1 4b. Blade rough and short hairy above 



96. Setaria faberii — Giant Foxtail 



Leaves rolled in bud-shoot; sheath round, smooth and hairy at top, 

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

 on margins; ligule a fringe of hairs, 2 to 3 mm. long; blade 10 to 20 mm. 

 wide, rough and short hairy above, smooth and keeled below, margins 

 rough and hyaline. Inflorescence — dense, bristly, cylindrical, nodding, 

 spike-like. New York south. Common. Waste and cultivated ground. 



15a. Blade not more than 15 mm. wide 



97. Panicum virgatum — Switchgrass 



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

 one margin hairy; auricles absent; collar broad, may be hairy on mar- 

 gins; ligule a fringe of hairs 2 to 3 mm. long, fused at base; blade 7 to 

 15 mm. wide, mostly hairy above at least near base but may be smooth, 

 smooth below at least near base, margins at least slightly rough and 

 hyaline or scarious. Inflorescence — an open, widely spreading panicle. 

 Common throughout. Open ground and brackish marshes. 



1 5b. Blade to 20 mm. or more wide 16 



1 6a. Blade short hairy above 



98. Setaria faberii — Giant Foxtail 



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

 lapping margins hairy; auricles absent; collar broad, may be divided, 

 hairy on margins; ligule a fringe of hairs, 2 to 3 mm. long, may be fused 

 at base; blade 10 to 20 mm. wide, short hairy above, smooth below at 

 least near base with midrib prominent, margins rough to very rough. 

 Inflorescence — dense, bristly, cylindrical, nodding, spike-like. New York 

 south. Common. Waste and cultivated ground. 



16b. Blade rough or short hairy near base only 



99. Setaria italica— Foxtail Millet 



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

 split with overlapping hairy margins; auricles absent; collar narrow 

 to broad, sometimes divided, hairy; ligule a fringe of hairs, 2 to 3 mm. 

 long; blade to 30 mm. wide, rough above and short hairy near base, 

 slightly rough below with midrib prominent, margins rough and hyaline. 

 Inflorescence — dense, bristly, cylindrical, yellowish or purplish, spike- 

 like. Cultivated for forage. 



1 7a. Blade not more than 1 5 mm. wide 18 



32 



