1^36 Order 155.— CTPBRACRS!. 



date with a short bristle; aeh. twice the length of the stipe. — Boga and awamps, 

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

 /3. PIIMIL.4.. Culm a few (3 to 6) inches high , spike.? 1, 2 or 3 ; glumes ovate- 

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



2 F. hispida Ell. Oulm triangular, sulcata, hispid above, 2 to 3f high ; tos._ linear, 

 5 to 8' loag, flat, hispid-pubesceni, with very hispid sheaths; spikes 3 to 13, in dus- 

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

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

 sty. twice as long as the stamens.— Oar. to Fla. and La. Differs from No. 1 

 chiefly in its hairiness. 



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

 with several sheaths ; spikes 1 to 6, omid, tenninal, 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, R. Br. Spiked Eush. (Gr t'Xof, a marsh, ;v;o(p6), 

 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- 

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

 the style. — Mostly 7i. St. simple, leafless. Spike solitary, terminal. 



§ LIMNOCHLOA. Spiko cyllndi-ic.il, clongatetl (!'), glumes rounded, pale, spirally arranged. 



Oulms stoat, 2 to 4f bigh Nos. 1, 2 



§ KLE0CIIARI3. Spikes ovoid or lanceolate, teretely imbricate (*). 



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



a Culms terete (1 to 21^. Spike rusty brown, 5 to 10" long No. S 



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



a Culms 8-anglcd, stout, as brofid as the spike. Lvs. ? floating No. 6 



* Spike ovoid-oblong, length less tlian thrice tlie diameter (b). 



b Spikes grccnislt white, globous-ovoid, 2 to 3" 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 



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



G Culms fl.at. — Bristles 4 to 6, longer than the achenium Nos. 13, 14 



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



§ CHjETOCTPEEDS. Spike flat, glumes imbricated in 2 or 8 rows. Culms capil- 

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



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



1 JEJ. equisetoides Torr. C^jZm about 2f high, ^opiZfoaij, ierefc, 2 — 2" dia!m.,wHh 

 about 20 joints, produced by internal, transverse paniiions ; sheath radical, olDtuse, 

 membranous; spite oblong cylindrical, about 1' in length, acuta 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, E. 1. 

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



2 B. quadrangul^ta E. Br. Oulm 2 — 4f high, acutebj 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. (Eobbins) ,to Ga. and La. In swamps 

 and inundated banks. 



3 E. pallistris R. Br. Khizomes creeping; culms subtereto (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, loose, scarious margin, the 

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



/3. OALTA. Bristles none ; culms filiform.— W. N. T. (E. calva Torr.). 



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

 rowed, hard, yiriry, G to 8' long; spike lance^ovate, acute, 2 to 3" long, 1 to 9-floweredi 

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

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

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

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



