ORDER 156. CYPERACEJS. 759 



diverging, veined, glabrous, abruptly contracted to a small, round, bifurcate beak, 

 alUtle longer than the lanceolate glume; culm 20 to 30', obtuse-angled, with long 

 Ivs. and bracts ; light green. Marshes over the country, not abundant 



180 C. monile Tuckm. (B. t. 71.) $ Spikes 2 to 4, long-cyl., slender, with 

 long-lanceolate gla. ; 2 spikes 2 or 1, loug-cyl., short-ped., rather loose, tapering 

 below sometimes and more loose, remote, erect, bracteate ; perig. globous or ellip- 

 soid, inflated, short- rostrate, bidentate, yellowish, many-veined, more than twice 

 longer than the oblong-lane, gl.; culm 15 to 30', erect; Ivs. and bracts long, bright 

 green. Marshes, not abundant, N. Eng. to 0. and westward. 



181 C. Olneyi Boott (t. 40.) $ Spikes about 3, cyl., slender, near ; 5 spikes 

 commonly 2, cyl., thick, dense, yellowish, approx. more or less ped., the lowest 

 tapering below, more lax at the base, often some nodding and bracted ; perig. in- 

 flated-ovoid, with, a short, cyl., scabrous, bifurcate beak, diverging, longer than the 

 lane. gl. ; culm 15 to 22', stout, obtuse-angled, rough above, shorter than the 

 long, stiff, white-edged Ivs. R. I. (Olney). 



182 C. Tuckennani Boott (t. 38). $ Spikes 23, cylindric, lower ones sessile 

 and short, with an oblong, acutish glume ; 2 spikes 2 3, oblong, cyl., thick and 

 large, scarcely pedunculate, subloose-flowered ; perig. much inflated, ovate, large, 

 conic, costate, bifurcate, all glabrous, nerved, twice longer than the ovate-lane. 

 gL ; culm about 2f, erect, scarcely scabrous ; bracts and Ivs. long, not wide ; light 

 green. Wet places in meadows, common, and has been ranked under C. bul- 

 lata. Distinguished from No. 181, by the short, smooth beak of its membranous, 

 pellucid perig. as well as by its different ? spikes. 



183 C. vesicaria L. $ Spikes about 3, erect, oblong; 2 spikes 2 3, cyl., 

 erect, dense-flowered, alternate, long-bracteate ; perig. ovate, oblong-conic, terete, 

 inflated, rostrate, nerved, diverging, glabrous, bicuspidate, nearly twice longer 

 than the oblong-lane. gL ; culm about 2f, shorter than the Ivs. Bright green. 

 Marshes. Not common. 



184 C. bullata Schk. { Spikes 3, erect, slender, cyl., with oblong-lanceolate 

 glumes ; $ spikes 2 3, rather oblong, cyl, nearly erect ; perig. ovoid-globous, in- 

 ilated, glabrous, costate, with a long, scabrous beak, bifurcate, longer than the 

 lane. gl. ; culm 20 30' high, rather slender, triquetrous, scabrous above, leafy 

 and shorter than the leaves. Glabrous, light green. In wet meadows. Com- 

 mon. This is C. bullata as described in Sill. Jour., Vol. ix. p. 71, and named by 

 Schk. from its (ball-shaped) globous perigynium, comporting with hia fig. 166. 

 Carey and others have adopted another form under that name, which hero follows, 

 named from the inflation of the fruit. 



185 C. physema Dew. <5 Spikes 2 or 3, cyl., slender, contiguous, the lowest 

 bracteate; 2 spike 1, rarely 2, subrotund or oblong-cyl, thick, dense-flowered, re- 

 mote, yellowish, the lowest ped., at length nodding, with a bract leafy and surpass- 

 ing the culm ; perig. turgid-ovate, with a long, cyl., scabrous beak, divaricate, in- 

 flated, glabrous, broader and longer than the lanceolate, acute, white-edged gl. ; 

 culm 12 to 24', slender, firm, shorter than the narrow, flat, firm, light green Ivs. 

 X. Eng. to Penn., in humid meadows. (C. bullata Boott, t. 39, nee Schk.) 



186 C. oligosperma Michx. S Spikes several, sometimes one, erect, slender, 

 long-cyl., with an oblong, obtusish gl. ; 2 spike-s 1 3, ovate, globular, sessile, 

 distant ; perig. few, ovate, inflated, acute, nerved, short -rostrate, entire at tho 

 orifice, glabrous, a little longer than the ovate-lane, gl. ; culm 1 2f, scabrous 

 above, leafy below ; Ivs. involute and rush-like, light green. Marshes and lake 

 borders, Can., N. Eng., N. Y., Mich, and Ga. 



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