Y36 Obdbr 155.— CYPEEACEiE. 



date with a short bristle; ach. twice the length of the stipe. — Boga and swa^^)a, 

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

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

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



2 F. hfspida Ell. Culm triangular, sulcate, hi^id above, 2 to 3f high ; hs. linear, 

 5 to 8' long, flat, hispid-puiescent, with very hispid sheailis ; spikes 3 to 1 3, in dus- 

 ters of 3 to 6, ovoid-oblong, mostly terminal ; awns longer than the rjlumes, 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. soirpoidea Mx. Culm slender, 1 to 2f high, 3-angIed, 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. Ehizome creeping. Heads 

 as large as the white bean. 



5. ELEOCH'ARIS, E. Br. Spiked Rush. (Gr eXoc;, a marsh, X°''P<->, 

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

 flumes imbricated all around; bristles of the perigynium mostly C (3 to 

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

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

 the style.— Mostly 21. St. simple, leafless. Spike solitary, terminal. 



§ LIMNOCIILOA. Bpiko cylindrical, elongated (10, glumes rounded, pal?, spirally arranged. 



Culms stout, 2 to if higli Nos. 1, 2 



§ EI.EOCHAKIS. Spikes ovoid or lanceolate, teretely imbricate (*). 



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



a Culms tereto (1 to 20- Spike rusty brown, 5 to l(y' 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 loss than tin-ice the diameter (b). 



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



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



o Cnlms 4 or 6-angled, 2 to 12' high Nos. 9, 10 



o Culms terete, 8 to 14' high Nos. 11, 13 



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



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



5 CII.^TOCTPEEnS. Spike flat, ginmes imbricated in 2 or 3 rows. Culms capil- 

 lary, — 1 to 8' high, never proliferous at the top .Nos. 17, 13 



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



1 B. equisetoides Torr. Ckiimabont 2{ high, papiBous, terete, 2 — 3" diam.,mlh 

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

 membranous; iipife 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, E. I. 

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



2 E. quadrangiilata E. Br. C'ldm 2 — 4f JiigJi, acutely and unequally quadran- 

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

 spike 1' or more in length ; glmnes roundish-ovate, obtuse,- coriaceous ; hrisiles 6 ; 

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

 and inundated banks. 



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

 below), spongy, 9' to 2f high, varying from fiUform to IJ" 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, loose, scarious margin, tlie 

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



/3. OALVA. Bristles none ; culms filiform. — Vf. N. Y. (E. calva Torr.). 



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

 rowed, hard, wiry, 6 to 8' long; spike lance-ovate, acute, 2 to 3" long, 1 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 

 R to Ga., W. to Ohio. JL 



