CYPKRACKJE. 395 



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

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

 side of the culm two\>r three inches from the top. Scales pale geeen. Bristles 

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



5. (S. triqueter Linn. : culm nearly naked, triangular or slightly winged, 

 two of the sides concave ; spikes 1 6, ovoid, aggregated and sessile ; 

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

 *S. Americanus Pursh. S. mucron&tus Pursh. 



Ponds and marshes. Throughout N. Amer. to the Arctic regions. July, Aug. 

 1J-. Culm 35 feet high, slender, mucronate, very acutely triangular, some- 

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

 colored. Bristles 35, slender, retrorsely hispid. Used for' the bottoms of 

 chairs. Chairmakcr's Rush. 



6. S. miicronatus 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. TJ-. 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. S. 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, ciliate ; achenium obovate. convex 

 on the back. *S. acutns Muhl. S, validus Pursh. 



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

 June, July. 7L Culm 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 46, stout, hispid. Tall Club Rush. Bulrush. 



-f-f 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. robuslus Pursh. S. 

 macrostachi/os Muhl. (in part.) 



Salt marshes and ditches. Subarct. Amer. to Flor. July, Aug. r Zj-. 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 Rush. 



9. S. atrovirens MM. : culm 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. *Z|.. 

 - 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. 



