176 REPORT OF NEW JERSEY STATE MUSEUM. 



a. Spikes greenish, not over one inch long, 

 plant less than i dm. high. 



[Aira praecox]X 

 gg. With very conspicuous awns, making the whole 

 spike bristly. 



h. Spike millet-like, flowers like round seeds at 



the base of the (often tawny) projecting 



bristles. Chcstochloa, p. 212 



hh. Spikes rye-like, flowers long, spindle-shaped, 



foliage often bluish green or glaucous. 



i. Spikes compact. 



;. Awns 50 mm. long. 



[Hordeuni iubatutn]* 

 }'}'. Awns 12-75 nim. long. Elymus, p. 245 

 a. Spikes with flowers scattered in pairs. 



Hystrix, p. 246 

 //. Inflorescence in a dense plume-like contracted or 

 glomerate panicle. 

 g. Panicle 15 X 5 cm. or larger, purplish, leaves 

 20-75 i^ni- wide. 

 h. Long awns, spikelets one-flowered. 



Echinochloa, p. 212 

 hh. Not awned spikelets, several flowered. 



Phragmites, p. 235 

 gg. Panicle 10-15 X 2-3 cm. green or slightly pur- 

 plish, leaves 12 mm. wide. 

 h. Spikelets one-flowered. 



i. A small tuft of hairs inside the glumes at 

 the base of the flowers. 



Calamagrostis cinnoides, p. 227 

 a. No tuft at the base of the flowers. 



Phalaris, p. 216 



hh. Spikelets two-flowere ', foliage soft and 



downy. [Holcus lanatus]f 



iff. Inflorescence in an open panicle, branches not at all 



appressed to the main culm. 



g. Pistillate flowers above, staminate below, tall 

 marsh grass. Zisania, p. 214 



gg. Flowers not separated. 



h. Spikelets largely sessile and massed on the 

 branches. 



i. Spikelets one-flowered. 

 ;. Much flattened. 



Homalocenchrus, p. 215 



t Hair grass, an occasional weed. 

 * Squirrel-tail grass, an occasional weed. 



t Meadow soft grass, commonly established in damp meadows. PI. X., 

 Fig. 4. 



