CYPKRACE^. ' 395 



Along streams and in ponds. N. Y. to Car. July, Aug. %.— Culms 9—18 

 inches high, growing in tufts. Spikeleis 1 — 6, bursting in a cluster from the 

 side of tlie culm two or three inches from the top. Scales pale geeen. Bristles 

 4—6, retrorsely hispid. Weak-stalked Club Rush. 



5. iS*. triqiieter Linn. : culm nearly naked, triangular or slightly winged, 

 two of the sides concave ; spikes 1 — G, ovoid, aggregated and sessile ; 

 scales round-ovate, mucronate ; achenium doubly convex, acuminate. 

 S. Americanus Pursh. S. mucronalus, Pursh. 



Ponds and marshes. Throughout N. Amer. to the Arctic regions. J«ly, Aug. 

 '^1- — Culm 3—5 feet high, slender, mucronate, very acutely triangular, some- 

 times winged. Spikes in a dense cluster usually near the top. Scales rusty 

 colored. Bristles 3 — 5, slender, retrorsely hispid. Used for the bottoms of 

 chairs. Chairmaker's Rush. 



G. S. viucronatus Linn. : culm leafy at base, triangular, the sides con- 

 cave; spikes 2 — 4, oblong-lanceolate, sessile; scales ovate, mucronate, 

 smooth ; anthers acute, (not fringed) ; achenium angular-convex exter- 

 nally, mucronate. 



Margins of ponds. Boston, Mass. West Point, N. Y. W. to Mich. ; rare. 

 Torr. July. %. — Culm about 2 feet high, with one or. two leaves at base which 

 are sometimes more than a foot long. Spikes clustered, more elongated and of a 

 lighter color than in the preceding. Bristles 6, rather slender, longer than the 

 achenium. Mucronate Club Rush. 



7. »§. lacustris Linn.: culm terete, attenuate above, leafless; panicle 

 growing from the side of the culm near the top ; spikes ovoid, mostly pe- 

 dunculate ; scales ovate, mucronulate, cihate ; achenium obovate, convex 

 on the back, S. aculus MiM. S. validus Pursh. 



Ponds and swamps. Subarct. Amer. to Flor. W. to the Pacific Ocean. 

 June, July. %. — Cuhn 3 — 8 feet high, round and tapering upwards, terminating 

 in a cusp, which projects 1 — 2 inches above the panicle. Spikes in an unequal 

 subdivided cymose panicle or umbel. Scales brown, minutely pubescent. 

 Bristles 4—6, stout, hispid. Tall Club Rush. Bulrush. 



ff Spikes terminal., 



8. (S. maritimus Linn. : culm triangular, leafy ; corymb clustered, shorter 

 than the 3-leaved involucre ; spikes ovoid-oblong, rather obtuse ; scales 

 ovate, 3-cleft or 3-toothed, the middle segment subulate and reflexed ; 

 style 3-cleft ; achenium broad-obovate, lenticular. S. robnskis Pursh. S. 

 macrostachyos Muhl. (in part.) 



Salt marshes and ditches. Subarct. Amer. to Flor. July, Aug. %-. — Culm 

 1 — 4 feet high, thick, smooth, leafy below. Spikes usually forming somewhat 

 compound corymbs. Scales chestnut-colored, membranaceous. Bristles 3 — 4, 

 very slender, hispid. A variety of this species occurs in fresh-water marshes, 

 and is common in Western N. Y. It has the corymb somewhat compound, the 

 spikes ovoid and acute, and the involucre 3 — 5-lobed. Torr. 



Marsh Club RusJ^ 



9. S'. atrovirens Muhl. : culjn triangular, leafy ; cyme compound, pro- 

 liferous ; involucre 3-leaved ; spikes ovoid, acute, densely glomerated in 

 heads of 10 — '20 ; scales ovate, mucronate, pubescent ; style 3-cleft ; ache- 

 nium compressed-triangular, sharply acuminate. 



Wet meadows and swamps. Mass. to Penn. W. to Ken. June, July. %. 

 — Culm about 2 feet high, leafy nearly to the top, smooth. Spikes many-flow- 

 ered, in an unequal cyme or umbel. Scales dark green, at length becoming 

 brownish. Bristles 6, slender, hispid downwards. Dark-green Club Rush. 



