512 CYPEHACKJC. (SEDGE FAMILY.) 



1C. C>. VlllpillOidea, Michx. Spike oblong and dense, o; more or lees 

 interrupted, of 8-10 crowded clusters (l'-2' long); perigynia ovate from a 

 broad base, with a more or less abrupt beak, diverging at maturit}'. (C. multi- 

 flora, Muhl. C. bracteosa and C. polymorj)ha, Schw. C. mierospcrma, H /</ ) 



Varies with the perigynium narrower, and the beak tapering and more strongly 

 serrulate. (C. setacea, Dew.) Low meadows; very common. Varies ex- 

 ceedingly in the size and shape of the perigynium and beak. 



# * * Perigynia on short stalks, plano-convex, without a margin, membranaceous, 

 with a tliick and sponyy base and a long tapering 2-toothed rough beak, distiuct- 

 ly nerved (only obscurely so in No. 20 and 21 ), widely spreading and yel'ow at 

 maturity: spikes dense, more or less aggregated, sometimes decompound: 

 scales of the fertile spikes tawny, with a sharp point : bracts bristle-shaped, 

 shorter than the thick and triangular culms. VULPINE. 



17. C. Cl'lIS-Corvi, Shuttleworth. Spike very large, decompound, the 

 lower branches long and distinct, the upper shorter and aggregated ; bracts ojien 

 2-toothed at the base : fieri(/i/nia attenuated from an ovate dilated and truncate base into 

 a very long slightly-winged b<ak, much exceeding the scale ; style tumid at the base. 

 (C. sicajformis, Boott. C. llalei, />//.) Swamps, Ohio to Wisconsin, and 

 southward. A conspicuous, very large species, with spikes 4' -9' long, often 

 somewhat paniculate, and ylaucous leaves i' wide. 



18. C. Stipata, Muhl. Spikes 10-15, aggregated, or the lower ones dis- 

 tinct and sometimes compound ; ]>eri<jy>a'a lanceolate, with a lony beak tapering 

 from a truncate base, much exceeding the scale; style not tumid at the base. (C. vul- 

 pinoidea, Ton'., Cyp., not of Michx.) Swamps and low grounds; common. 



19. C. Ylllpma, L. Spikes numerous, aggregated into a cylindrical and 

 dense (or at times elongated and somewhat interrupted) compound spike; peri- 

 gynia compressed, tajieriita from a broadly-ovate base, into a beak; not much lonyer than 

 the scale; aclienium oi-al ; style tumid at the base.. Ohio, Illinois, and Kentucky. 



A tall, robust species, 3 -4 high, with wide leaves and a remarkably tliick 

 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 perigynia. The forms 

 with interrupted spikes have also a general resemblance to ]So. 22; which, how- 

 ever, is distinguished by the maraiiud and mrnhss pcrigynia. (Ku.) 



20. C. alopCCOiflca, Tuekcrman. Head of 8-10 aggregated spikes, 

 oUong, dense ; jtfriyynia compressed, ct-ry obscunfy nerced, orate from a l>road trun- 

 cate or somewhat heart-shaped base, a little longer than the scale ; achuuuv, }>yri- 

 fonn; base of the style not tumid. (C. cephalophora, var. maxima, D<ic.) 

 Woods, \V. New York to I'eim., Michigan, &c. Much resembling the last, 

 but smaller, with shorter and more compact spikes ; easily distinguished by the 

 nearly ;K-/VV/ISS perigynia, and the diil'erent aehenium and style. 



21. C. imilM tl;i, L. Spikes 4- G, ovoid, approximate but distinct, the 

 lowermost sometimes a little remote; pcriyynia nnih--hinc<ohiti-, somewhat com- 

 pressed, inrnl(ss, or rtrij obsi-nrdy ncrnd totrards the base, rather longer than the 

 scale; aehenium ovat< , ba>e of the style not tumid. Fields, Massachusetts (in- 

 troduced ?), Ohio, and Kentucky ; rare. Spikes mostly looser than in the last, 

 Hie perigynia narrower, with a longer and more tapering beak. (Eu.) 



