SRAMINEiE. 435 



2. C coarcta'ta. Torr. C. Canadensis. Katt. 



Glaucous ; stem erect, 1 — 4 feet high ; haves linear-lanceolate, scabrous, 

 with the nerves and keel white; sheaUis striate; stipule oblong-, obtuse; 

 panicle condensed and spike-form, the branches rigidly erect, short and aggre- 

 gated; ^/jtmes acuminate, lanceolate, lower 1-nerved, upper 3-nerved ; Loicer 

 palea 5-nerved, bifid at the apex, with a short, straight awn a little below the 

 tip. Bogs. Jul}'. Aug. 



Tribe 3. PHLEOIDE.E. 



Inflorescmce in dense, cylindric orvnilateral xpikes. Spilcelets l-flowered. Glumes 2, ofneariy 

 similar texture with the palecE. 



13. ALOPECU'RUS. 

 Glumes subequal, connate, distinct; paleas uniled into an 

 inflated glume, cleft on one side below the middle, generally 

 awned ; styles off en connate. 



1. A. prate'nsis. Fox-tail Grass. 



Stern erect, smooth, leafy, about 2 feet high bearing an erect, dense, many- 

 flowered, cylindric, obtuse, paniculate spike, about 2 inches long ; leaves flat, 

 smooth, with swelling sheaths and ovate stipules ; o-/;iH(Ci- ciliate, connate 

 below the middle, as long as the palese ; awn twisted, scabrous, twice tha 

 length of the flower. Fields and pastures. An excellent grass. Jn. JI. 



2. A. genicula'tus. 



Stem ascending, geniculate, rooting below, sparingly branched, 1 — 2 feet 

 high; spike cylindrical, about 2 inches long; leaves linear-lanceolate, smooth, 

 flat, acute, a few inches in length, with slightly inflated sheaths, and long, 

 entire stipules ; glumes slightly connate at base, hairy outside ; pulew truncate, 

 smooth, half as tong as the geniculate awn Wet meadov.'s. Jn. 



fi. aristulatus {Torr. A. aristulatus. Mx.) ; awns very short. 



14. PHLEUM. 

 Glumes 2, equal, carinate, much longer than the pales, 

 rostrate or mucronate; paleae 2, included in the glumes, 

 truncate, awnlcss. 



P. prate'j'se. Timoihi) or Herri's Grass. 



Stem erect, simple, terete, smooth, 2 — ^1 feet high ; leaves linear-lanceolate, 

 flat, glaucous, roughish ; .sAw^/zs striate, smooth ; stipule obtuse, lacerated ; 

 glumes apparently bicuspidate, in a dense, long, cylindric, green spike ; anthers 

 purple; 5.!*o'??ifts white. This is probably the most valuable of all grasses. 

 Introduced and extensively cultivated. Jl. 



15. SPARTI'NA. 

 Spikelets imbricated in a double row in unilateral, panicu- 

 late spikes ; glumes 2, unequal, compressed 5 paleae 2, subequal, 

 compressed, awnless ; style long, bitid. 



1. S. cynosuroi'des. 



Stem slender, smooth, 3 — 5 feet high ; leaves 2 — 3 feet long, sublinear, 

 convolute and filiform at the end ; sAfrtZAs striate, glabrous ; panicle, loose, 

 slender, composed of 20 or more alternate, one-sided, pedunculate spikes 2 — 3 

 inches long ; spikelets arranged on 2 sides of a triangular rachis ; glumes 

 acuininate°one of them with a short awn ; palea white and awnless. Marshes. 

 A coarse, sedore-like grass. Aug. 



