MONOECIA.— TRIANDRIA. 337 



acuminate, somewhat gibbous at the base, biden- 

 tate, ciliate-serrulate on the margin. 

 HAB. Bogs. May. tt . Culm 18 in. high ; spike 

 narrow ; fr. and glume brown. 



2. With 3 stigmas. 



19. C. pedunculata : spikes about 4, on long peduncles., 



very remote ; fruit obovate, triquetrous, obtuse, 

 smooth, entire at the orifice ; glumes ovate, mu 

 cronate, (purple and green.) 

 HAB. Rocky hills. May. U-. Culm filif., 6 in. 

 high ; pedunc. mostly radical. 



20. C. ovata: spikes about 5, pedunculate, ovate, pen- 

 dulous ; fruit obovate, acute ftt each end, as long 

 as the ovate acute glume. 



HAB. Canada. U. Spikes densely imbricate; 

 glumes brown. 



C. Summit pistilliferous. 



1. With 2 stigmas. 



21. C. Dewey ana: spikes about 3, sessile, loose, two 

 of them approximate, the third distant, with long 

 bracts at the base, (except the highest ;) fruit ob- 

 long-lanceolate, subcompressed, rostrate, bifid at 

 the point ; beak serrulate ; culm flaccid. 



HAB. Woods. June. W- . Culm 1—4 ft. high, 

 subprccumb. ; plant yell. -green. 



22. C. loliacea : spikes about 4, rather distant, few-flow- 



ered : fruit elliptical, obtuse, nerved, compressed, 

 erect. 

 HAB. Swamps. June. U. Culm 2 ft. high, 

 slend. ; spik. 3 — b-fl. 



13. C. trisperma : spikes 3, remote, alternate, sessile, 

 ovate, uppermost one without a bract ; fruit ob- 

 long, acute (or short-rostrate) entire at the point, 

 many-nerved, subscabrous above, somewhat di- 

 verging, longer than the oblong acute hyaline 

 glume. 

 HAB. Mountain bogs. June. U. Culm 18 in. 

 high ; filif, prostr. ; plant pale green. 



24. C. arida: spikes 8, (large) subapproximate, dry; 

 fruit elliptical, compressed, winged, terete in the 

 F f 



