5a. Ligule not more than 2 mm. long 6 



5b. Ligule more than 2 mm. long 11 



6a. Blade generally more than 15 mm. wide 7 



6b. Blade generally 1 5 mm. or less wide 8 



7a. Plants with large creeping rhizomes 



88. Panicum hemitomen — Maidencane 



Leaves rolled in bud-shoot; sheath round, smooth or sometimes 

 densely hairy, split with one margin hairy; auricles absent; collar broad; 

 ligule a fringe of hairs, 1 to 1.6 mm. long; blade to 22 mm. wide, smooth 

 above and below, margins smooth to slightly rough. Inflorescence — a 

 narrow panicle with erect, distant branches. New Jersey south on Coastal 

 Plain. Moist soil, often in water. 



7b. Plants without creeping rhizomes 



89. Setaria italica — Foxtail Millet 



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

 mostly smooth but may be short hairy or slightly rough, split with over- 

 lapping margins hairy; auricles absent; collar narrow to broad, some- 

 times divided, hairy; ligule a fringe of hairs, 1 to 2 mm. long; blade to 

 40 mm. wide, rough above, rough below at least near tip, margins rough 

 to very rough. Inflorescence — dense, bristly, cylindrical, yellowish or 

 purplish, spike-like. Cultivated for forage. 



8a. Sheath hairy 9 



8b. Sheath not hairy 10 



9a. Sheath dense long hairy 



90. Panicum capillare — Witchgrass 



Leaves rolled in bud-shoot ; sheath round, dense long hairy, split with 

 overlapping hairy margins; auricles absent; collar broad, hairy; ligule a 

 fringe of hairs, 1.4 to 1.6 mm. long, fused at base; blade 10 to 13 mm. 

 wide, dense long hairy above, short hairy below, margins long hairy. In- 

 florescence — a very diffuse, densely flowered panicle, about half entire 

 height of plant. Throughout. Cultivated fields, open ground and waste 

 places. 

 9b. Sheath sparsely short hairy 



91. Setaria viridis — Green Foxtail 



Leaves rolled in bud-shoot; sheath round, sparsely short hairy, split 

 with at least one margin hairy; auricles absent; collar narrow to broad, 

 hairy at least on margins; ligule a fringe of hairs, 1 to 2 mm. long; blade 

 8 to 15 mm. wide, smooth to rough above and below, midrib prominent 

 below, margins rough. Inflorescence — dense, bristly, cylindrical, green 

 or purplish, erect, spike-like. Common throughout. Cultivated soil and 

 waste places. 



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