Obdbr 166.— CTPBEAOB^. 753 



— K. Eng. and N. T. Common in wet places. (C. sphaerostaohya Dew., Ed. X 

 0. oanescens |8. vitilis, Carey. C. vitilis Fries., &c.) 



34 C. Deweyana Sohk. (B. t. 69.) Spikelets about 3, sessik, ovate-kmceolaU, 

 alternate, subremote, higiiest bracteate ; perig. oblong-lanceolate, 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, subprocumbent, with 

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

 borders of woods. 



35 C. trisperma Dew. (B. t. 78.) Spikelets about 3, remote, Bessilo, 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 hyaline glurae; st. 10 — 24' high, prostrate or recurved, 

 filiform, slender, longer than the leavra. — In tufts, in marshes or wet woods • 

 common in N. Eng. and N. T. 



36 C. argyr^ntha Tuckm. MS. 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 beak, equaling the membran. 

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

 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, sessUe, alternate, 

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

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

 trate, longer tlian the flat and narrow leaves. Light green. Spikelets whitish. — 

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

 Y. (Kneiskern), Southampton, Mass. (Chapman). 



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

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

 serrulate, scarcely longer than the 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 Toit. Spike composed of4to 8 spikelets, ovate, large, approximate 

 and se.S3ile ; perig. I'oundish, sometimes obovate, nearly flat and close, abruptly 

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

 the beak, sliorter than the lance-ovate glume ; eulm smooth, 3 to 4f high ; Iva. 

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



40 C. straminea "Wahl. S2>ike compound, erect ; spikelets about 6, ovate, short- 

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

 pressed, ciliate-serrate on the margin, acuminate-beaked, 1-veined on the back, 

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

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

 in woods and fields. (C. festucacea Ell. ? nee Sohk.) 



u. DEEvron Dew. Spikelets 3 — 5, often closely apijroximate, and more 

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

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



. denow. 



p. MINOR Dew. Spikelets small, 5 — 6, globous or obovate, less approximate ; 

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

 ovate, acute glume. 



41 C. lohnea lluhl. Spike compound, 5 to 10 ovate spikelets, aggregated above ; 

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

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

 plant glaucous. — Penn. (Muhlenberg) and salt marshes, E. I. (Olney). 



42 C. mirabilis 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-topthed, subdiverg- 

 ing scarcely twice longer than the ovate, lanceolate glumo; st. 18 — 36', erect, 



48 



