544 CYPERACE.E. (SEDGE FAMILY.) 



angled, contracted into a neck at the base of the short conical-beaked tubercle ; 

 bristles 4-6, reddish, not longer than the nut. Sandy sea-shore, West Flor- 

 ida to South Carolina. May -Sept. 1J. Rhizoma and sheaths black. 

 Culms 6' -15' high. Spikes 3" -6" long, occasionally 2-3-cleft. Nut mi- 

 nutely pitted. 



U. E. tricostata, Torr. Rhizoma stout, creeping ; culms nearly terete, 

 striate, wiry; spikes cylindrical -oblong, acutish, many-flowered; scales thin, 

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

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

 tubercle ; bristles none. Low pine barrens, Florida, and northward. May- 

 Sept. 11 Rhizoma and sheaths pale. Culms 1-!^ high. Spikes 2"-4" 

 long. Nut very small, minutely wrinkled. 



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

 purple; spikes elliptical, obtuse or acute, many-flowered ; scales oblong, ob- 

 tuse, green on the keel, dark brown on the sides, white on the margins ; nut 

 1 1 ln\ ate, 3-angled, transversely wrinkled and pitted, crowned with the 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; spikes 

 ovate or oblong, obtuse, 10 -many-flowered, often proliferous; scales oblong, 

 obtuse or acutish, membranaceous, brownish, with white 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. 



1". E. Torreyana, Bceckl. Spikes many-flowered, dark brown; nut 

 obovate, oblong, narrowed at the apex, and crowned with the conical 3-angled 

 tubercle ; bristles rigid, rather longer than the nut. Low sandy places, Flor- 

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

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

 strongly 3-angled. 



* * * Spikes thicker than the culm: style 2-3-cfeft: nut lenticular. 

 t- Culms Wangled, bristle-like. 



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

 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 as 

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

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

 (T) Culms tufted, 1' - 6' long, when growing in water finely knotted. Spikes 

 U" 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; stamens 2; style 2-cleft ; nut very minute, pear-shaped, com- 

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



