520 CYPr.uACK.E. (sedge family.) 



smootli, orliicular, 2-('hft, imicnmato ; iintlicrs oliiii^c ; stylo 2-clfft ; nut round- 

 oliovato, ])l;mi)-('oiivc-x, us lonjj us tlie G hispid bristles. — ]5r!U'ki<li innr.shc:, West 

 Florida, and noitliwiud. June - Sept. — Culms 2° - 4° liigli. Leaves 2' - 4' long. 

 Spikes 2" long. 



H- -1- SpiLrs uniMled. 



5. S. laOUStris, L. Ouliu tall (3° -8° Iiigli), tc'ictp, lea (less, or tlie radical 

 sheaths Icafv-pointed ; involucre 1 -leaved, pungent, shorter than the decompound 

 lunhel ; spikes ovate orohlong, mostly clustered ; scales ovate, emurginate, rough- 

 awncd, ciliatc on the margins, pubescent on the back and green keel ; style 2-cleft ; 

 nut obovate, pointed, plano-convex, shorter than the .3 - G strongly hispid bristles. 

 (S. validus, Vahl.) — Varies, with the broader keeled and fimbriate bristles rather 

 shorter tlian the round-obovatc nut. — Fresh or brackish marshes and ponds, 

 Florida, and northward. July -Sept. 



6. S. leptolepis. CulmsS-angled, leafy at the base (20-3° high) ; leaves 

 long, sliarply keel'd, triangular-compressed near the obtuse curved apex, the 

 immer.scd ones flat and pellucid; involucre slender ("' long), leaf-like, with 

 shorter ones at the divisions of the compound nmhel ; spikes single, oblong or 

 cylindrical, many-flowered, acute ; scales light brown, lanceolate-oblong, acute, 

 smooth, membranaceous, mucronate, and, like the three obtuse anthers, finely 

 spotted ; style 3-partcd ; nut whitish, 3-anglcd, oblong-obovate, long-pointed, 

 shorter than the 5 slender and minutely denticulate bristles. (S. maritimus, var. 

 cylindricus, Torr.?) — Lakes and ponds, Middle Florida, and westward. Dr. 

 Hale. September. 



§ 2. Culms Jointed, leafij throur/hout : umbel terminal: involucre 2 -several-leaved, 



spreading. 



* Bristles hispid downward. 



7. S. maritimus, L. Culm sharply 3-angled, rough above ; leaves longer 

 than the culm, keeled; umbel simple, 1-3-rayed, bearing single or 2-3 spikes 

 in a duster, or the spikes all clustered and sessile ; involucre 2 - 4-leaved, much 

 longer than the umbel ; spikes large, ovate or oblong-ovate, dull brown ; scales 

 thin, ovate, pubescent, tipped with a spreading awn ; nut round-obovate, plano- 

 convex or lenticular, smooth and shining, twice the length of the 4 weak bristles. 

 — Saline marshes, Florida, and northward. Aug. and Sept. — Culms 2° - 3° 

 high. Spikes 6"- 10" long, 4" in diameter. 



6. S. polyphyllus, Vahl. Culm obtuse-angled, smooth ; leaves long, 

 rough on the margins ; umbel decompound, spreading ; spikes small, 3 - 8 in a 

 cluster, ovate, yellowish-brown ; scales ovate, mucronate, keeled ; bristles 6, 

 slender, hispid near the summit, mostly tortuous, 2-3 times as long as the pale 

 compressed-3-angled pointed nut. (S. exaltntus, Pursli.) — Shady swamps, 

 North Carolina, and northward. July. — Culm 2° - .5° high. Spikes l"long. 

 ■ 9. S. divaricatUS, Ell. Culm round-angled, many-jointed; leaves flat, 

 broadly linear; umbel large, widely spreading or drooping, decompound, longer 

 than the 3-leaved involucre ; spikes all single, oblong-linear, scattered ; scales 

 ovate, obtuse, 3-nerved, brown on the sides ; bristles hair-like, rather roughened 

 than hispid, crisped .it the summit, longer than the obovate pointed cqual-sided 



