8a. Blade margin very rough 



68. Spartina pectinata — Prairie Cordgrass 



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

 lapping hyaline margins; auricles absent; collar medium broad, divided; 

 ligule a fringe of hairs, .4 to .6 mm. long; blade 8 to 15 mm. wide, smooth 

 near base and rough near tip above, margins very rough. Inflorescence— 

 a series of comb-like spikes forming an appresscd panicle. Throughout. 

 Fresh water marshes. 



8b. Blade margin smooth 



69. Panicum hemitomen — Maidencane 



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

 lapping hyaline margins; auricles absent, collar broad; ligule a fringe of 

 hairs, .8 to 1 mm. long; blade 10 to 20 mm. wide, smooth above and be- 

 low, margins smooth and hyaline. Inflorescence— a. narrow panicle with 

 erect, distant branches. New Jersey south on Coastal Plain. Moist soil, 

 often in water. 



9a. Blade hairy above, at least near base 1° 



9b. Blade not hairy above 10 



10a. Ligule more than .5 mm. long 12 



10b. Ligule less than .5 mm. long 1 1 



11a. Sheath distinctly flattened 



70. Uniola laxa — Slender Uniola 



Leaves rolled in bud-shoot; sheath distinctly flattened, smooth and 

 hairy at top, split with overlapping hyaline margins; auricles absent; 

 collar broad, hairy behind ligule; ligule a fringe of hairs, about .4 mm. 

 long; blade 4 to 7 mm. wide, rough above, smooth and keeled below, 

 margins rough. Inflorescence—^ slender, nodding panicle. Coastal Plain, 

 Long Island south. Moist shady places. 



1 1 b. Sheath round to somewhat flattened 



71. Eragrostis hirsuta var. laevivaginata — Smooth Lovegrass 



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

 smooth, mostly with a tuft of hairs at throat, split with margins hyaline 

 or one hairy; auricles absent; collar broad, hairy at least on margins; 

 ligule a fringe of hairs, .2 to .4 mm. long; blade 5 to 10 mm. wide (oc- 

 casionally wider) , smooth above and below, margins rough. Inflorescence 

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

 south. Dry soil. 



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