Obdeb 156.— OYPEBACB^. V53 



— ^IT. Bng. and N. T. Common in wet places. (C. sphaarostaohya Dew., Ed. 2. 

 0. oanescens p. vitilis, Carey. C. vitilis Fries., &o.) 



34 C. Dewey^a Selik. (B. t. 69.) Spikelets about 3, sessile, ovate-lanceolaie, 

 alternate, subremote, highest bracteate; perig. oblong-kmceolate, rostrate, acumi- 

 nate, bifurcate, plano-convex, slightly scabrous on the margin, a little longer than 

 the ovate-lanceolate, awned, hyaline glume ; st. 1 — if long, subprocumbenfc, with 

 radical leaves ; wliole plant yellowish-green. Common ia open woods or on the 

 borders of woods. 



35 C. trisperma Dew. (B. t. VS.) Spilcelets dbovi 3, remote, sessile, alternate, 

 highest ebracteato ; perig. ovate-ohhng, acute or short-rostrate, plano-convex, at 

 the orifice entire, nerved, subscabrous on the edges, somewhat diverging, longer 

 than the oblong, acute, and hyaline glv/me; st. 10 — 24' high, prostrate or recurved, 

 filiform, slender, longer than the leaves. — In tufts, in marshes or wet woods ; 

 common in N. Eng. and N. T. 



36 C. argyrSntha Tuclcm. M S. Spike compounded of spikelets 5 to 8, roundish, 

 obovate, alternate, subaggregated above, rounded below, with squarrous bracts, 

 except the lowest, which has a long, leafy point ; perig. ovate, compressed, at 

 length spreading, green, many-veined both sides, and winged by a wide margin, 

 lacerated above, glabrous, acuminate in a short, bifid bealc, equaling the membran- 

 ous, white, lanceolate, acute glume. — Amherst and Sunderland, Mass. (Tuclser- 

 man.) Culm 1 to 3f high, weak, obtuse-angled, twice longer than the lance-lin- 

 ear leaves. 



37 C tenuiflora "Wahl. Spikelets 2 — 3, ovate, clustered, sessile, alternate, 

 lower one bracteate; perig. ovate-oblong, acutish, plano-convex, equaling the 

 oblong-ovate, hyaline or white glume ; st. a foot or more high, slender, subpros- 

 trate, longer than the flat and narrow leaves, light green. Spikelets whitish. — 

 Burlington and Salem, Vt, in swamps (Robbins), Oriskany and Ogdensburg, N. 

 T. (Kneiskern), Southampton, Mass. (Cliapman). 



38 C. Liddoni Boott. (Illus. 51.) Spikelets 5 — 1, oblong-ovate, closely aggre- 

 gated ; ,perig. ovate, lanceolate, acuminate, oblique at the orifice, glabrous, margin 

 serrulate, scarcely longer than tlie ovate-lanceolate glume, which is acute and 

 hyaline on the edges ; perig. and glumes rather chestnut brown ; plant yellowish- 

 green. — Brit. Am. (Boott.) Mich. (Cooley). 



39 C. alata Torr. Spike composed of 4 to 8 spikelets, ovate, large, approximate 

 and sessile ; perig. roundish, sometimes obovate, nearly flat and close, abruptly 

 short-beaked, 3-veined on the back, 2-toothed, broadly winged, finally scabrous on 

 the beak, shorter than tlie lance-ovate glume ; culm smooth, 3 to 4f high ; Ivs. 

 rough-edged and pale green. — N. Car. to Ma. 



40 C. straminea 'Wahl. Spike compound, erect ; spikelets about 6, ovate, short- 

 oblong, alternate, sessile, subapproximate ; perig. broad, roundish-ovate, com- 

 pressed cili'ate-serrate on the margin, acuminate-beaked, 1-veined on the back, 

 2-toothed, widely winged, commonly shorter than the ovate-lanceolate glume , 



s(_ 12 20' high, longer than the leaves; spikelets whitish or tawny. — Common 



in woods and°fields. (C. festuoacea Ell. ? nee Schk.) 



a. BBEVIOB Dew. Spikelets 3 — 6, often closely approximate, and mora 

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

 the ovate-lanceolate glume. — This is the plant originally described by "Will- 



denow. 

 ;8. MINOE Dew. Spikelets small, 5 — S, globous or obovate, less approximate ; 

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



ovate, acute glume. 



41 C. foSnea Muhl. Spike compound, 5 to 10 ovate spikelets, aggregated above ; 

 perig. ovate-acuminate, winged, scabrous-margined, large and close, 2-toothed, 

 about equal to the oblong-lanceolate glume ; culm large and smooth, leafy below j 

 plant .glauop,us.—-?6nu. (Muhlenberg) and salt marshes, R. I. (Olney). 



42 C. mirdbilis Dew. Spikelets 1 — 11, ovate-globous, alternate, sessile, often 

 closely aggregated into a lance-ovoid head, bracteate below ; perig. ovate, sublan- 

 ceolate, scabrous on the margin, concavo-convex, rostrate, 2-toothed, subdiverg- 

 ine scarcely twice longer than the ovate,, lanceolate glume; «*. 18-:-36', erect, 



48 



