CYPERACE.E. (SEDGK FAMILY.) 543 



ohovate, as large as tlie ovate compressed 3-aiigled tuhercle ; bristles rigid, 

 Iiispitl. — Varies with larger spikes aud pubescent bristles. — Wet places, 

 cliietly along the coast, Florida, and northward. March - Sept. 2/ — Culms 

 6' - 1 2' high. Spikes 3" - 4" long (6" - 8" in the var.). Nut shining. 



7. E. tortilis, Schultes. Culms unequally 3-sided, acute-angled ; spikes 

 short, ovate, acute ; scales ovate-oblong, whitish, with brownish .sides ; nut 

 obovate, flat on the inner face, twice as long as the conical-beaked compres.sed 

 acute tubercle; bristles rigid. (Scirpus simplex, Ell.) — Miry places along 

 streams, Florida to North Carolina. May -Sept. % — Culms 1°-1^° high, 

 very slender, twisted when dry. Spikes 2" -3" long, angular, few-flowered. 



8. E. prolifera, Torr. Culms filiform, diffuse or floating, compressed ; 

 spikes ovate-lauceolate, acute, proliferous or rooting ; scales whitish, thin, 

 oval, obtuse ; nut obovate, compressed-Sangled ; tubercle half as long as the 

 nut, conical, 3-angled, free at the base ; bristles stout. — Marshy borders of 

 ponds and streams, Florida to North Carolina. May - Sept. 2^ — Culms 

 10' -20' long, tough and wiry. Spikes 2" -4" long, very rarely fruiting. 



^- f- Bristles 4-6, longer than the smooth nut. 



9. E. intermedia, Torr. Culms bristle-form, diffuse, furrowed; spikes 

 oblong-ovate, acute, 8- lO-flowered ; scales ovate-lanceolate, rather acute, thin, 

 brown on the siiles ; nut (3'ellowish) obovate, narrowed at the base, flat on the 

 inner face, backed Avith the subulate tubercle ; bristles 6, stout, as long as 

 the nut and tubercle. — Wet places and in shallow streams, Georgia, and 

 northward. — Culms 5° long. Spikes 2" - 3" long. Nut minutely striate. 



10. E. albida, Torr. Culms terete, spongy ; .spikes p.ale, oval or oblong, 

 obtuse, many-fl(iwered ; scales rigid, oval, obtuse, white or brownish ; nut 

 broadly obovate, whitish, flat on the inner face, smooth and shining ; tubercle 

 minute, free at the base ; bristles 6, reddish, longer than tlie nut. — Wet sandy 

 places along the coast. May -Sept. IJ. — Rhizoma filiform, creeping. Culms 

 2' -6' high. Spikes 2" -3" long. 



11. E. rostellata, Torr. Culms compressed, furrowed, wiry; spikes 

 ovate-lanceolate, acute, 1 2 - 20-flowered ; scales rigid, oval, obtuse, light brown ; 

 nut ol)ovate, flat on the inner face, tapering into the conical Ijeaked tuiiercle ; 

 bristles 4-6, stout, twice as long as the nut. — South Carolina, and north- 

 ward. — Culms 1°- ip high. Spikes 3"-4" long. 



■4- -1- -1- Bristles 2-6, not exceeding the nut, often vantiiig. 



12. E. melanocarpa, Torr. Culms compressed, furrowed, tough and 

 wiry ; spikes ovate or ovate-oblong, obtuse, many-flowered ; scales thin, ovate, 

 obtuse, white on the broad margins ; style 2 - 3-cleft ; nut black, obconical, 3- 

 angled or biconvex, truncate at the apex, and capped with the triangular 

 minutely pointed white tubercle ; bristles 3, as long as the nut, sometimes 

 wanting. — Pine barren swamps, Florida, and northward. June - Sept. 21 — 

 Culms 1° - H° high. Spikes 4" - .5" long, 2" thick, occasionally proliferous. 



13. E. arenicola, Torr. Rhizoma long and creeping; culms slender 

 slightly compressed, striate, tough and wiry ; spikes ovate, or at length oblong 

 or cylindrical, obtuse, many-flowered; scales thin, oblong, obtuse, brown at 

 the summit, Avhite on the margins; nut (yellowish) obovate, compressed-3- 



