Obdkr 165.— CTPERACEjE. 739 



5 S. laciistria L. Lake Bullbusb. Cvhn, smooUi, leafless, filled with a porous 

 pith, 5 to if high, oylindiic, tapering above the panicle, and abruptly ending in a 

 short cusp ; panicle cymous near the top ; ped. rough, twice compound ; spikelets 

 ovoid, closely imbricate ; scales ovate, mucronate, pubescent ; bracts shorter than 

 the panicle. — The largest species of bulhush, frequenting the muddy margins of 

 rivers and ponds, XJ. S. to Arc. Am. July. (S. aoutus Muhl.) 



6 S. plingens Vahl. Culm nearly naked, 3-angled, comers acute and two of 

 the sides concave, about 3f high and ending in a sharp point; Ivs. few and short, 

 from the top of the sheath ; spikes lateral, 1 — 5, ovate, crowded and sessile, at 

 various distances below the point ; glumes round-ovate, mucronate ; bristles 6 ; 

 sl/yle 2-ckfi. — Ponds and marshes, fresh and salt, throughout N. America. (S. 

 triqueter Mx.) 



7 S. Olneyi Gray. Culm triquetrous-winged, leafkss, 2 — Tfhigh; sheath radical, 

 tipped with a short (1 — 2') leaf; spikes 6 — 12, sessile, aggregated, 2 — 3" long; 

 placed 9 — 12'' belovf the triangular apex of the stem ; glumes rOundish-ovate, 

 mucronato; bristles 6 — 12 ; ach. obovate, plano-convex, gibbous at apex. — Salt 

 marshes, Sekouk river, R. I. (Olney), Tom river, N. T., Kneiskern. Remarkably 

 distinguished by its 3-winged stem. July. 



8 S. Torreyi Olney. CMZ?n2f high, 3-angled, with concave, sides, rather slender, 

 leafy at ilie base ; Ivs. 2 or B, If or more long, slender ; spikes 2 — i (rarely 1), ses- 

 sile, distinct, acute, ovate-oblong ; scales ovate, mucronate, smooth ; sty. 3-cleft ; 

 ach. obovate, acuminate, unequally 3-sided, shorter than the bristles. — Borders of 

 ponds, W. Eng. to Mich. The stem here as in the last, is prolonged above the 

 spikes, ia the form of an involucral leaf. Jl., Aug. (S, mucronatus Ph. ? Torr.) 



9 S. maritimus L. Sea Bulleush. Culm acutely 3-angled, leafy, 2 — Sfhigh; 

 Ivs. broad-linear, rough-edged, carinate, taller than the stem; spikes conglome- 

 rate, 6 — 10, nearly an inch long, corymbous ; invol. of about 3 very long leaves ; 

 glumes ovate, 3-cleft, the middle segment subulate and reflexed ; style 3-cleft ; 

 bristles 3 — i, much shorter than the broad-obovate, lenticular, dark brown, polislied 

 CKhenium. — Salt marshes, N. Eng. to Flor. Aug. 



10 S. fiuviatilis Gray. ' Culm triangular-winged, leafy, stout, 3 or 4f high ; Ivs. 

 broadly linear, very long; invol. Ivs. 5 to 1, far exceeding the umbel; umbel 

 somewhat compound, spikes separate or conglomerate, large (9 to 12" long), ful- 

 vous ; glumes 3-eleft, bristles 6, whitish, longer than the sharply S-angled, oblong, 

 black achenium, which is tipped with a whitish beak. — Borders of lakes and rivers, 

 W. N. Y. and "W. States. Jl., Aug. (S. maritimus, /3. fluv. Torr.) 



11 S. atrovirens Muhl. Culm obtusely triangular, leafy, 2f high ; cyme com- 

 pound, proliferous ; invol. of 3 leaf-like bracts longer than the cyme ; spikes ovate, 

 acute, crowded, 10 to 20 in a globous head; hds. numerous, 4" diam., dark olive 

 green ; glumes ovate, mucronate ; bristles 4, straight, hispid downward, as long, as 

 the smooth, white achenium. — Common in meadows. Mid. and W. States. Jn., Jl. 

 Very different from S. sylvaticus L. of Europe. 



12 S. polyphyllus Vahl. Culm obtusely triangular, leafy, 2 — 3f high ; cyme 

 decompound, its principal branches about 5, unequal, with truncate sheaths at 

 base ; spikelets clustered in heads of 3 — 6 ; glumes obtuse, reddish-brown ; ach. 

 smooth, yellowish-white, twice shorter than the 4 or 5 smooth tortuous bristles. — 

 Much resembles the last species. Margins of waters, N. Eng., 111. and S. States. 

 (S. brunneus Muhl.) 



13. S. divaricatua Ell. Culm obtusely triangular, very leafy, 3 to 4f high; 

 Ivs. fiat, broadly linear or lance-linear, 3 to 6" wide, shorter than the culm; umbel 

 loose, large, decompound, rays filiform, divaricate, recurved ; spikes all separate, 

 pendulous, oblong-ovoid, 2 to 3" long, rust colored, pendulous ; gh-.mes many, 

 acute ; bristles tortuous, rather longer than the achenium which is tawny, elliptic- 

 3-a;ngled, acuto at each end. — "Wet barrens, S. Car. to La. (Hale). 



14 S. Eri6phorum Mx. Culm obtusely triangular, leafy, 3 to 5f high, Ivs. 2f 

 long, rough-edged; invol. i or 5-leaved, longer than the umbel; umbel terminal, 

 decompound, largo and loose ; spikes mostly pedicillale, 2 to 3'' long, ovoid, in 

 smaller clusters ; bristles 6, capillary, curled, very conspicuous, being 5 or 6 times 

 as long as tho white acheniimi. — A common, stiff, rank, meadow sedge, which 



