastures, lawns 

 and waste places. 



1 2a. Ligule more than 3 mm. long 13 



1 2b. Ligule 3 mm. or less long 1 4 



1 3a. Blade rough above and below 



45. Agrostis stolonifera — Meadow Bent 



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

 ping hyaline margins; auricles absent; collar narrow, divided, indistinct; 

 ligule membranous, 3 to 4.5 mm. acute; blade about 1.5 mm. wide, 

 bristle-like, rough above and below and on margins. Inflorescence — a 

 pale or purple, somewhat open panicle. Throughout. Moist, grassy 

 places. 

 1 3b. Blade smooth above and below 



46. Alopecurus carolinianus — Field Foxtail 



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

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

 membranous, 4 to 5 mm. long, acuminate; blade 2 to 3 mm. wide, 

 smooth above and below, margins rough. Inflorescence — soft, dense, 

 cylindrical, spike-like. Long Island south. Moist ground and wet places. 



14a. Blades thread-like 



47. Deschampsia flexuosa — Crinkled Hairgrass 



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

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

 1.4 to 2 mm. long, rounded; blade rolled, thread-like, about .4 mm. wide, 

 smooth. Inflorescence— a loose, open, nodding panicle with capillary 

 branches. Throughout. Dry or rocky places. 



14b. Blades not thread-like 15 



1 5a. Plants spreading by stolons 



48. Agrostis palustris — Creeping Bent 



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

 lapping hyaline margins; auricles absent; collar narrow to medium 

 broad; ligule membranous, 1 to 2 mm. long, acute; blade 2 to 3 mm. 

 wide, smooth to rough above and below and on margins. Inflorescence — 

 a narrow, dense, pale or purple panicle. Marshes along coast. Also 

 cultivated for putting greens. 



• 19 



