8a. Ligule ciliate 



167. Andropogon scoparius — Little Bluestem 



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

 may be sparsely short hairy or hairy along margins, split with overlapping 

 margins sometimes hairy; auricles absent; collar narrow to broad, may 

 be divided or hairy; ligule membranous, 1 to 2 mm. long, truncate to 

 rounded, ciliate; blade to 8 mm. wide, mostly rough above and may be 

 hairy near base, keeled and smooth to rough below, margins rough and 

 occasionally long hairy near base. Inflorescence — a narrow panicle with 

 flexuous, feathery branches. Throughout. Dry hills and fields. 



8b. Ligule not ciliate 



168. Andropogon ternarius — Silver Beardgrass 



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

 purplish, split with overlapping hyaline margins ; auricles absent ; collar 

 mostly narrow, divided, may have a few long hairs on margins; ligule 

 membranous, 1 to 1.6 mm. long, rounded; blade to 7 mm. wide, smooth 

 to rough above and sometimes long hairy, smooth to slightly rough and 

 keeled below, margins mostly rough but may be long hairy at least near 

 base. Inflorescence— a narrow panicle with silvery to creamy or grayish, 

 feathery branches. Delaware south. Dry sandy soil. 



GROUP 13 



la. Plants growing in wet places and shallow water 2 



lb. Plants not generally found in wet places 5 



2a. Ligule 3 mm. or less long 



169. Glyceria canadensis — Rattlesnake Mannagrass 



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

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

 dium broad, divided; ligule membranous, 2 to 3 mm. long, truncate to 

 rounded; blade 5 to 10 mm. wide, smooth to rough above and below, 

 keeled below, margins smooth to somewhat rough and hyaline. Inflores- 

 cence—an open panicle with branches distant and drooping. Through- 

 out. Bogs and wet places. 



2b. Ligule more than 3 mm. long 3 



50 



