518 CYPERACE.E. (sedge FAMILY.) 



none. — Margins of ponds and streams, West Florida. June -Aug. ® — 

 Culms 3' -5' high. Spikes l"-2''' long, the lower scales deciduous as nevr 

 flowers are developed. Nut black, smooth and shining. 



■I- •<- Culms terete or compressed, more or less spongy. 



19. E. capitata, R. Brown. Ehizoma slender, creeping; culms com- 

 pressed; spikes short, ovate, 1 2 - 1 6-flowered ; scales membranaceous, whitish, 

 oblong, obtuse, deciduous ; nut black and shining, broadly obovate, biconvex, 

 tipped with the short conical tubercle ; bristles 6, as long as the nut. — Springv 

 or miry places, Florida, Georgia, and westward. June - Sept. H. — Culms 

 l'-4'high. Spikes 1"- 2" long. Scales often brown when young. Nut verv 

 small. 



20. E. olivacea, Ton-. Culms compressed, furrowed, diffuse ; spikes 

 ovate, acutish, many-flowered ; scales ovate, obtuse, thin, purplish on the sides, 

 green on the keel, the margins white ; nut obovate, dull, dark olive ; tubercle 

 distinct, conical-beaked ; bristles 6-8, about half as long as the nut. — Wet 

 sandy places. North Carolina, and northward. Aug. and Sept. — Culms 2'- 5' 

 long. Spikes 3" long, 20-30-flowercd. 



21. E. palustris, R.Brown. Rhizoma creeping; culms slender, terete, 

 striate ; spikes oblong-lanceolate, mostly acute, many -flowered ; scales oblong, 

 membranaceous, brown on the sides, at length whitish, tlie upper ones acute ; 

 nut dull yellow, obovate, tumid, minutely dotted; tubercle short, triangular- 

 ovate, compressed ; bristles 4, slender, commonly as long as the nut. (Scirpus 

 palustris, L.) — Marshes and wet places, Florida, and northward. June -Sept. 

 U — Rhizoma black. Culms l°-3° long. Spikes 3" -5" long. 



22. E. obtusa, Scluiltes. Culms tufted, terete, thick and spongy ; spikes 

 ovifte or oblong, obtuse, many-flowered ; scales thin, oblong, obtuse, commonly 

 brown on the sides, green on the keel, with broad and white margins ; style 

 2-3-cleft; nut (light brown) obovate, lenticular, smooth and shining, scarcely 

 wider than the short compressed acute tubercle ; bristles 6, rigid, twice the length 

 of the nut. (Scirpus capitatus. Ell.) — Muddy margins of ponds and streams, 

 Florida, and northward. Common. June -Sept. — Culms 6' -18' high. Spikes 

 2" -4" long. 



^ 2. CH-^TOCYPERUS. Spikes few-flowered, compressed : scales membranaceous, 

 imbricated in 2-3 rows: style 3-cleJl. Culms capillary. 



23. E. acicularis, R. Br. Culms (2' -12' high) angled: spikes ovate, 

 5- 6-flowered, acute; scales oblong, with reddish sides; imt oblong, white, 

 nearly terete, longitudinally ribbed and pitted, pointed with the conical or de- 

 pressed tubercle ; bristles 3-4, shorter than the nut, sometimes wanting. (Scir- 

 pus trichodes, Mulil.) — Margins of ponds, Florida, and northward. June- 

 Sept. 



24. E. pygmsea, Torr. Culms short (V -2' high), grooved on one side; 

 spikes ovate, 3 - 6-flowcred ; scales whitish, ovate ; nut ovate, pale, prominently 

 3-angled, smooth and shining, narrowed above into the minute tubercle ; bristles 

 6, longer than the nut, sometimes wanting. (Scirpus capillaceus, Ell.) — Muddy 



