516 CYPERACE^. (sedge FAMILY.) 



7. E. simplex, Torr. 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 compressed 

 acute tubercle; bristles rigid. (E. tortilis, Schult. Scirpus simplex, £■//.) — 

 Miry places along streams, Florida to North Carolina. May - Sept. 1|. — 

 Culms l°-lj° high, very slender, twisted when dry. Spikes 2" -3" long, 

 angular, few-flowered. 



8. E. prolifera, Torr. (Cyp. p. 315, not of p. 442). Culms filiform, dif- 

 fuse or prostrate, compressed ; spikes ovate-lanceolate, acute, proliferous or 

 rooting ; scales whitish, thin, oval, obtuse ; nut obovate, compressed-3-angled ; 

 tubercle half as long as the nut, conical, 3-angled, free at the base ; bristles 

 stout. (E. vivipara, Link.) — Marshy banks of ponds and streams, Florida to 

 North Carolina. May -Sept. y. — Culms 10' -20' long, tough and wiry. 

 Spikes 2" -4" long, very rarely fruiting. 



■*- H- Bristles 4-6, longer than the smooth nut. 



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

 oblong-ovate, acute, 8 - 10-flowered ; scales ovate-lanceolate, rather acute, thin, 

 brown on the sides ; nut (yellowish) obovate, narrowed at the base, flat on the 

 inner face, beaked with the subulate tubercle ; bristles 6, stout, as long as the 

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



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



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

 obtuse, many-flowered ; 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 the nut. — Wet sandy places 

 along the coast, Florida to South Carolina, and westward. May -Sept. y. — 

 Rhi/.oma filiform, creeping. Culms 2'- 6' high. Spikes 2" -3" long. 



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

 ovate-lanceolate, acute, 12 -20-flowered ; scales rigid, oval, obtuse, light brown ; 

 nut obovate, flat on the inner face, tapering into the conical-beaked tubercle ; 

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



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



H- 4- -1- Bristles 2-6, not exceeding the nut, often wanting. 



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 want- 

 ing. — Pine-barren swamps, Florida, and northward. June - Sept. Ij. — Culms 

 1"-!^° high. Spikes 4" -5" long, 2" thick, occasionally proliferous. 



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

 slightly com))resse(l, striate, tough and wiry ; spikes ovate, or at length oblong 

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

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



