CYPERACE^. 416 



26. C. sciRpoiTJES. Schk. 



Spikelets about 4, ovate, approximate, sessile, obtuse, lowest bracteate ; 

 perig. ovate, cordate, compressed, lanceolate or rostrate, scabrous on the 

 margin, diverging or horizontal, longer than the ovate-lanceolate, acute glume; 

 stem G — IG inches high, leafy towards tiie base. Wet places in the country. 

 The more lanceolate fruit and glume, and more flexible stem, separate it I'roin 

 the preceding. C. scirpuides has the stamens chiefly below the upper spikelet. 



27. C. CURT A. Good. 



Spikelets 4 — 7, ovate-oblong, upper subapproximate, lower often remote; 

 perig. round-ovate, acutish, obtusish, diverging, convexo-concave, 2-toothed, 

 slightly scabious, longer than the ovate, white, hyaline glume ; stim 1 — 2 feet 

 high, usually light green, with silvery or hoary spikelets. Moist places over 

 the country. 



28. C. sphjErostachya. Deio. C. canescens, /3 sphseroslachya. Tuck. 

 Spikelets 3 — 4, ovate, roundish, remote, sessile, few fruited, 2 — G ; perig. 



ovate-lanceolate or roundish rostrate, longer thnn the ovate and hyahne white 

 glume ; stc7n 1 — 2 feet high, slender, flaccid, subrostrate, and with the leaves, 

 green. Common in N. England, and N. York, in wet places. 



c. Ovale-lanceolate spikelets j few-fruited. 



29. C. Deweyana. Schk. 



Spikelets about 3, sessile, ovate-lanceolate, alternate, subremote, highest 

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

 convex, slightly scabrous, on the margin, a little longer than the ovate-lanceo- 

 late, awned hyaline glume ; stem 1 — 4 feet long, subprocumbent, with radical 

 leaves ; whole plant yellowish green. Common in open woods or on the 

 borders ol' woods. • 



30. C tkisperma. DciB. 



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

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

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

 acute and liyaline ffluine; stem 10 — 24 inches 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. scopa'ria. 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 ; stem IS — 24 

 inches high, leafy towards the root. Moist places, very common. 



fi- aggregata \Dew.) ; spikelets aggregated into a head, somewhat spiral. 



32. C. lagopodioi'des. Schk. 



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

 lanceolate, ta])ering at both ends, concavo-convex, nerved, bidentate, scabrous 

 on the maioin, nearly twice as long as the ovate-lanceolate glume ; stem 

 nearly 2 feet high, leafy; the whole light green. Common. 



33. C. strasii'nea. JVahl. 



Spike con\pound, erect; spikelets about G, ovate, short-oblong, alternate, 

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

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

 than the ovate-lanceolate glume ; stem, 12 — 20 inches high, longer than the 

 leaves; .fpikclits whitish or tawny. Common in woods and fields. 



a. hrcvioT {Dew.) ; spikelets 3 — 5, often closely approximate, and more nearly 

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

 ovate-lanceolale glume. This is the plant originally described by Willdenow. 



/3. minor {Dew.) ; spikelets small, 5 — G, globose or obovate, less approxi- 

 mate ; perig. small, ovate, acuminate, less winged, serrulate, about equaliug 

 the ovate acute glume. 



