i>C>2 cYi'KKACK.K, (si:d(;k kamilv.) 



long as tlie ovatp Imig-poiiitod srale. — Dry soil, Fli>ri<la, and nortlnvard. — 

 Culms 9'- IT)' liigli, naked ahovc, rougli mi the angles, tmigli and wiry. 

 Leaves narniw. Head J' long, liiaets liristle-like. 



9. C. rosea, Sehk., var. radiata, Dew. spikes 2 -4, 3 -Gliuwered, dis- 

 tant; perigynia <)hk)ng, jjlano-convex, rougli-heaked, spreading at maturity, 

 twice as long as the broadly ovate ohtuse or short-mueronate scale. — I'pper 

 districts, Georgia, and northward.— Culms 1° high, smooth, longer than the 

 narrow leaves. Common spike 2' -3 lonir- Bract of the lowest .'<pike com- 

 monly exceeding the culm. 



10. C. Texensis, Bailey. Spikes 4-5, scattered, few-flowered, all but 

 the u])perni()st lealy-liracteil ; perigynia spreading, lanceolate, sjjongy at tiie 

 base, smooth, more tlian twice longer tlian tlie ovate acute scale; culms very 

 slender, i°-l° high, exceeding the tender leaves. — Mississij)pi ( 7Vacey), and 

 westward. 



11. C. retroflexa, Mnhl. Spikes 4-5, crowded, or the lower ones dis- 

 tinct, ovoid, the lowest short-bracted ; perigynia ovate-lanceolate, smooth- 

 beaked, 2-cleft, at length widely spreading or reflexed, spongy at the ba.<«e, 

 barely longer than the ovate long-pointed scale. — Open woods, Florida, and 

 northward. — Culms slender, 1° higli, rough-angled above. Leaves narrow, 

 shorter than the culm. Common spike about 1' long. 



* * * SpiJcps lolth the lower flowers sterile, the upper fertile. 



12. C. Stellulata, Good. Spikes 3-5, obovoid, di.stinct, the upjiermost 

 club-shaped at the base ; perigynia ovate, rounded at the base, ta])ering into a 

 short and rough 2cleft beak, finely nerved, spreailing and finally recurved, 

 rather longer than the ovate pointed scale. (C. scirpoides, Schh.). — Shady 

 river swamps, Florida, and northward. — Culms 6'- 12' high, weak. Leaves 

 narrow and tender. Spikes small. 



Var. sterilis. Sterile and fertile spikes on separate culms,' or some of 

 them either sterile or fertile on the same culm, otherwise like the preceding, 

 and growing; in similar places. (C sterilis, Wllld.) 



\&v. conferta. Culms taller (2° high) and stouter; s])ikes larger and 

 more crowded; perigynia round-ovate, twice as long as the broadly ovate 

 barely pointed scale. — Pine barren swamps. 



13. C. eanescens, L., var. alpicola, "Wahl. Spikes 5 - 7, small, scat- 

 tered, roundish, C- 10-flowered ; perigynia ovate, jdano-convex, short and 

 rough-beaked, spreading and tawny at maturity, rather longer than the ovate 

 acute white scale. — High mountains of North Carolina, and northward. — 

 Culms weak and slender, 10' -15' high, longer than the narrow tender leaves. 



14. C. SCOparia, Sclik. Spikes 6-8, apprf)ximate, ovate or oldong, 

 many-flowered ; ])erigynia oblong-lanceolate, narrowly mai'gined, acute at the 

 base, tapering into a long 2-cleft rough beak, longer than the ovate-lanceolate 

 pointed scale, turning light brown at maturity. — Swamps, South Carolina, 

 and northward. — Culms l°-2° high, rough above, longer than the narrow 

 leaves. 



15. C. tribuloides, Wahl. Spikes 10 or more, crowded in an oblong 

 head, oval or ohovate, light green ; perigynia lanceolate, tapering into a mar- 

 gined serrulate beak, nearly twice the length of the obtuse scale. (C. lagopo- 



