518 CYPERACEJX. (SEDGE FAMILY.) 
none. — Margins of ponds and streams, West Florida. June-Aug. @— 
Culms 3'-5'high. Spikes 1-2” long, the lower scales deciduous as new 
flowers are developed. Nut black, smooth and shining. 
+ + Culms terete or compressed, more or less spongy. 
19. E. capitata, R. Brown. Rhizoma slender, creeping; culms com- 
pressed; spikes short, ovate, 12 — 16-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. — Springy 
or miry places, Florida, Georgia, and westward. June- Sept. ) — Culms 
P-4'high. Spikes 17-2" long. Scales often brown when young. Nut very 
small. 
20. E. olivacea, Torr. 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-flowered, 
21. H. 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, the 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. 
X — Rhizoma black. Culms 1°-3° long. Spikes 3" —5" long. 
22. E. obtusa, Schultes. Culms tufted, terete, thick and spongy; spikes 
ovate 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, EIL) — Muddy margins of ponds and seem, 
Florida, and northward. Common. June- Sept. — Culms 6' - 18' high. Spikes 
2!! - 4" long, 
§ 2. CILETOCYPERUS. Spikes few-flowered, compressed: scales membranaceous, 
Beet imbricated in 2-8 rows: style 3-cleft. Culms capillary. 
. 23. E. acicularis, R. Br. Culms (2/-19/ high) angled; spikes ovate, 
5-6fowered, acute; scales oblong, with reddish sides; mut oblong, ier 
nearly terete, longitudinally ribbed and pitted, pointed with the conical or de 
tubercle ; bristles 3— 4, shorter than the nut, sometimes wanting. € 
ides, Muli.) — Margins of ponds, Florida, and northward. June 
ea. Torr. Culms short (1/-2! high), grooved on 
red ; scales whitish, ovate; nut ovate, pale, pron 
