ORDEK 154. CYPERACE^E. 361 



oblong, 4 6" ; glumes 20 40, ovate ; ach. blackish when ripe, covered by a broad 

 tubercle which is abruptly-pointed ; setae 3, purple. Sandy bogs, E. and S. 



18 E. tenuis Schultes. Culms filiform or wiry, 4-angled, tufted, 8 18'; ppk. ellipti- 

 cal or oval 2 3"; gls. dark-purple, obtuse, 20 +; ach. roughieh, the tubercle broad- 

 depressed, setae 2 or 3, very short. A variety has the culms capillary. Wet places : com. 



U E.> tricostata Torr. Culm flattened, slender, 1 2f; spike oblong-cylindrical, 

 t> 9 '; glumes obtuse, rusty-brown, crowded; setce 0; ach. sharply 3-angled, ronghish, 

 tubercle conical. N. J.,andS. A variety has smaller spikes. (Dr. f'eay.) 



JO E. arenicola Torr. Culms flattish, erect, 612', wiry; spk. ovate, obtuse; gla. 

 dark-brown, with hroad white margins : ach. yellowish, tubercle distinct. Sands, S. 



91 E. Baldwinll Torr. Culms 4 14', capillary, 4-angled, densely tufted; spike 1", 

 ovate, flat, often proliferous; gls. 5 10, in 2 rows; ach. strongly 3-angled. Ga., Fla. 



22 K. prolifera Torr. Culms filiform, flattened, erect or diffuse, 1020'; spike 3", 

 lance-ov., acute, often proliferous ; gls. 1015, pale ; ach. ribbed, tubercle distinct. S. 



23 E. aclcularis Br. Culms hair-like, 2 6'; spike elliptic-ovate, 1", acute ; glumes 

 48 ; itch, ovoid-triangular, longitudinally striate. Muddy places. 



24 E. |iiixflluM (Vahl.) Culms bristleform, 15', compressed ; spk. ovate ; gls. 3 6, 

 mostly empty ; ach. acutely triangular, smooth. Coasts. (E. pigmiea.) 



6. SC1KPUS, L. CLUB-HUSH. BULLRUSH. Glumes imbricated on all 

 sides. Perianth of 3 6 setae, persistent. Sty. 2-3-cleft, not tuberculate at 

 base, deciduous. Achenium biconvex or triangular. U Stems mostly tri- 

 quetrous, simple, rarely leafless. Spikes solitary, conglomerated, or corym- 

 bous, usually rust-colored. 



TRIUOPIIOKUM. Setse 6, not barbed, tawny, tortuous, much longer than the acne- 



nium and exserted. Culm leafy. Cyme decompound Nos. 19, 20 



SCIRPUS. Setse downwardly barbellate. about equalling the acheninm (*) 



* Spike single, terminal. a Involucral bract in No. I, long (!') in No. 5 



a Involucral bract as short as the spike Nos. 2 4 



Spikes several or many, clustered b laterally on the culm (c) 



b terminally, mostly in cymes (x) 



c Culms terete, joiutless, leafless or with a lew short Ivs at base. . .Nos. 68 



c Culms triangular, jointless. d Spikes in a single cluster Nos. 9 11 



d Spikes in a cyme, bracted No. 12 



x Spikes large (615"), oblong, with cK-f't gls. Culm jointed, leafy. Nos. 13,14 

 x Spikes small (1"). mostly in globular heads. Culm jointed, leafy. Nos. 15 17 

 x Spikes small (% 3"). all separate and pendulous. South No. Ib 



1 S. paucifloriis Lightfoot. Culm filiform or capillary, erect, 3 8', leafless ; involucre 



0; spk. oval. 12" ; gls. brown, 5 9 : ach. 3-angled. netted, beaked but not tuber ded. 

 Otherwise an Eleocharis. Western N. Y. (Hankenson) to 111. (Porter). 



2 S. caespltosus L. Culm round, wiry, 3 10', t-ueathed below with rudiments of 



leaves; spike ovate, 2 3", with an involucral bract same length; setce 6, longer 

 than the achenium. High Mountains, N. and S. In tufts. Leaves 3 6". 



3 S. Cliiitonll Gr. Culm acutely 3-angled, If, very slender, base sheathed, with 



short bristle-shaped leaves ; bract subulate, shorter than the ovate chestnut-brown 

 spike (35") ; glumes pointless. N. Y. (Clinton. Porter.) 



4 S. plantrolltis Muhl. Culms If, 3-angled, threadform, with several -inear flat 



leaves ; bract as long as the oblong (2") spikes ; gls. pointed. N. Kng., N. Y. to Del. 

 o S. *ub term in alts Torr. Culm 1 3f, filiform, with several long capillary floating 



leaves : bract 12', exceeding the oblong (3") spike, continuous with the culm. N. 

 6 S. debiliM Ph. Culm roundish, furrowed, in tufts, 916', with a few subulate Iva. 



at base or ; spk. 17, ovoid, crowded, 3", tawny, the culm-leaf above them 2 4' 



at length reflexed ; bristles 4 6. inversely barbed ; ach. smooth. Muddy sliT-.ci.to Car 



