7b. Plants not glaucous 



193. Calamagrostis canadensis — Blucjoint 



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

 split with overlapping margins; auricles absent; collar medium broad to 

 broad, divided; ligule membranous, 3 to 5 mm. long, rounded; blade to 

 1 2 mm. wide, rough above, keeled and smooth to rough below, margins 

 rough and hyaline. Inflorescence — a loose, open, purple-tinged panicle. 

 South to Maryland and West Virginia. Marshes and wet places. 



8a. Widest blades 25 mm. or more 



194. Sorghum sudanense — Sudan Grass 



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

 ping hyaline margins; auricles absent; collar broad, divided, sometimes 

 hairy at base; ligule membranous, 3 to 4 mm. long, rounded, ciliate; 

 blade 20 to 40 mm. wide, smooth above and below, midrib white above 

 and prominent below, margins smooth to very rough and hyaline. In- 

 florescence — a large, loose, erect panicle. Cultivated for forage. 



8b. Widest blades not more than 20 mm 9 



9a. Ligule notched near front on one or both sides 



195. Phleum pratense — Timothy 



Leaves rolled in bud-shoot ; sheath round, mostly keeled, smooth, split 

 with overlapping hyaline margins; auricles absent; collar mostly broad 

 and divided; ligule membranous, 3 to 6 mm. long, rounded to acute, 

 notched near front on one or both sides, frequently toothed in center; 

 blade to 14 mm. wide, generally smooth near base and rough near tip 

 above and below, keeled below, margins rough and hyaline. Inflores- 

 cence — densely flowered, cylindrical, spike-like. Common throughout. 

 Fields and waste places. 



9b. Ligule not notched as above 10 



1 Oa. Sheath hairy 1 1 



10b. Sheath not hairy 13 



11a. Blade densely velvety hairy above and below 



196. Holcus lanatus — Velvet Grass 



Leaves rolled in bud-shoot; sheath loose, round, dense velvety short 

 hairy, split with overlapping hyaline margins; auricles absent; collar 

 narrow to medium broad, usually divided, hairy; ligule membranous, to 

 3 mm. long, rounded, may be toothed and ciliate; blade to 16 mm. wide, 

 velvety short hairy above and below, keeled near base below, margins 

 short hairy. Inflorescence — a long, contracted, pale, purple-tinged pani- 

 cle. Throughout. Open ground, meadows and moist places. 



• 57 



