534 CYPERACEJE. (SEDGE FAMILY.) 



■i- t- Spikes 4-10, disposed in a simplt spikt or i«<i<l, or (in No. 6) the lowest ones 



compound. 



6. C. sparganioides, Mulil. Spikes 6- 1<>, ovoid, the upper ones crowd- 

 ed, the lower scattered and often compound ; perigynia flattened, ovate, acute at 

 the base, narrowly margined, nerveless, spreading, with a short and rough 2-cleft 

 beak, twice as long as the thin ovate scale. — Upper districts of Georgia, and 

 northward. — Culms stout, 2° high. Leaves broadly linear, as long as the culm. 

 Common spike 2' -4' long. Perigynia yellowish 



7. C. Muhlenbergii, Schkr. Spikes 5-8, ovoid, approximate, or crowd- 

 ed in an oblong head; perigynia round-ovate, plano-convex, strongly nerved, 

 with a short and broad rough-edged 2-cleft beak, barely longer than the ovate 

 short-pointed scale. — Dry sterile soil, South Carolina, and northward. — Culms 

 12'- 18' high, rigid, rough above, twice as long as the narrow leaves. Head or 

 spike 1' long. Bracts bristle-form, longer than the spikes. 



8. C. cephalophora, Muhl. Spikes 5-6, small, crowded in a compact 

 ovoid head ; perigynia broadly ovate, few-nerved, short and rough-beaked, as long 

 as the ovate long-pointed scale. — Dry soil, Florida, and northward. — Culms 

 9'- 15' high, naked above, rough on the angles, tough and wiry. Leaves nar- 

 row. Head £' long. Bracts bristle-like. . 



9 C. rosea, Schk. Spikes 4 -6, 8- 10-flowcrcd, the two upper ones ap- 

 proximate, the others scattered , perigynia oblong, plano-convex, rough-beaked, 

 spreading at maturity, twice as long as the broadlyovateobtu.se or short-mucronate 

 scale. (C. radiata, Dew, a form with more slender culms, and 3-4-flowered 

 spikes.) — Upper districts, Georgia, and northward. — Culms 1° high, smooth, 

 longer than the narrow leaves. Common spike 2' -3' long. Bract of the lowest 

 spike commonly exceeding the culm. 



10. C. retroflexa, Muhl. Spikes 4-5, crowded, or the lower ones dis- 

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

 2 cleft, at length widely spreading or reflcxed, barely longer than the ovate long- 

 pointed scale. — Open woods, Florida, and northward. — Culms slender, 1° high, 

 rough-angled above. Leaves narrow, shorter than the culm. Common spike 

 about 1' long. 



* * * S]>ikes with the lower flowers sterile, the upper fertile. 



11. C. stellulata, Good. Spikes 3-5, obovoid, distinct, the uppermost 

 club-shaped at the base, perigynia ovate, rounded at the base, tapering into a 

 short and rough 2-cleft beak, finely nerved, spreading and finally recurved, 

 ratlur longer than the ovate pointed scale. (C. scirpoides, Schk.) — Shady 

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

 narrow and tinder. Spike> small. 



Var SteriliS. Sterile and fertile spikes on separate culms, or some of tin in 

 either sterile or fertile on the same culm, otherwise like the preceding, and grow- 

 ing in similar places. (C. Bterilis, Willd.) 



Var. conferta. Calms taller (2° high) and stouter ; spikes larger ami more 

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

 pointed Bcale. — Pine-barren swamps. 



