OBDEB 154 CYPERACEJE. 361 



oblong, 4 6" ; glumes 2040, ovate ; ach. blackish when ripe, covered by a broad 

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



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

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

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



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

 69''; glumes obtuse, rusty-brown, crowded; setae 0; ach. sharply 3-angled, roughish, 

 tubercle conical. N. J., and S. A variety has smaller spikes. (Dr. Feay.) 



$0 E. arenicola Torr. Culms flattish, erect, 6 12', wiry ; spk. ovate, obtuse ; gls. 

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



2 1 E. Baldwin!! Torr. Culms 414', capillary, 4-angled, densely tufted ; spike 1", 

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



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

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



24 E. pusillus (Vahl.) Culms bristleform, 1 5', compressed ; spk. ovate ; gls. 3 6, 

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



6. SOIKPUS, L. CLUB-RUSH. BULLRTJSH. Glumes imbricated on all 

 sides. Perianth of 36 setae, persistent. Sty. 2-3-eleft, not tubercnlate at 

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

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

 bous, usually rust-colored. 



TRICOPHORUM. Setae 6, not barbed, tawny, tortuous, much longer than the aciie- 



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



SCIRPUS. Setae downwardly barbellate, about equalling the achenium (*) 



* Spike single, terminal. a Involucral bract in No. 1, 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, jointless, leafless or with a few short Ivs at base. . .Nos. 6 8 



c Culms triangular, jointless. d Spikes in a single cluster Nos. 911 



d Spikes in a cyme, bracted No. 12 



x Spikes large (615"), oblong, with cleft gls. Culm jointed, leafy. Nos. 13,14 

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

 x Spikes small (2 3"), all separate and pendulous. South No. 18 



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



; spk. oval. 12'' ; gls. brown, 59 ; ach. 3-angled, netted, beaked but not tubercled. 

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



2 S. caespitosus L. Culm round, wiiy, 3 10 7 , sheathed below with rudiments of 



leaves ; spike ovate, 2 3", with an involucral bract same length ; seta3 6, longer 

 than the achenium. High Mountains, N. and S. In tufts. Leaves 36". 



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



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

 spike (3 5"); glumes pointless. N. Y. (Clinton. Porter.) 



4 S. planifolius Miihl. Culms If, 3-angled, threadform, with several Jinear flat 



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



5 S. subtermiimlis Torr. Culm 1 3f, filiform, with several long capillary floating 



leaves: bract 1 2', exceeding the oblong (V) spike, continuous with the culm. N. 



6 S. debilis Ph. Culm roundish, furrowed, in tufts, 9 16', with a few subulate Ivs. 



at base or ; spk. 17, ovoid, crowded, 3", tawny, the culm-leaf above them 24' 

 at length reflexed ; bristles 4 6, inversely barbed ; ach. smooth. Muddy shs.Ct.to Car. 



