9b. Blade smooth above and below 



186. Cinna arundinacca — Stout Woodrccd 



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

 ping hyaline margins ; auricles absent ; collar medium broad ; ligule mem- 

 branous, to 6 mm. long, rounded to acute ; blade 5 to 8 mm. wide, smooth 

 above with a few long hairs near base, smooth and keeled below, margins 

 smooth to slightly rough and hyaline. Inflorescence — a many-flowered, 

 nodding, grayish-green panicle with slender branches. Throughout. 

 Moist places mostly in woods. 



GROUP 15 



la. Ligule 10 mm. or more long 



187. Zizania aquatica — Annual Wildrice 



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

 ping hyaline margins; auricles absent; collar broad, divided; ligule mem- 

 branous, 10 to 17 mm. long, acute; blade 15 to 30 mm. wide, smooth 

 above and below, midrib prominent below, margins rough and hyaline. 

 Inflorescence — a large, open, unisexual panicle. Throughout. Usually in 

 shallow water. 

 1 b. Ligule less than 1 mm. long 2 



2a. Plants found only on sandy seashores and coast dunes 



188. Panicum amarum — Seaside Panicum 



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

 ping hairy margins; auricles absent; collar broad, reddish; ligule mem- 

 branous, 2 to 4 mm. long, ciliate; blade 10 to 12 mm. wide, smooth near 

 base and rough near tip above, smooth below, margins rough and hyaline. 

 Inflorescence — a narrow, appressed panicle, one-fourth to one-third en- 

 tire height of plant. Connecticut south. Sandy seashores and coast dunes. 



2b. Plants not found as above 3 



3a. Plants with creeping rhizomes 4 



3b. Plants without creeping rhizomes 8 



4a. Blade smooth above 5 



4b. Blade rough above 7 



• 55 



