754 ORDER 155. CYPERACE^E. 



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

 hedges, and has a specially rigid appearance. (C. f'estucacea ft. Torr. Carey.) 



43 C. cristata Schw. Spikelets 614, globous, sessile, closely aggregated into 

 an oblong, thick head of a crested form, bracteate ; perig. ovate, oblong, compressed, 

 winged, rostrate-acuminate, bifid, concavo-convex, scabrous on the margin, longer 

 than the oblong, lanceolate glume ; st. 1 3f, acutely triangular. Plant yellow- 

 ish-green. Common in fields and meadows on colder soils. (C. lagopodioides (3. 

 Carey.) 



44 C. lagopodioides Schk. Spikelets 8 20, beakless, green, ovate, rather 

 near, alternate and sessilk ; perig. round-lanceolate, tapering at loth ends, concavo- 

 convex, nerved, bidentate, scabrous on the margin, nearly twice as long as the 

 ovate-lanceolate glume ; st. nearly 2f, leafy ; the whole light green. Common. 

 (C. scoparia, ft. Torr.) 



45 C. tenera Dew. Spike com pound, recurved ; spikelets about 5, obovate, remotish, 

 alternate, sessile, attenuated below, the lowest bracteate ; fr. tawny, ovate, com- 

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

 long-lanceolate scale ; st. 15 30', small and slender, erect, with a nodding spike, 

 longer than the leaves. Light green. Common. (C. straminea ft. Torr. C. 

 festucacea 'ft. Carey. The inconsistency of these synonyms favors our own view 

 of this species.) 



46 C. festucacea Schk. Spike erect; spikelets 5 8, obovate and clubform, ses- 

 sile and alternate, approximate, lower one bracteate ; perig. tawny, roundish-ovate, 

 rostrate, winged, striate, 2-toothed, scabrous on the margin, longer than the OTjate, 

 lanceolate glume ; st. 15 30', erect and stiff, leafy below. Plant pale green. 

 Spikelets greenish to brown. Common in fields, but not abundant. The club- 

 form spikelets from the decurrent scales of the $ flowers, especially mark this 

 species. 



47 C. adiista Boott. Spikelets several, 4 to 8 or more, often not approximate, 

 tapering below in maturity; perig. ovate-lanceolate, or ovate, long-rostrate, nar- 

 row-winged and serrulate, veined, scarcely bifid, as long and broad as the glume ; 

 culm 15 to 24', leafy towards the base. R. I. (Olney) to L. Sup. and Brit. Am. 



48 C. scoparia Schk. Spikelets 5 10, usually 5 7, ovate, sessile, approximate, 

 the lowest with a long, deciduous bract ; perig. ovate-lanceolate, nerved, erect, 

 slightly margined, glabrous, longer than the lanceolate, acuminate glume; st. 

 18 24', leafy towards the root. Moist places, very common. (C. ovalis Ell.) 



ft. AGGREGATA Dew. 'Spikelets aggregated into a head, somewhat spiral. 



49 C. sychnocephala Carey. Spikelets ovate, closely aggregated into a head 

 (as the name purports), sessile, slender, with long, leafy bracts; perig. ovate, very 

 long, lanceolate, or tapering into a long beak, with scabrous edges, a little longer than 

 the lance-ovate glume; plant short and very pale green. X. T., Jefferson Co. 

 (Boott. 111., Ill), at Little Falls (Vasey, Kneiskern). Remarkable for its slender, 

 beaked fruit. 



50 C. arida Schw. and Torr. Spikelets . oval-oblong, 5 10, somewhat tapering at 

 both ends, large and approximate, close -flowered, dry and chaff-like ; perig. lance- 

 linear, compressed, thin, distinctly winged, bideutate, nerved, acuminate, twice 

 longer than the ovate-lanceolate glume ; plant light green in all its parts. Com- 

 mon in Ohio and Mich., 18 36', and further W. and S. (C. Muskingummensis 

 Schw., scoparia, ft. Torr.) 



51 C. miliaris MX. (B. t. 187.) Culm erect, slender, rough above; Ivs. flat, 

 very narrow; $ spike sessile, sometimes 2 and distant, ovoid, tawny; bract seta- 

 ceous, short; $ spike pale, rather long-peduncled ; perig. spheroidal, smooth. 

 Marshes, Can., especially at L. Mistassins. 



52 C. Floridana Schw. $ Spike short and sessile ; 5 spikes 2 to 4, approxi- 

 mate, ovate, sessile, bracteate, the lowest sometimes a little recurved; perig. ob- 

 long, tapering below, rather obovate, plano-convex, abruptly rostrate, short-bifid, 

 scabrous above and on the back, about as long as the ovate-oblong, red-edged, scab- 

 rous, cuspidate glume culm 2 to 6', slender, 3-sided; Ivs. radical, flat, twice to 

 thrice longer than the culm ; plant pale green ; ach. oval, lens-shaped. Fla. to La. 



