6a. Plant tufted 



18. Danthonia spicata — Poverty Oatgrass 



Leaves folded in bud-shoot; sheath round, usually long hairy with a 

 tuft of long hairs at throat, split with overlapping hyaline margins; 

 auricles absent; collar narrow, generally with long hairs on margins; 

 ligule a fringe of hairs, .2 to .4 mm. long; blade .2 to .3 mm. wide, short 

 hairy above, rough below at least near tip, margins rough or short hairy. 

 Inflorescence — a narrow panicle with stiff, short branches bearing one 

 spikelet. Common throughout. Dry and sterile or rocky soil. 



6b. Plants with slender creeping rhizomes or stolons 



19. Zoysia matrella — Japanese Lawngrass 

 Zoysia spp. — Emerald Zoysia 



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

 smooth but mostly with a tuft of hairs at throat, split with overlapping 

 margins; auricles absent; collar hairy at least on margins; ligule a fringe 

 of hairs about .2 mm. long; blade 2 to 3 mm. wide, hairy above at least 

 near base, smooth below, margins smooth to rough. Inflorescence — 

 short, terminal, spike-like. Maryland and Delaware south. Cultivated 

 for lawns. 



'■ 



7a. Ligule membranous 13 



7b. Ligule a fringe of hairs 8 



8a. Plants extensively creeping by strong, flat stolons 



20. Cynodon spp. — U 3 Bermuda Grass 



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

 smooth with a tuft of hairs at throat, split with overlapping hyaline 

 margins; auricles absent; collar medium broad to narrow, sometimes 

 with a few long hairs on margins; ligule a fringe of hairs, .2 to .3 mm. 

 long; blade 1.5 to 2 mm. wide, smooth to somewhat rough above, smooth 

 below at least near base, margins rough. Inflorescence — 4 or 5 digitate 

 spikes. Maryland and Delaware south. Cultivated. 



8b. Plants not creeping by stolons 9 



9a. Collar hairy on margins 1 1 



9b. Collar not hairy on margins 10 



1 0a. Blade bristle-like, 1 to 1 .5 mm. wide 



21. Aristida dichotoma — Poverty Grass 



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

 ping hyaline margins; auricles absent; collar narrow, divided; ligule a 

 fringe of hairs about .4 mm. long; blade 1 to 1.5 mm. wide, bristle-like, 

 rough above, smooth below, margins slightly rough. Inflorescence — few- 

 flowered, narrow, terminal and axillary panicles. Common throughout. 

 Dry open ground. 



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