CYPERACEJE, 409 



2. S. de'bilis. 



Sum cffispitose, roundish, deeply striate, 9 — 16 inches hi^h, with a few 

 subulate leaves at base ; spikelets about 3, short-ovoid, sessile, crowced, sub- 

 terminal; glumes ovate, obtuse, carinate, pale-green; ackenium obovate, 

 mucronate; bristles 4 — 5. Borders of ponds. Aug. 



3. S. LACu'sTRis. S. acutus. Mnli. 

 Scope smooth, leafless, filled with a porous pith, 5 — 8 feet high, cylindric, 



tapering above the panicle, and abruptly ending in a short cusp; panicle 

 cymose near the top; peduncles rough, twice compound; spikelets ovoid, 

 closely imbricate ; scales ovate, mucronate, pubescent ; bracts shorter than the 

 panicle. The largest species of buUrush, frequenting the muddy margins of 

 rivers and ponds. July. 



§ 2. Ovar>- invested with tortuous, capillary, scarcely hispid setse. Style -S-cIeft, not bul- 

 bous at base, deciduous. Spikelets numerous, terminal, in cymes or panicles. Stem 

 leafy. Trichophorum. 



4. S. atrovi'rf.ks. Muh. 



Stem obtusely triangular, leafy, 2 feet liigh ; cyme terminal, compound, 

 proliferous ; involucre of 3 leaf-like bracts, longer than the cyme ; spikes ovate, 

 acute, crowded, 10 — "20 in a globose head ; heads numerous, ^ inch in diame- 

 ter, dark green ; gluvics ov'iiXe, mucronate; ac/tenium white, smooth ; bristles 



4. Common in wet meadows. June, July. 



5. S. bru'nneus. Muh. 



Stem obtusely triangular, leafy, 2 — 3 feet high ; cyme decompound, its 

 principal branches about 5, unequal, with truncate sheaths at base ; fpikclcts 

 clustered in heads of 3 — G; .^.MJrtes obtuse, reddish brown ; a^/ie/iZMm smooth, 

 yellowish white, shorter than the 4 or 5 tortuous bristles. Much resembles 

 the la.st species. Margins of waters. Rare. Aug. Sept. 



6. S. mari'timus. 



Strrn acutely 3-angled, leafy. 2 — 3 feet high; Peaces broad-linear, rough- 

 edged, carinate, taller than the stem ; spikes conglomerate, G — 10, nearly an 

 inch long, corymbose ; iiivulucrc of about 3 very long leaves ; glumes ovate, 

 3-cleft, the middle segment subulate and reflexed ; style 3-cleft; bristles 4. 

 Salt maishes. Aug. 



7. S. Rrio'phokum. Mx. Trichophorum cyperinum. Pers. 

 Stem obtusely triangular, leafy, 3 — 5 feet high ; leaves 2 feet long, rough- 

 edged ; panicle umbellate, decompound, large and loose ; bristles G, capillary, 

 curled, very conspicuous, being o or G times as long as the white achenium. 

 A common, stiff, rank meadow grass, which cattle do not eat. Spikelets 

 numerous, small, ovoid, obtuse, in small clusters. Involucre 4-leaved. Aug. 



8. S. linea'tus. Mx. Trichophorum lineatum. Pcrs. 

 Stem triangular, very leafy, 2 — 3 feet high ; panicles terminal and axillary, 



decompound, at length nodding; involucre of 1 — 2 bracts, longer than the 

 leaves; spilics ovoid, pedunculate, solitary ; glumes lanceolate, ferruginous; 

 bristles 6, as long as the glumes. Swamps. Aug. 



i 3. Ovary invested with setcB. Style 2— .'3-cleft, articulated to the achenium, with a dilat- 

 ed or bulbous, persistent base. Spikelet solitary, terminal. Setae straight, retrorsely 

 liispid. Eleocharis. 



9. S. tf.'kuis. Slender Club rm^h. 



Stem leafless, almost filiform, quadrangular, the sides snlcate, 8 — 15 inches 

 high, with a long, purple sheath at base ; spike terminal, elliptic-oval, acute 

 at each end ; glumes dark purple, ovate, obtuse, the lower ones larger and 

 empty; ovary roundish, tapering below, invested with 2 or 3 or setce. Com- 

 mon in wet places. June, July. 



10. S. p.\Lu'STRis. Marsh Club rusji. 



Stem leafless, round, inflated ; s/)t7tc/.?/s smooth and shining, lance-oblong, 

 acute, often oblique, terminal ; glumes subacute, the lower ones larger, some- 

 limes e.-npty. Wet grounds. Root creeping. Stems numerous, 1 — 2| feet 



