3a. Ligule to 4 or 5 mm. long 



170. Glyceria striata — Fowl Mannagrass 



Leaves folded in bud-shoot; sheath distinctly flattened, smooth to 

 rough, split with hyaline margins; auricles absent; collar narrow to 

 broad, may be divided ; ligule membranous, 2 to 5 mm. long, rounded to 

 acuminate; blade 5 to 10 mm. wide, smooth to slightly rough above, 

 smooth and keeled below, margins smooth to rough, tip generally boat- 

 shaped. Inflorescence — an open, nodding panicle. Throughout. Moist 

 meadows and wet places. 



3b. Ligule to 8 or 10 mm. long 4 



4a. Blade 3 to 6 mm. wide 



171. Glyceria acutiflora — Creeping Mannagrass 



Leaves folded in bud-shoot; sheath distinctly flattened, smooth, split 

 part way with hyaline margins; auricles absent; collar narrow, divided; 

 ligule membranous, 4 to 10 mm. long, rounded to acuminate; blade 3 to 

 6 mm. wide, slightly rough above, smooth and keeled below, margins 

 smooth. Inflorescence- — a narrow panicle with stiff branches bearing 1 

 to 3 spikelets. New Hampshire south. Wet soil and shallow water. 



4b. Blade 7 to 12 mm. wide 



172. Glyceria septentrionalis — Eastern Mannagrass 



Leaves folded in bud-shoot; sheath distinctly flattened, smooth, split 

 part way with hyaline margins; auricles absent; collar broad, divided; 

 ligule membranous, 4 to 8 mm. long, acute; blade 7 to 12 mm. wide, 

 rough above, keeled and smooth below at least near base, margins rough. 

 Inflorescence — a somewhat open panicle with a few long, slender 

 branches. Throughout. Wet places and shallow water. 



5a. Blade usually not more than 5 mm. wide, tip boat-shaped ... 6 



5b. Blade 6 to 1 2 mm. wide, tip not boat-shaped 



173. Dactylis glomcrata — Orchard Grass 



Leaves folded in bud-shoot ; sheath distinctly flattened, smooth to some- 

 what rough or rarely short hairy, mostly split part way only with hyaline 

 margins; auricles absent; collar broad, divided; ligule membranous, 3 to 

 10 mm. long, mostly acuminate; blade 6 to 12 mm. wide, mostly smooth 

 near base and rough near tip above and below, keeled below, margins 

 rough. Inflorescence — a panicle with spikelets crowded in dense clusters 

 at end of the few, stiff branches. Common throughout. Fields, meadows 

 and waste places. 



51 



