MONOECIA TRIANDRIA. 431 



HAB. Bogs. May, Ij.; culm 18 inches high; spike narrow; fr. 



and glume brown. 



2. With 3 stigmas. 



C. pedunculata : spikes about 4, on long peduncles, very remove ; fruit 

 obovate, triquetrous, obtuse, smooth, entire at the orifice ; glumes ovate, 

 mucronate, (purple and green.) 



HAB. Rocky hills. May, 7|_ ; culmjllif., 6 inches high ; peduncles 

 mostly radical. 



b. Summit pistiliferous. 

 1. With 2 stigmas. 



C. arida : spikes 8, (large) subapproximate, dry ; fruit elliptical, com- 

 pressed, winged, terete in the middle, acuminate at each end, diverg- 

 ingly bifid ; culm leafy. 



HAB. Meadows. June, 7J. ; culm 2 3 feet high ; leaves dark gr. ; 

 spike gray. 



C. lagopodioides : spikes numerous, (10 16,) elliptic, crowded ; bract 

 beneath the lowest overtopping the culm ; fruit lanceolate, acuminate, 

 erect, bicuspidate, with a harrow serrulate margin, twice as long as 

 the ovate-lanceolate glume. 



HAB. Wet meadows. May, 7].; spikes large, at first subcylindric. 



C. scoparia : spikelets mostly 5, (sometimes 6 or 7,) ovate, sessile, ap- 

 proximate, aggregate, lowest one bracteate ; fruit ovate-lanceolate, 

 margined, nerved, smooth, bicuspidate, longer than the lanceolate-acu- 

 minate glurne. 



HAB. Wet meadows. May, 1]. ; fruit not winged, tawny ichen 

 mature. 



C. straminea : spikes about 5, (4 7,) roundish, approximate, with short 

 bracts at the base ; fruit roundish-ovate, rostrate, compressed, broadly 

 ovate, bidentate, serrulate, longer than the lanceolate glume. 



HAB. Wet meadows. May, 7}. ; a foot high ; spikes yellowish ; fr. 

 acuminate. 



C. fcenea : spikes numerous, (8 10,) inferior ones distinct, upper ones 

 aggregated and confluent; fruit ovate, acuminated, winged, bidentate 

 somewhat longer than the ovate glume. 



HAB. Marshes. June, '!{.; culm obtusely triang. ; spikes sub S'lobose , 

 glumes rigid. 



C. cristata : spikes numerous, (87-16,) aggregated into a kind of head ; 

 fruit ovate-lanceolate, winged, diverging, serrate, longer than the 

 ovate-lanceolate glume. 



HAB. Wet thickets. June, 7|.; spike crowded into an ovate head. 



C. festucacea : spikes obovate, (5 8,) subapproximate, bracteate ; fruit 

 roundish-ovate, rostrate, bidentate, winged, serrulate on the margin, 

 longer than the ovate-lanceolate glume. 



HAB. Woods and meadows. May, Tj- ; fruit green or silver-gray, 

 not becoming tawny. 



C. scirpoides : spikes 4. ovate, obtuse, approximate, uppermost one cla- 

 vate ; fruit ovate, bidentate, plano-convex, erect and a little spreading, 

 but not reflexed, subcordate, serrulate, longer than the ovate obtuse 

 glume. 



HAB. Meadows. May, 2J. ; culm 6 12 inches high, strict ; fr. 

 not reextd. 



