730 ORDER 155. CYPERACE^E. 



date with a short bristle ; ach. twice the length of the stipe. Bogs and swamps, 

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



/?. PUMILA. Culm a few (3 to 6) inches high , spikes 1, 2 or 3 ; glumes ovate- 

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



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

 5 to 8' long, flat, hispid-pubescent, with very hispid sheatJis; spikes 3 to 12, in clus- 

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

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

 sty. twice as long as the 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 6, ovoid, terminal, dingy brown, not squarrous ; 

 glumes short awned or cuspidate ; petals ovate, shorter than the claws ; stam. 3 ; 

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

 as large as the white bean. 



5. ELEOCH'ARIS, R. Br. SPIKED RUSH. (Gr tAof, a marsh, %aip(*), 

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

 glumes imbricated all around; bristles of the perigynium mostly 6 (3 to 

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

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

 the style. Mostly 11. St. simple, leafless. Spike solitary, terminal. 



LIMNOCHLOA. Spiko cylindrical, elongated (I/), glumes rounded, pale, spirally arranged. 



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



ELEOCHAIIIS. Spikes ovoid or lanceolate, teretely imbricate (*). 



* Spike lance-oblong, length thrice greater than the diameter (a). 



a Culms terete (1 to 2f). Spike rusty brown, 5 to 10" long No. 3 



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). 



O Culms 4 or 5-angled, 2 to 32' high Nos. 9, 10 



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



C Culma flat. Bristles 4 to~ 6, longer than the nchcnium Nos. 13, 14 



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



S CHJ2TOCYPEEUS. Spike flat, glumes imbricated in 2 or 3 rows. Culms capil- 

 lary,! to 8' high, never proliferous at the top Nos. 17, 13 



5 to 12' long, often proliferous at the top Nos. 19, 20 



1 E. equisetoides Torr. Culm about 2 f high, papillous, terete, 2 3" diam., with 

 about 20 joints, produced by internal, transverse 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 the achenium ; sty. 3-cleft ; ach. brown, shining.' Bogs, Cumberland, R. I. 

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



2 E. qnadrangulata 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 6 ; 

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

 and inundated banks. 



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

 below), spongy, 9' to 2f high, varying from filiform to 1 J" 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, locse, scarious margin, the 

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



ft. CALVA. Bristles none ; culms filiform. W. N. Y. (E. calva Torr.). 



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

 rowed, hard, wiry, 6 to 8' long; spike lance-ovate, acute, 2 to 3" long, 7 to 9-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 dense turf N 

 E. toGa., W. to Ohio. JL 



