372 ORDER 154. CYPERACE^E. p 



lance-orate, 1$", twice longer than the glume ; culm acutely 3-angled with concare 

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



23 C. Crus-Corvi Shuttl. Spike decompound or eub-panicled, 36': perig. short- 

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

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



24 C. cephalopliora Willd. Head 6 12" long, dense; perig. broad-ovate, short- 

 beaked, scarcely longer than the ovate-acuminate glume ; style very short, bulbous at 

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



25 C. Muhlenbergii Schk. Head ovoid-oblong, 1'; perig. broad-ovate, short- 

 beaked, strongly nerved, twice larger (H") than in No. 24 ; nut orbicular, style short, 

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



26 C. cliordorliiza Ehrh. Head ovoid, 915", perig. ovate, nerved, turgid, at 

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

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



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

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

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



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

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



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

 twice longer than the glumes, all green. Culm and leaves 2f. In fields : common. 



/3. rameKy 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. 16) Spkl. 5 8, remote, 8-10-flwd.; perig. (Fig. 17) lance-oblong, 

 diverging or reflexed, twice as long as the ovate obtuse glume (Fig. 18). 8 16'. Com. 



/3. minor. Spkl. 46, quite remote ; perig. fewer and suberect. 



y. radial a. Spkl. about 3-flwd., perig. oblong, acute. Stem and leaves setaceous. 



31 C retroflexa. Muhl. Spkl. 3 5, bracteate, stellate at maturity; perig. 3 6, 

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



32 C. tenella Schk. Spkl. 3 or 4, near, erect; perig. 13, 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 VV. (C.dispermaDew.) 



33 C. stellulata L. Culm stiffly erect, 824'; epikelets 46, ovate, sessile, the 

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

 the ovate, obtuse glume. Wet places, N. 



34 C. scirpoides Schk. Culm very slender, 6 12'; spkl. 3 4, contiguous, spk. 1', 

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

 acute glume. Wet. Common. Stam. mostly below the upper spikelet. 



35 C. trigperma Dew. Very slender. If; spikelets 13, with long setaceous bracts, 

 about 3-flwd. ; perig. oblong, pointed, little longer than the glume. Pa., N. and W. 



36 C. Deweyi Schk. Slender, leafy, 1 2f; spikelets 3 5, 3-9-flwd., the upper ap- 

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

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



3 7 C. canescens L. Erect, 2f, glaucous ; spkl. 57, ovate-oblong, remote below, 

 12-20-flwd.; perig. round-ovate, toothless, eq. the glume. Wet. Com. (C. curta Good.) 



38 C. vitilis Fries. Slender, flexuous, 1 3f; spkl. 3 5, separate, short-ovoid, 5-10- 

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



8!> C. Norvegica Schk. Yellowish, 612', erect; spkl. about 3, 5-12-flwd., the up- 

 per often all $ ; perig. oval, biconvex, vo.iny, brown, eq. the obtuse glume. Me. (Blake.) 



40 C. Liddoni Boott. Spike 12', of 57 oblong spikelets ; perig. and gl. lance- 

 ovate, brownish, equal, the latter white-edged ; culm strict, l-2f. Mich. (Cooley), & N. 



41 C. tenuiflora Wahl. Spike capitate, $', of 2 or 3 roundish, about 5-flwd. spkla ; 

 perig. oblong-ovate, plano-convex, acute, equaling the oblong glume. Swamps, N. 



42 C. } cliiioct-pliiiJa Carey. Spkl. ovoid, in a dense head with long leafy bract*; 

 perig. 21", lance-linear, gradually long-beaked, the gl. nearly as long. N. Y. : rare. 



