i8o REPORT OF NEW JERSEY STATE MUSEUM. 



hh. Spikelets sessile or nearly so in an erect (or 

 sometimes slightly drooping) raceme. 

 i. Spikelets sessile, remote and alternately 

 arranged on the somewhat zig-zag rachis. 

 [Lolium perrenne'\'\ 

 a. Spikelets numerous, slightly pediceled, 

 some in slender appressed branches, scat- 

 tered along the main culm. 

 /. Leaves bristle-like, inflorescence 7- 

 10 cm. in length. Pestuca, p. 243 



jj. Leaves flat, inflorescence 7-12 cm. in 

 length. Sphenopholis, p. 229 



///. Leaves flat, inflorescence, 20-25 cm. 

 in length. JJniola laxa, p. 239 



Hi. Spikelets in a dense, erect, appressed 

 spike. 

 y. Spikelets 5-15 mm. long. 



k. Spike 120 X 25 mm. wide. 



Panicularia obtusa, p. 241 

 kk. Spike 35 X 12 mm. 



Distichlis. p. 239 

 kkk. Spike 75 X 12 mm. "wheat- 

 like." [Agropyron repens]t 

 jj. Spikelets 2-3 mm. long. Spike 75- 

 X 12 mm. 



Sphenopholis obfusata, p. 230 

 an. Spikelets in a somewhat looser but still 

 appressed, often drooping raceme. 

 j. Spikelets 3 mm. long or less. 



Poa or Piiccincllia, pp. 239, 243 

 /;'. Spikelets 25 mm. long. 



Panicularia septcntrionalis, p. 242 



TRIPSACUM L. 

 Tripsacum dactyloides L. Gama Grass. 



Plate VL, Fig. i. 



Coix dactyloides Linnseus, Sp. PI. 972. 1753 [America]. 



Tripsacum dactyloides Nuttall Gen. L 85. 1818. — A. Brown, Bull. Torrey 

 Bot. Club VIL 114. 1880.— Britton 283.— Keller and Brown 30. 



This large and striking grass with its pecuHar thick and 

 jointed inflorescence is restricted to the coastal strip, extending 

 like other coastal species some distance up the larger rivers. 



Fl. — Late July to late September. 



t Ray-grass. A weed in waste and cultivated ground. 

 X Quitch-grass. An occasional weed. 



