178 REPORT OF NEW JERSEY STATE MUSEUM. 



a. Spikelels several or many-flowered, ob- 

 viously two-ranked and more or less flat- 

 tened. 



y. Spikelets 12 mm. or more in length. 

 k. Awned. Bronius, p. 244 



kk. Not awned. Festuca, p. 243 



//. Spikelets less than 12 mm. in length. 

 k. Panicles more than half the height 

 of the plant or secondary panicles, 

 developing all the way to the base. 

 Eragrostis, p. 237 

 kk. Panicles, if more than one, equal 

 in height and less (usually much 

 less) than half the height of the 

 plant. 

 /. Spikelets not over 3 mm. long. 



Paniciilaria ncrvata, p. 241 

 //. Spikelets over 3 mm. long. 



VK Panicle distinctly ma- 

 roon. 



Tridens flava, p. 22,6 

 mm. Panicle whitish or straw- 

 color. Paniciilaria, p. 241 

 mmnu. Panicle green. 



n. Flowers at the end 

 of capillary drooping 

 branches 50-100 mm. 

 long. 



Festuca nutans, p. 244 

 nn. Flowers much more 

 crowded on short 

 branches, not over 

 25 mm. long. 



Poa, p. 239 

 ffff. Spikelets (i) in a row or rows on slender branches 

 attached to a main scape to which they are more or 

 less appressed. or from which they branch out pal- 

 mately or fan-like ; or (2) arranged in a slender 

 appressed raceme. Spikelets sessile or nearly so. 

 g. Spikelets one flowered. 



//. Arranged in closely imbricated, one-sided 

 spikes, which stand out at an angle or are 

 appressed to the main scape. Flowers 

 awned and much flattened. Spartina, p. 232 

 hh. Arranged on digitate or fan-like spikes. 

 i. Rachis flat or winged, flowers not awned 

 nor scattered. 

 /. Spikelets flattened, disc-like, ar- 

 ranged in two rows. 



Pa^palum, p. 184 



