15b. Plant without creeping rhizomes 



76. Setaria italica — Foxtail Millet 



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

 split with overlapping hairy margins; auricles absent; collar medium 

 broad to broad, hairy and hairy on margin; ligule a fringe of hairs, .6 

 to 1 mm. long, sometimes fused at base ; blade 1 2 to 20 mm. wide, rough 

 above, smooth below at least near base, margins rough and hyaline. In- 

 florescence — dense, bristly, cylindrical, yellowish or purplish, spike-like. 

 Cultivated for forage. 



16a. Sheath margins hairy (at least one) 17 



16b. Sheath margins hyaline 19 



17a. Ligule less than .5 mm. long 



77. Eragrostis hirsuta var. laevivaginata — Smooth Lovegrass 



Leaves rolled in bud-shoot; sheath round, smooth with a tuft of hairs 

 at throat, split with one margin hyaline and one hairy; auricles absent; 

 collar broad, ring of hairs at base ; ligule a fringe of hairs, .3 to .4 mm. 

 long, fused at base; blade 8 to 12 mm. wide, smooth above with a few 

 long hairs near base, smooth and glossy below, margins rough. Inflores- 

 cence — a diffuse panicle more than one-half entire height of plant. 

 Maryland south. Dry soil. 



17b. Ligule about 1 mm. long 18 



^ l ,'uaAn l l 1 '"il''f",' , iV','l l ,';',' l fe 



! IfflffilWa 





1 8a. Plants with a bare sticky ring just below node 



78. Panicum scoparium — Velvety Panicum 



Leaves rolled in bud-shoot; sheath round, dense velvety white hairy, 

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

 broad, dense white hairy; ligule a fringe of hairs, about 1 mm. long; 

 blade 15 to 25 mm. wide, velvety short hairy above and below, margins 

 short hairy. Inflorescence — an open, many branched panicle with sticky 

 blotches on axis and branches. Massachusetts south. Wet or damp soil. 



18b. Plants without bare ring below nodes 



79. Panicum capiliare — Witchgrass 



Leaves rolled in bud-shoot; sheath somewhat flattened, long stiff 

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

 narrow, hairy; ligule a fringe of hairs, about 1 mm. long; blade 10 to 

 15 mm. wide, short hairy above and below, keeled below, margins rough 

 and short hairy. Inflorescence — a very diffuse, densely flowered panicle, 

 about half entire height of plant. Throughout. Cultivated fields, open 

 ground and waste places. 



• 27 



