544 CVlMCltACK.E. (SKDGK FAMILY.) 



niijiflcd, ciin.ractcil ijito :i ni'ck :it the liase uf tlie short cciiiic:il hcaked tubercle; 

 bristli'S 4-6, rudilish, nut loiij^er than the nut. — SjukIv sca-hlmru, West Flor- 

 ida to South Carolina. .May -Sept. "ij. — Uhhoiwii anil sheaths i)lack. 

 Culms G'-l')' hiu;li. Spikes 3"-0'' l<>njr. oi'ca.'^ionallv 2-3 cleft. .Nul nii- 

 uutely pitted. 



14. E. tricostata, Torr. Ulii/.oma stout, creeping; culms nearly terete, 

 Htriate, wiry; .•<])ikes cylindrical oblong, aculish, inauy-tlowered ; scales thin, 

 oblong, green on the keel, dark brown on the sides, white on the margins : 

 nut obovate, witli strong and rib-like angles, contracted into the minute conical 

 tubercle; Ijri.^tles none. — Low pine barrens, Florida, and northward. May- 

 Sept. ^ — Hhizoma and. slieatbs pale. Culms l°-l.i° iiigh. .Spikes 2"- -i" 

 long. Nut wry small, minutely wrinkled. 



15. E. tenuis, Schultes. Culms filiform, acutely 4 angled, the sheaths 

 purple; ."pikes elliptical, obtuse or acute, many-flowered ; scales oblong, ob- 

 tuse, green on the keel, d.ark brown on the sides, white on the margins; nut 

 obovate, 3-angled, transversely wrinkled and pitted, crowned with tiie broad 

 depressed short-pointed tubercle; bristles 2-3, much shorter than the nut, 

 fugacious. — Wet places, chiefly in the upper districts. — Culms 8'- 12' high, 

 almost bristle form. Spikes 3"- 4" long. Nut pale brown. 



16. E. microcarpa, Torr. Culms bristle- or hair-like, 4-angled; .«pikes 

 ovate or oblong, ol)tu.<e. 10- many-flowered, often proliferou.s ; scales oblong, 

 obtuse or acutish, membranaceous, brownish, with wliite margins; nut very 

 minute, white, obovate, rounded at the apex, and crowned with the depressed 

 minutely pointed tubercle; bristles 3-6, rarely as long as the nut, occasion 

 ally wanting. — Wet sandy places, Florida to North Carolina, and westward. 



17. E. Torreyana, Boeckl. Spikes many-flowered, dark brown; nut 

 obovate, oblong, narrowed at the ape.v, and crowned with the conical 3-angled 

 tubercle ; bri.-<tles rigiil, rather longer than the nut. — Low sandy places, Flor- 

 ida, and northward, chiefly near the coast. May- Sept. — Culms tufted, 3'- 

 9' high. Spikes r'-2" long. Lowest scale larger and persistent. Nut 

 strongly 3-angled. 



* » » Sj'ikes thicker than the culm : style 2-3-cleJ} : nut lenticular. 

 •*- Culms A-angled, bristle-like. 



18. E. bicolor, Ch.apm. Culms erect or procumbent, 4-angled or 4fur- 

 rowed ; spikes ovate, obtuse, 8- 12-flowered ; scales thin, loosely imbricated, 

 ovate, obtuse, white on the keel and margins, the sides dark brown; style 2- 

 3-cleft ; nut very minute, white, obovate, lenticular, smooth, twice as long a."", 

 the three fugacious bristles ; tubercle broadly conical, compressed, one third 

 as long as the nut. — Sandy margins of ponds, near Quincy, Florida. August. 

 (l) — Culms tufted, 1'- 6' long, when growing in water finely knotted. Spikes 

 \i" long. 



19. E. atropurpurea, Kunth? Culms tufted, erect, 4-furrowed, the 

 sheaths dark brown ; spikes ovate or oblong, obtuse, at length very many- 

 (70-100-) flowered; scales oval, very obtuse, thin, brown on the sides, white 

 on the margins ; stainens 2 ; style 2-cleft ; nut very minute, pear-shaped, com- 

 pressed, almost truncate at the apex, tipped with the somewhat peltate tuber- 



