PLANTS OF SOUTHERN NEW JERSEY. 175 



//. Hairs longer than the flower scales. 



Andropogon, p. 182 

 cc. Inflorescence not obviously silky. 



d. Plants low, creeping, flowers in flattened two-ranked spikelets. 



Bragrostris liypnoides, p. 238 

 dd. Plants not creeping. 



e. Flowers provided with one or more awns hent nearly at 



right angles and often twisted spirally. 



/. Awn trifid, usually with the middle branch much 



longer than the others (which are erect), sometimes 



all three the same length. Aristida, p. 217 



//. Awn single, one on each flower. 



g. Flowers arranged in 3-7 scattered spikelets, each 

 spikelet subtended by two large glumes. 



Danthonia, p. 231 

 gg. Flowers (or spikelets) numerous, in an open or 

 contracted panicle. 

 h. Awn 50 mm. long, seed black, soon dropping. 



Stipa, p. 219 

 hli. Awn less than 25 mm. long. 

 i. Spikelets 9 mm. long. 



[Arrenathermn elatius]* 

 ii. Spikelets less than 6 mm. long, 

 y. Leaves flat. 



Sphenopholis palustris, p. 230 

 jj. Leaves involute, bristle form. 



Descliampsia Hextiosa, p. 229 

 ee. Flowers with essentially straight awns or more frequently 

 none at all. 



/. Inflorescence in a dense cylindrical spike (like timo- 

 thy, barley or wheat). 



g. With very delicate inconspicuous awns or none. 

 /}. Spikes perfectly uniformily cylindrical, .5-1 

 dm. long, 6 mm. in diameter. 

 i. No awns. [Plileum pratense]f 



ii. Thread-like projecting awns. 



Alopecurus, p. 222 

 hh. Spikes less regular, more "chaffy." 

 i. Spikes buff or whitish. 



/. 20-35 ciTi. long (coast sand). 



Ammophila, p. 228 

 jj. 2-7 dm. long, tips of leaves prolonged 

 into slender, involute bristle-like tips. 



Sporobolus, p. 222 



* Oat grass, an occasional weed. 



t Timothy, extensively cultivated for hay. 



