736 ORDER 155. CYPERACEJE. 



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

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



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

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



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

 5 to 8' long, flat, hispid-pubescent, with very hispid sheaths; 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 e/U>, a marsh, 

 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 2f.. St. simple, leafless. Spike solitary, terminal. 



LIMNOCHLOA. Spike cylindrical, elongated (I 7 ), glumes rounded, pale, spirally arranged. 

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



ELEOCHARIS. 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-lik or thread-like, narrower than spike ............ Nos. 4, ft 



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, globons-ovoid, 2 to 3" 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' hii.'h ................................... Nos. 9, 10 



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



C Culms flat. Bristles 4 to 6, longer than the achenium ............. Nos. 13, 14 



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



CII^ETOCYPERUS. Spike flat, glumes imbricated in 2 or 8 rows. Culms capil- 



lary,! to 8' high, never proliferous nt the top .............................. Nos. 17, IS 



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



1 ,E. equisetoides Torr. Culm about 2f high, papittous, 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 6, as long 

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

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



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

 gular, tho 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. (Robbins),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 H" diam. ; spikes oblong- 

 lanceolate, rather obtuse, 3 to 6 to 10" long, niany-llowered ; glumes oblong- 

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

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



(3. 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 ^-flowered, 

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

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

 base, stria! e, of a light brown color. In running water, forming a dense turf, N. 

 H. to Ga., "W. to Ohio. Jl 



