614 CYPERACE.E. (SEDGE FAMILY.) 



2. VtGNEA. * 11. AcROARRHtx^:. +- 1. Fcetidas 



98. C. Chordorhiza, Ehrh. Very extensively stolonif erous ; culm 

 mostly erect, 1 - 1| long ; leaves involute, shorter than the culm ; perigynium 

 globular, very strongly nerved, short-pointed and entire, about the length of 

 the acute scale. Cold bogs and soft lake-borders, Vt. to Iowa, and north- 

 ward; infrequent. (Eu.) 



99. C. Stenoph^lla, Wahl. Stiff, 3-8' high ; leaves involute and shorter 

 than the culm ; perigynium ovate, flat on the inner face, lightly nerved, grad- 

 ually contracted into a short and entire rough-edged beak, tightly enclosing 

 the achene, at maturity longer than the hyaline acutish scale. Dry grounds, 

 Thayer Co., Neb. (Bessey) ; Emmet Co., Iowa (Cratty), and westward. (Eu.) 



* 11. *- 2. Vulpmce. 

 M. Beak shorter than or about as long as the body of the perigynium. 



100. C. COnjlincta, Boott. Strict but rather weak, 1|-3| high; culm 

 soft and sharply triangular or nearly wing-angled, becoming perfectly flat 

 when pressed ; leaves soft, about 3" broad ; head 1 - 3' long, interrupted, often 

 nearly green, infrequently bearing a few setaceous bracts ; perigynium lance- 

 ovate, light colored, whitish and thickened below, the beak lightly notched 

 and roughish, about equalling or a little exceeding the cuspidate scale. 

 Swales and glades, N. J., Ky., and westward ; usually rare. 



M. *-*. Beak twice the length of the body of the perigynium or longer. 



101. C. Stipata, Muhl. Stout, 1-3 high, in clumps; culm rather soft, 

 very sharp ; head 1 - 3' long, rarely somewhat compound at base, interrupted, 

 the lowest spikes often \' long ; perigynium lanceolate, brown-nerved, the beak 

 toothed and roughish, about twice the length of the body, and much longer 

 than the scale. Swales ; common and variable. 



102. C. Crus-c6rvi, Shuttlew. Stout, glaucous, 2-3 high; culm 

 rough, at least above ; leaves flat and very wide ; head much branched and 

 compound, 3 - 6' long ; perigynium long-lanceolate, the short base very thick 

 and disk-like, the roughish and very slender beak thrice the length of the body 

 or more, 3-4 times the length of the inconspicuous scale. Swamps, S. Minn 

 to Neb. and Ky., and southward ; rare northward. 



* 11. -t- 3. Multiflbrce. 

 M. Spikes conspicuously panicled. 



103. C. decomp6sita, Muhl. Stout, exceedingly deep green, l-3 

 high, in stools ; culm very obtusely angled, almost terete below ; leaves firm, 

 channelled below, longer than the culm ; head 2-4' long, the lower branches 

 ascending and 1 - 2' long ; perigynium very small, round-obovate, few-nerved, 

 hard and at maturity shining, the abrupt short beak entire or very nearly so ; 

 scale acute, about the length of the perigynium. Swamps, N. Y. to Mich., 

 and southward ; local. 



- -M. Spikes in a simple or nearly simple hdad. 

 = Leaves very narrow (\" broad or less), becoming more or less involute. 



104. C. teretiliscula, Gooden. Slender but mostly erect, 1|-2| high, 

 in loose stools ; culm rather obtuse, rough at the top, mostly longer than the 

 leaves ; head 1 -2' long, compact or somewhat interrupted, narrow (J' wide or 



