372 ORDER 154 CYPERACE^E. 



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

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



23 C. Crus-CorvI Shuttl. Spike decompound or sub-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, ceplialopliora Willd. Head 612" long, dense ; perig. broad-ovate, Bhort- 

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

 the base; Ivs. copious, equaling the slender cnlm (If). (C. Leaven worthii Dew.) 



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

 beaked, strongly nerved, twice larger (If) 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, culms 915'. Marshes, N. Y. to Wis., and N. 



27 C. ceplialoidea Dew. Spikelets very short, spike 1 !$' ; 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. muricata L. Spikelets ovoid, often a little remote ; perig. ovate-lanceolate, 

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



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

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



/3. rm*, is a luxuriant form, with the spike large (3 4'), panided. 

 y. minor, is a small and delicate form, with the spike 1 2' long. 



30 C. rosea Schk. (Fig. 16) Spkl. 58, remote, 8-10-flwd.; perig. (Fig. 17) lance-oblong, 

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



/3. miner, Spkl. 4 6, quite remote ; perig. fewer and suberect. 



y. raditila, Spkl. about 3-fiwd., 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. 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.ISng.to Pa., and VV. (C.dispermaDew.) 



33 C. stellulata. L. Culm stiffly erect, 824'; spikelets 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, 612' ; spkl. 34, 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. trisperma Dew. Very slender. If ; spikelets 1 3, with long setaceous bracta, 

 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. 



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

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



38 C. vi tills 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. 



3D C. Noriregica Schk. Yellowish, 6 12', erect ; spkl. about 3, 5-12-flwd., the up- 

 per often all $ ; perig. oval, biconvex, veiny, brown, eq. the obtuse glume. Me. (Blake.} 



40 C. liiddoui Boott. Spike 12', of 5^-7 oblong spikelets ; perig. and gl. lance- 

 ovate, brownish, equal, the latter white-edged ; culm strict, 1 2f. Mich. (Cooley), & N. 



41 C. teuuiflora Wahl. Spike capitate, f, of 2 or 3 roundish, about 5-flwd. spkls ; 

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



42 C. sychnocephala Carey. SpkL ovoid, in a dense head with long leafy bracts; 

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



