2a. Blade not more than 5 mm. wide 3 



2b. Blade more than 5 mm. wide 5 



3a. Blade rough above and below 4 



3b. Blade smooth to very slightly rough above and below 



178. Alopecurus carolinianus — Field Foxtail 



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

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

 divided; ligule membranous, to 4 or 5 mm. long, rounded to acuminate; 

 blade to 4 mm. wide, smooth to slightly rough above and below, margins 

 slightly rough to rough. Inflorescence — soft, dense, cylindrical, spike-like. 

 Long Island south. Moist ground and wet places. 



j ---- ' -i- ' -' 7 i 



4a. Blade 1 .3 to 2 in. long 



179. Agrostis hiemalis — Spring Hairgrass 



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

 overlapping hyaline margins; auricles absent; collar narrow, mostly 

 divided, generally purple; ligule membranous, to 4 mm. long, rounded 

 to acute, lacerate; blade to 3.5 mm. wide, rough above and below and 

 on margins. Inflorescence — a purplish, spreading, slender-branched pani- 

 cle. Massachusetts south. Open ground, fields and waste places. 



4b. Blade 3 to 8 in. long 



180. Agrostis scabra — Fly-away Grass 



Leaves rolled in bud-shoot; sheath round, somewhat rough, split with 

 overlapping hyaline margins; auricles absent; collar medium broad, 

 divided; ligule membranous, to 5 mm. long, rounded to acute, lacerate; 

 blade to 5 mm. wide, rough above and below and on margins. Inflores- 

 cence — a very diffuse, purple to green panicle. Throughout. Fields and 

 meadows. 



5a. Plants with creeping rhizomes 6 



5b. Plants without creeping rhizomes 7 



6a. Blade tapering to a narrow base 



181. Sorghastrum nutans — Indian Grass 



Leaves rolled in bud-shoot; sheath round, smooth, frequently hairy 

 near base or at nodes, split with overlapping hyaline margins; auricles 

 absent; collar narrow to broad, may be divided; ligule membranous, 3 to 

 as much as 10 mm. long, rounded, may be 1- or 2-notched, mostly hairy 

 on back, sometimes ciliate; blade 5 to 10 mm. wide, tapering to a narrow 

 base, smooth to rough above and below, keeled below, margins rough. 

 Inflorescence — a narrow, yellowish or reddish-brown panicle. Through- 

 out. Waste places. 



53 



