CTPERACE^. 



417 



34. C. tk'nf.ra. Dew. C. adjnsta. Boott. 

 Spike compound, recurved ; spikelets about 5, obovate, reniotish, alternate, 



sessile, brownisli, attenuated below, the lowest bracteate ; /rwj^ ovate, com- 

 pressed, somewhat winged, rostrate, nerved, ciliate-serrate, longer than the 

 oblong-lanceolate scale ; stem 15 — 30 inches high, small and slender, erect, 

 with a nodding spike, longer than the leaves. Light green. Common. 



35. C. kkstijca'cf.a. Sckk. 



Spikdets 5 — 8, obovate and clubform, sessile and alternate, approximate, 

 lower one bracteate ; pe.ricr. roundish-ovate, rostrate, winged, striate, 2-tooth- 

 ed, scabrous on the margin, longer than the ovate, lanceolate glume ; stem 

 1.5 — 30 inches high, erect and stiff, leafy below. Plant pale green. Spikelets 

 greenish to brown. Common in fields, but not abundant. The clubform 

 spikelets from the decurrent scales of the staminate flowers, especially mark 

 this species. 



36. C. MiRABiLis. Dew. 



Spikeleis 7 — 1 1 , ovate-globose, alternate, sessile, often closely aggregated, 

 and stiff-form, bracteate below ; perig. ovate, sublanceolate, scabrous on the 

 margin, concavo-convex, rostrate, 2-toothed, subdiverging, scarcely twice 

 longer than the ovate, lanceolate glume ; stun 18 — 3G inches high, erect, stiff, 

 rough above, rather slender ; plant light green. Common about fences and 

 hedges, and has a specially rigid appearance. 



37. C CRISTATA. ScllW. 



Spikdets 6—14, globose, sessile, closely aggregated into a head, of a crested 

 form, bracteate ; peritr. ovate, oblong, compressed, winged, rostrate-acuminate, 

 bifid, concavo-convex, scabrous on the margin, longer than the oblong, lanceo- 

 late glume ; stem 1 — 3 feet high, acutely triangular. Plant yellowish green. 

 Common in fields and meadows on colder soils. 



38. C. tenuiflo'ra. Wahl. 



Spi'.elets 2 — 3, ovate, clustered, sessile, alternate, lower one bracteate; 

 perig. ovate-oblong, acutish, plano-convex, equaling the oblong-ovate, hyaline 

 or white glume ; stem a foot or more high, slender, subprostrate, longer than 

 the flat and narrow leaves. Light green. Spikelets whitish. Burlington and 

 Salem, Vt., in swamps, Rohbins; Oriskany and Ogdensburg, N. Y. Kneirs- 

 kern; Southampton, Mass. Chapman. 



C. Stamens and Stigmas on separate spikes. 

 1, Sta)7iinate spike single. 



39. C. au'rea. JVutt. C. pyriformis. Sckw. 

 Staminate spike short, cylindric, pedunculate ;, pistillate spikes 3, oblong, 



loose-flowered, subpendulous, exsertly pedunculate, subapproximate, bracte- 

 ate ; perig. globose, obovate, or pear-forin, obtuse, nerved, entire at the mouth, 

 longer than the ovate, acute or short-mucronate glume ; stem 3 — 10 inches 

 high, slender, often subprocumbent. Plant glabrous, green. Common in wet 

 grounds. 



40. C. saxa'tilis. L- 



Stamin'ite spike oblong, thick ; pistillate spikes 2 or 3, oblong, obtuse, sessile, 

 lower pedunculate ; perig. elliptic, plano-convex, obtuse, short-rostrate, about 

 equaling the oblong and obtuse glume ; stem 6 — 10 inches high, erect, with 

 long and leafy sheaths and bracts. Spikes nearly black. White Mts., N. H, 

 Barralt; Woods, Vt. Pursh. 



41. C. co'ncolor. R. Br. 



Staminate spike erect, cylindric ; fertile spikes 2 — 3, erect, subsessile, 

 cylindric ; pcritr. oval, entire, smooth, mucronate, about equal to the oblong 

 and obtuse glume; stem 10 — 15 inches high, smooth, leafy below ; bracts 

 auriculate ; staminate spike sometimes pistillate above. White Mis., N. H. 

 Boott. Closely related to C. ccespitosa L. but has a smooth stem; scales of 

 light color. 



