541 
CTPERACEJE. (SEDGE FAMILY.) 
tile spikes tawny, with a sharp point: bracts bristle-shaped, shorter 
than the thick and triangular culms. — Vulp'in/e. 
17. C. crus-corvi, Shuttleworth. Spike very large, decom¬ 
pound, the lower branches long and distinct, the upper shorter and 
aggregated ; bracts ^-toothed at the base ; perigynia attenuated from an 
ovate dilated and truncate base into a very long slightly-winged beaky 
much exceeding the scale; style tumid at the base. (C. sicreformis, 
Boott. C. Halei, Dew.) — Swamps, Ohio and southwestvvard. —A 
conspicuous, very large species, with spikes 4* — 9^ long, often some¬ 
what paniculate, and glaucous leaves wide. 
18 C. Stipitta, Muhl. Spikes 10-15 aggregated, or the low¬ 
er ones distinct and sometimes compound; perigynia lanceolate, with 
a long beak tapering from a truncate base, much exceeding the scale ; 
style not tumid at the base. (C. vulpinoidea, Torr. Cyp., not of Michx.) 
— Swamps and low grounds, common. 
19. C. Vlllpina, L. Spikes numerous, aggregated into a cy¬ 
lindrical and dense, or at times elongated and somewhat interrupted, 
compound spike; perigynia compressed, tapering from a broadly-ovate 
base into a beak not much longer than the scale; achenium oval; style 
tumid at the base. — Ohio, Sullivant (Illinois, Engelmann). A tall, 
robust species, 3°-4° high, with wide leaves and a remarkably thick 
rough culm. It is very like the last, from which it chiefly differs in 
the more compressed and wider base and shorter beaks of the peri¬ 
gynia. — The forms with interrupted spikes have also a general 
resemblance to No. 22; but that species is readily distinguished by 
the margined and nerveless perigynia. 
20. C. alopecoldea, Tuckerman. Head of 8 - 10 aggregated 
spikes, oblong, dense; perigynia compressed, very obscurely nerved, 
ovate from a broad truncate or somewhat heart-shaped base, a little 
longer than the scale; achenium pyriform ; base of the style not tumid. 
(C. cephalophora, var. maxima, Dew.) — Woods, W. New York, 
Sartwell. — Much resembling the last, but a smaller plant with short¬ 
er, more compact spikes, and easily distinguished by the nearly nerve¬ 
less perisynia, and different achenium and style. 
21. C. marietta, L. Spikes 4-6, ovoid, approximate but 
distinct, the lowermost sometimes a little remote, pertgV” , 
lanceolate, somewhat compressed, nerveless, or />l>*cur' V nerv'd 
to,oar,Is the base, rather longer than the scale ; , achenium mate, i base o 
the style not tumid. - Fields, Massachusetts (mtroduced?) and north¬ 
ward, not common.-Spikes much looser than in the last, the pen- 
gynia narrower, with a longer and more tapering ea *. 
* * * * Perigynia sessile , plano-convex, compressed, 
margined, membranaceous, with a rather short rou £ ( sm 
No. 26) 2-toothed beak, spreading and green at matun y . sea 
46 
