580 CLX. CYPERACE^E. CAREX. 



bracteate ; perig. oblong-lanceolate, rostrate, acuminate, bifurcate, plano-con- 

 vex, slightly scabrous on the margin, a little longer than the ovate-lanceolate, 

 awned, hyaline glume; st. 1 4f long, subprocumbent, with radical leaves; 

 whole plant yellowish-green. Common in open woods or on the borders of 

 woods. 



30. C. TRISPERMA. Dew. 



Spikelets about 3, remote, sessile, alternate, highest ebracteate; perig. 

 ovate-oblong, acute or short-rostrate, plano-convex, at the orifice entire, nervecl, 

 subscabrous on the edges, somewhat diverging, longer than the oblong, acute 

 and hyaline glume ; st. 1024' high, prostrate or recurved, filiform, slender, 

 longer than the leaves. In tufts in marshes or wet woods ; common in N. 

 England and N. York. 



f, Spikelets oval. 



31. 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 mar- 

 gined, glabrous, longer than the lanceolate, acuminate glume ; st. 18 24' high, 

 leafy towards the root. Moist places, very common. 

 /?. aggregata. Dew. Spikelets aggregated into a head, somewhat spiral. 



32. C. LAGOPODiolDEs. Schk. 



Spikelets 8 20, cylindric, ovate, rather near, alternate and sessile ; perig. 

 lanceolate, tapering at both ends, concavo-convex, nerved, bidentate, scabrous 

 on the margin, nearly twice as long as the ovate-lanceolate glume ; st. nearly 

 2f high, leafy ; the whole light green. Common. 



33. C. STRAMINEA. Wahl. 



Spike compound, erect ; spikekts about 6, ovate, short-oblong, alternate,- 

 sessile, subapproximate ; perig. broad, roundish-ovate, compressed, ciliate-ser- 

 rate on the margin, beaked, 2-toothed, widely winged, commonly shorter than 

 the ovate-lanceolate glume ; st. 12 20' high, longer than the leaves ; spikelets 

 whitish or tawny. Common in woods and fields. 



a. brevior. Dew. Spikelets 3 5, often closely approximate, and more nearly 

 round ; perig. shorter-ovate, and shorter-rostrate, scarcely longer than the ovate- 

 lanceolate glume. This is the plant originally described by "Willdenow. 



ff. minor. Dew. Spikelets small, 5 6, globose or obovate, less approximate ; 

 perig. small, ovate, acuminate, less winged, serrulate, about equaling the ovate, 

 acute glume. 



34. C. TENERA. Dew. (C. adusta. Boott.} 



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

 sessile, brownish, attenuated below, the lowest bracteate ; fr. ovate, compressed, 

 somewhat winged, rostrate, nerved, ciliate-serrate, longer than the oblong-lance- 

 olate scale ; st. 15 30' high, small and slender, erect, with a nodding spike, 

 longer than the leaves. LighVgreen. Common. 



35. C. FESTUCACEA. Schk. 



Spikelets 5 8, obovate and clubform, sessile and alternate, approximate, 

 lower one bracteate ; perig. roundish-ovate, rostrate, winged, striate, 2-toothed, 

 scabrous on the margin, longer than the ovate, lanceolate glume ; st. 15 30' 

 high, erect and stiff, leafy below. Plant pale green. Spikelets greenish to 

 brown. Common in fields, but not abundant. The dub-form spikelets from the 

 decurrent scales of the ^ flowers, especially mark this species. 



36. C. MIRABILIS. Dew. 



Spikekts 7 11, ovate-globose, alternate, sessile, often closely-aggregated, 

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

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

 ger than the ovate, lanceolate glume; st. 18 36' high, erect, stiff, rough above, 

 rather slender ; plant light green. Common about fences and hedges, and has 

 a specially rigid appearance. 



37. C. CRISTATA. Schw. 



Spikelets G 14, globose, sessile, closely aggregated into a head of a crested 

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



