MM 



Mm 



in 



m 



11a. Collar hairy at least on margins 



133. Bromns tcctorum— Downy Chess 



Leaves rolled in bud-shoot; sheath round, densely soft white hairy, 

 frequently purplish, closed to near top; auricles absent; collar narrow to 

 medium broad, divided, mostly hairy; ligule membranous, 1.5 to 3 mm. 

 long, rounded to acute, may be toothed and ciliate; blade mostly 5 to 8 

 mm wide, hairy above and below and on margins. Inflorescence— a. 

 rather dense, soft, drooping, often purple panicle. Throughout. Waste 

 places. 

 lib. Collar not hairy 



134. Bromus arvensis — Field Bromegrass 



Leaves rolled in bud-shoot; sheath round, densely soft white hairy, 

 closed to near top; auricles absent; collar narrow to medium broad; 

 ligule membranous, 1.5 to 3 mm. long, rounded, sometimes toothed; 

 blade 5 to 10 mm. wide, hairy above and below, margins rough or sparse 

 long hairy. Inflorescence— an open, diffuse, somewhat drooping panicle. 

 New York south. Cultivated. 



GROUP 10 



1 a. Leaves rolled in bud-shoot 



a 

 1 b. Leaves folded in bud-shoot 



2a. Sheath hairy at least at top 6 



3 



2b. Sheath not hairy 



3a. Collar hairy on margins 



4 

 3b. Collar not hairy 



4a. Blade hairy above, at least near base 



135. Setaria geniculata— Knotroot Foxtail 



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

 with overlapping hyaline margins; auricles absent; collar narrow; ligule 

 membranous, about .6 mm. long, truncate, short ciliate; blade 5 to 8 mm. 

 wide, rough above and sparse long hairy near base, smooth below at 

 least near base, margins slightly rough at least near tip and hyaline. 

 Inflorescence— dense, bristly, cylindrical, yellow or purplish, erect, spike- 

 like. Massachusetts south. Open ground, cultivated soil, pastures, moist 

 ground and salt marshes. 



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