CVPERACE^E. (si;r>GE FAMILY.) 519 



or samlv li:ink> near tlio coast, Florida, ami nortliwanl. April -July. — Rhizoina 

 very sluiukr, boaiiiig miiiuti.' tul».'r-likc buds. Spikes l"-2" long. 



25. E. Baldwinii, Torr. Culms (4' -C long) grooved, difTusc, wiry ; 

 spikes oblong, flat, 3 - 5-flo\vcrcd, proliferous and rooting; scales 4 -6, 2-rankcd, 

 lanceolate, obtuse, finely nerved, the lower ones longer ; nut smooth, oblong, 

 strongly 3-angled, crowned with the conical 3-anglcd sessile tubercle; bristles 

 4-6, unequal, the longest as long as tlie nut. — Swamps, Florida and Gco»fria. 

 June -Sept. IJ. — Sheaths light brown. Spikes 2" long. 



8. SCIRPUS, L. Bulrush. 



S|)ikes terete, single, or oftencr in clusters or umbels, whii'li arc subtended by 

 ft 1 -manj'-Ieavcd involucre. Scales imbricated in several rows. Kut obtuse, 

 or pointed by the persistent jointless base of the style. Tubercle none. — Culms 

 jointed and leafy, or leafy or siieathed only at the base. Otherwise like Eleo- 

 charis. — All perennial except No. 2. 



§ 1. Culms joinile.ss : leaves or sheaths radical. 

 * Si)ilce solitary, terminal. 



1. S. caespitOSUS, L. Culms tufted (6'-10' high), terete, wiry; sheaths 

 numerous, rigid, imbricated, the uppermost ending in a short leaf; spike 3-8- 

 flowered ; involucre 2-leaved, as long as the spike, pointed ; nut oblong, com- 

 presscd-3-angled, abruptly pointed, half as long as the smooth capillary bristles. 

 — High mountains of Xorth Carolina, and northward. July. — Ilhizonia thiik 

 and creeping. Spike l"-2'' long. 



* * Spikes 2 - many , apparcn'J u lateral : the \-lf-aved involucre erect and continuous 



with the culm. 

 •*- Spikes in sessile clusters. 



2. S. debilis, Pursh. Culms terete, slender, commonly leafless ; spikes 

 2-5, oblong-ovate or cylindrical; involucre elongated; scales round-ovate, 

 obtuse mucronate; style 2-3-clcft; nut broadly obovate, plano-convex, smooth, 

 shorter than the 4-6 strongly hispid bristles. — Borders of ponds and streams, 

 South Carolina, and northward ® — Culms i°-U° high. Spikes 3" -5" 

 long. 



3. S. pungens, Vahl. Culms stout, acutely 3anglcd, two of the sides 

 concave, leafy at the base ; leaves ciiannellcd, sharply keeled; involucre slender 

 (3' -4' long); spikes 3-6, light brown, oblong; scales membranaceous, oval, 

 2-cleft, mucronate-awned, slightly ciliate ; anthers slender-pointed; style 2-eleft; 

 nut round-obovate, plano-convex or lenticular, as long as the 3-5 hispid bristles. 

 (S. Americanus, Pers.) — Sandy marshes along the coast. West Florida, and 

 northward. June- Sept. — Culm 2°-3° high. Leaves 2-3, mostly shorter 

 tliau the culm. Spikes 4"-G'' long. 



* 



4. S. Olneyi, Gray. Culms stout, willi three-winged angles, and three deeply 



channelled sides, leafless, or the sheaths ending in short pointed leaves ; invo- 

 lucre short (I' -1' long) rigid; spikes 7-13, short, ovate, dark brown; scales 



