

7b. Ligule .6 to 1 mm. long 



141. Paspalum pubescens — Hairy Paspalum 



Leaves rolled in bud-shoot ; sheath distinctly flattened, hairy at least at 

 top, split with at least one overlapping margin hairy; auricles absent; 

 collar narrow, hairy; ligule membranous, .6 to 1 mm. long, rounded; 

 blade 10 to 18 mm. wide, long hairy above, hairy below with midrib 

 prominent, margins long hairy and hyaline. Inflorescence— 1 to 3 one- 

 sided, spike-like branches with flat round to oval seed. Vermont south. 

 Pastures, open ground and old fields. 



a 

 8a. Blade tips boat-shaped 



8b. Blade tips not boat-shaped 1 1 



9a. Plants with slender creeping rhizomes 



9b. Plants tufted, without creeping rhizomes 



142. Poa annua — Annual Bluegrass 



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

 with overlapping hyaline margins; auricles absent; collar medium broad, 

 divided; ligule membranous, .8 to 1 mm. long, rounded; blade to 4 mm. 

 wide, smooth above and below, margins smooth at least near base tips 

 boat-shaped. Inflorescence-* small, open, few-branched panicle. Com- 

 mon throughout. Lawns, pastures, open ground and waste places. 



10a. Plant bluish-green, somewhat glaucous 



143. Poa compressa — Canada Bluegrass 



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

 split with overlapping hyaline margins; auricles absent; collar narrow to 

 broad, divided, occasionally hairy; ligule membranous, mostly .6 to 1 

 mm. long, truncate; blade glaucous, to 6 mm. wide, smooth above and 

 below, keeled below, margins at least slightly rough and hyaline tips 

 boat-shaped. Inflorescence— a narrow, short-branched panicle. Com- 

 mon throughout. Meadows, open ground and waste places. 



10b. Plant dark green, not glaucous 



144. Poa pratensis— Kentucky Bluegrass 



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

 with overlapping hyaline margins; auricles absent; collar narrow to 

 broad, divided, sometimes hairy on margins; ligule membranous, .2 to 

 1 mm. long (mostly .4 to .6), truncate; blade to 5 mm. wide, smooth 

 above but occasionally short hairy, smooth and keeled below, margins 

 smooth to slightly rough, tip boat-shaped. Inflorescence— an open 

 pyramidal panicle. Common throughout. Lawns, meadows, open 

 ground and waste places. 



• 43 



