Y30 Order 155.— CYPERACE2E. 



dato with a short bristle; ach. twico tho length, of the gtipe. — Bogs and swamps, 

 Mass. to Midi., S. to Fla. and La. 

 ji. pumila. Culm a few (3 to C) inches high , spikes 1, 2 or 3 ; glumes ovat> 

 lanceolate, with short awns ; petaloid scales ovate-lanceolate. 



2 F. hispida Ell. Culm triangular, sulcate, hispid above, 2 to 3f high ; Ivs. linear, 

 5 to 8' long, Hat, hispid-pubescent, ivith very hispid sheaths ; spikes 3 to 12, in clus- 

 ters of 3 to 6, ovoid-oblong, mostly terminal ; awns lowjer than the glumes, spread- 

 ing-recurved ; petals ovate, mucronate ; stam. 3, scarcely longer than the corolla ; 

 sty. twice as long as tho stamens. — Car. to Fla. and La. Differs from No. 1 

 chiefly in its hairiness. 



3 F. scirpoidea Mx. Culm slender, 1 to 2f high, 3-angled, striate, leafless, but 

 with several sheaths; spikes 1 to G, ovoid, terminal, dingy brown, not squarrous; 

 glumes short awned or cus])idate ; petals ovate, shorter than the claws ; stam. 3 ; 

 ach. triangular, pointed at both ends. — S. Ga. and Fla. Rhizomo creeping. Heads 

 as large as tho white bean. 



5. ELEOCH'ARIS, R, Br. Spiked Rush. (Gr 'iXoq, a marsh, x^P^t 

 to rejoice ; plants delighting in marshy grounds.) Spikes terete ; 

 glumes imbricated all around; bristles of the perigynium mostly G (3 to 

 12) rigid, persistent; style 2 to 3-cleft, articulated to the ovary; ache- 

 nium crowned with a tubercle which is the persistent, bulbous base of 

 the style. — Mostly 2f.. St. simple, leafless. Spike solitary, terminal. 



§ LIMXOCIILOA. Spike cylindrical, elongated (f), glumes rounded, pale, spirally arranged. 



Culms stout, 2 to 4f high Nos. 1, 2 



$ ELEOOlIAlvIS. Spikes ovoid or lanceolate, teretely imbricate (*). 



* Spike lance-oblong, length thrice greater than ti:e diameter (a). 



a Calms terete (1 to 2f). Spike rusty brown, 5 to lu" long No. 8 



a Culms flattened, hair-like, or thread-like, narrower than spike Nos. 4, 5 



a Culms 3-angled, stout, as broad as the spike. Lvs. ? floating No. 6 



* Spike ovoid-oblong, length less than thrice the diameter (b). 



b Spikes greenish white, globous-ovoid, 2 to 8" long. South Nos. 7, 8 



b Spikes brown, or the glumes brown in the center (c). 



C Culms 4 or 5-angled, 2 to 12' high Nos. 9, 10 



C Culms terete, 8 to 14' high Nos. 11, 12 



C Culms flat. — Bristles 4 to C, longer than the. nchenium Nos. 13,14 



— Bristles few, shorter than the ach. or none Nos. 15, 16 



8 CII.r.TOCYPERUS. Spike flat, glumes imbricated in 2 or 3 rows. Culms capil- 

 lary, — 1 to 8' hicch, never proliferous at tho top Nos. 17, IS 



— ."» to 12' long, often proliferous at the top Nos. 19, 20 



1 E. cqnisetoides Torr. Culm about 2f high, papiUous, terete, 2 — 3" diam., with 

 about 20 joints, produced by internal, transversa partitions; sheath radical, obtuse, 

 membranous; spike oblong cylindrical, about 1' in length, acute and slightly con- 

 tracted at base ; glumes roundish-ovate, cartilaginous, obtuse ; bristles G, as long 

 as tho achenium ; sty. 3-cleft ; ach. brown, shining. — Bogs, Cumberland, R.I. 

 (Olney), Del. to Ga. It strikingly resembles Equisetum hyemale. 



2 E. quadrarigulata R. Br. Culm 2 — 4f high, acutely and unequally quadran- 

 gular, the broadest side convex, the others concave; sheaths radical, purplish; 

 spike 1' or more in length ; glumes roundish-ovate, obtuse, coriaceous ; bristles G ; 

 ach. obovate, of a dull white. — Penn., Md. (Robbins),to Ga. and La. In swamps 

 and inundated banks. 



3 E. palustris R. Br. Rhizomes creeping; culms subtereto (slightly 4-sided 

 below), spongy, 9' to 2f high, varying from filiform to 1J" diam. ; spikes oblong- 

 lanceolate, rather obtuse, 3 to 6 to 10" long, many-flowered; glumes oblong- 

 ovate, obtuse, rusty or tawny brown, with a broad, loese, scarious margin, the 

 lowest enlarged ; aeh. obovate, smooth, shining, yellowish. 



j3. calva. Bristles none ; culms filiform. — W. N. Y. (E. calva Torr.). 



4 E. intermedia Shultes. Tufted culms setaceous, diffuse, compressed, fur- 

 rowed, hard, wiry, G to 8' long; spike lance-ovate, acute, 2 to 3" long, 7 to ^-flowered; 

 glumes, lance-ovate, acute, reddish-brown, with a green midvein ; bristles 6, 

 white, longer than the achenium ; sty. 3-cleft ; ach. obovate, attenuated to the 

 base, striate, of a light brown color. — In running water, forming a denso turf, N 

 EL to Ga., W. to Ohio. JL 



