372 OUPEK 154. CYPEKACE^E. 



lance-ovate, 1J-", twice longer than the glume ; culm acutely 3-angled with concave 

 sides, leaves nearly a? long (2 3f ). Marshes : common. 



23 C. Crus-Corvi Shuttl. Spike decompound or Bub-panicled, 3 6': perig. short- 

 ovate, very long-beaked (3"), spreading; glume 1"; culm 2 3f; Ivs. linear, flat, many 

 aud long. River swamps, Wis. to O.. and Fla. 



24 . ceplialopliora Willd. Head 6 12" long, dense; peris;, broad-ovate, short- 

 beaked. scarcely longer than the ovate-acuminate glume ; style vt ry short, bulbous at 

 the base ; Ivs. copious, equaling the slender culm (If). (C. Leavunworthii Dew.) 



25 C. :! iiliU-iiberjiii Schk. Head ovoid-oblong, 1'; perig. broad-ovate, short 

 beaked, strongly nerved, twice larger OJ") than in No. 21; nut orbicular, style short, 

 bulbous ; culm 1 2f, Ivs. shorter, bracts setaceous. la fields, not abundant. 



26 C. cliordorlilza Ehrh. Head ovoid, 9 15", perig. ovate, nerved, turgid, at 

 length brown, few and large (2"), beakless but minutely pointed; rhizome creeping; 

 leaves short and narrow, culms 9 15'. Marshes, N. Y. to Wis., and N. 



27 C. ceplialoidea Dew. Spikelets very short, spike 1 1J'; perig. brown (at ma 

 turity). acuminate, nerveless, ovate, shorter than the thin cuspidate glume. Culm 2 4f. 

 Leaves elongated. Fields, hedges, N. Y. (Penn Yan, Sartweil), and W. 



28 C. murioatii L. Spikelets ovoid, often a little remote ; perig. ovate-lanceolate, 

 nerveless, wingless, some longer than the ovate-lauceolate gl. Ms. to N. J., and W. 



29 C. sparganloides Muhl. Spikelets 7 10, ovate ; perig. ovate-acuminate, nearly 

 twice longer than the glumes, all green. Culm ana leaves 2f. Infields: common. 



ft. i iiinm, is a luxuriant form, with the spike large (3 4'), panic-led. 

 ' y. minor, is a small and delicate form, with the spike 12' long. 



30 C. rosea Schk. (Fig. 10) Spkl. 58, remote, 8-10-flwd.; perig. (Fig. 17) lance-obloiig, 

 divrrginj- or rcflexed. twice as long as the ovate obtuse glume (Fig. IS). 8 16'. Com. 



ft. ii.ii.tr. Spkl. 4 6, quite remote; perig. fewer and suberect. 



y. mil fta. Spkl. about 3-tlwd., perig. oblong, acute. Stem and leaves setaceous. 



31 C. retroflexa Muhl. Spkl. 35, bracteate, stellate at maturity; perig. 3 6, 

 ovate, acutish. spreading or reflexed, about equaling the acute glume. Woods. If. 



32 C. tenella Schk. Spkl. 3 or 4, near, erect; perig. 1 3, mostly 2, ovate-obtuse, 

 minutely pointed, brown, smooth, little exceeding the hyaline, ovate, acute gl. In 

 tufts, very slender and flexile, 5-12'. Woods, N.Kng. to Pa., and W*. (C.dispermaDew.) 



33 C. stellulata. L. Culm stiffly erect, 8 24'; spikelets 4 6, ovate, sessile, the 

 vpike nearly 2', turning blown ; perig. broad-ovate, short-beaked, a little longer than 

 the ovate, obluse glume. Wet places, N. 



34 C. sclrpoides Schk. Culm very slender, 612' ; spkl. 3 4, contiguous, spk. 1', 

 light green ; perig. ovate-lanceolate, near twice longer than the ovate-lanceolate, 

 acute glume. Wrt. Common. Stain, mostly below the upper spikelet. 



35 C. trlfupernia Dew. Very slender. If ; spikeleis 13. with long r-etaceoiis bracts, 

 about 3-flwcl. ; pt rig. oblong, pointed, little longer than ihe irlume. Pa.. \. and W. 



36 C. Deweyi Schk. Slender, leafy, 1 2f; t-pikelets 3- 5, 3-9-ttwd., the upper ap- 

 proximate ; perig. oblong-lanceolate, rostrate, 2-toolhed. mostly longer than the 

 ovate-lanceolate awned hyaline glume. Woods, N. Eng. to Wis., and Canada. 



37 C. caitescens L. Erect, 2f, glaucous; epkl. 5 7, ovate-oblong, remote below. 

 1 -.2-20-11 wd.: perig. round-ovate, toothless, eq. the glume. Wet. Coin. (C. curia Uood.) 



38 . vitllitt Fries. Slender, ttexuous, 1 3f; spkl. 3 5. separate, shon-ov<>id. 5-1(1- 

 Bwd. ; perig. lance-ovate, pointed, longer than the glume. N. Eng., W. and N. 



S' C. Norrtgica Schk. Yellowish, 6 12', erect; spkl. about 3, 5-12-fhvd., the up- 

 per often all t ; perig. oval, biconvex, veiny, brown, eq. the obtuse glume. Me. {li!ake.} 



io C. Llddoul Boott. Spike 12', of 5 7 oblong spikelets ; perig. and gl. liiiire- 

 ovate, brownish, equal, the latter white-edged ; culm strict, 1 2f. Mich, (t'ooleyt, & \. 



41 C. teimiflbra Wahl. Spike capitate, J', of 2 or 3 roundish, about 5-flwd. spkls ; 

 pong, oblong-ovite. plano-convex, acute, equaling the oblong glume. Swamps, N. 



42 C. sychiiocepliata Car^y. SpkL. ovoid, in a dense head with long leafy bractf.; 

 perig. 2i", lance-linear, gradually long- beaked, the gl. nearly as long. N. Y. : rare. 



