CYl'ERACEiE. 571 



margin; style S-fd; achenium pale, obovatc, constricted at the base, biconvex, nearly 

 smooth, half as tony ayain as the subulate tubercle, exceeded by the bristles. — Elcocharis, 

 Schult. Limnochloa, Ns. S. geniculatus, Mey. Esseq. ! (Elcocharis, PI. Hostm., As. Gr. 

 in PI. Ervendbery.).—3'-V high ; spikelet 12"'-6"' long, 4"'-3'" thick, rusty, or rusty-varie- 

 gated : bristles reaching to the summit of the beak. — Hab. Jamaica !, Wits., Wullschl., in 

 water; Dominica !, Ivir.; [Cuba ! aud Mexico ! to Brazil]. 



51. S. plantagineus, /,., Sw. Stem terete, thickish, knotted: sheaths with a deltoid 

 point ; spikelet cylindrical, nearly as big as the stem below its slightly constricted summit ; 

 ylumes many-ranked, cartilayinous-scarious within the membranaceous margin, striate, obo- 

 vate-roundish ; style %-fid ,• achenium pale, obovate, biconvex, longitudinally striate, half 

 as lony ayain as the subulate tubercle, slightly exceeded by the bristles. — SI. t. 81. f. 3. — ■ 

 Limnochloa, Ns. L. articulata, PI. Spruce. 4278. S. geniculatus, L. (ex parte), Rottb. 

 S. interstinctus, V. (Eleocharis, R. Br.). Elcocharis mutata, Weiyelt. Sarin. I (non R. Br.). 

 E. equisetoides, Torr. — 3'-2' high, big ; spikelet pale, 9"'-2" long ; bristles exceeded by the 

 beak. — Hab. Jamaica !, Pd., Al., Wils., in water ; S. Vincent !, Guild. ; [Louisiana ! aud 

 Cuba ! to Brazil !]. 



**** Stem triquetrous, knotless. 



52. S. mutatus, L. Stem triquetrous, knotless : sheaths with a deltoid point ; spike- 

 let cylindrical, bluntish, nearly as big as the stem below its slightly constricted summit ; 

 glumes many-ranked, cartilayinous-scarious within the membranaceous margin, striate, del- 

 toid-roundish, blunt; style Z-fid ; achenium pale-brown, obovate, biconvex, nearly smooth, 

 twice as lony as the conical-subulate tubercle, slightly exceeded by the bristles. — Elcocharis, 

 R. Br. Limnochloa, Ns. — l'-2' high; spikelet pale, 9"'-18'" long; bristles reaching to 

 the summit of the beak. — Hab. Jamaica!, Pd., Wils., lagoons; Antigua!, Wullschl.; 

 [French islands !, Sieb. Mart. 10 ; Mexico to Uruguay !]. 



Sect. 2. EusciRPUS. — Achenium naked, supported by bristles. — Spikelets cymose-panicled 



in our species. 



53. S. validus, V. Stem terete, stout, aphyllous, produced beyond the umbelliform 

 panicle; spikelets glomerate, ovate-oblong, brown; glumes ovate-roundish, mucronate, 

 ciliate ; style 2-Jid ; achenium pale, obovatc, mucronate, Jlat-conver, smooth, shorter than 

 the bristles. — 6-10' high, about 10'" thick below : one form quite leafless ; achenium 

 scarcely 1'" long, half as large as in S. lacustris, but broader than in S. Tabernamontani. 

 — Hab. Jamaica !, Pd., in salt marshes and lagoons ; [United States !, Mexico]. 



Sect. 3. FiiiBRiSTYLis, V. — Achenium naked: no bristles. Style deciduous. — Most 

 leaves rosular, and spikelets cymose in our species. 



+ Achenium S-anyular ; style thickened at the base (Trichelostylis, Lestib.). 



54. S. autumnalis, L. Annual, csespitose, glabrous ; stem compressed ; leaves 

 linear -acuminate, flat ; cyme terminal, umbelliform, exceeding the involucre ; spikelets 

 brown, oblong (or ovate), pointed ; glumes ovate, mucronate ; style 3-fid ; achenium pale, 

 obovate-roundish, 3-gonal, smooth. — Fimbristylis, R. S. Trichelostylis mucronulata, Torr. 

 — 2' high ; spikelets 3"'-l"' long : rhachis foveolate. — Hab. Jamaica !, Antigua !, Wullschl. ; 

 [United Slates ! to Brazil !]. 



55. S. amentaceus, Gr. Perennial, erect, glabrous; stem compressed; leaves linear, 

 acute, flat ; cyme terminal, compound-umbelliform, exceeding the involucre; spikelets brown, 

 lanceolate-oblong, pointed ; glumes ovate-oblong, mucronate ; style "3-tid ; achenium pale, 

 obovate-roundish, 3-gonal, muricate. — Rudye, Gnian. t. 19. — Cyperus, Rudy. Triche- 

 lostylis Rudgeana, Ns. — 1'-3' high , spikelets 3'" long : furrows of the rhachis winged. — 

 Hab. Dominica !, Imr., S. Vincent !, Guild. ; Trinidad !, Cr. ; [French islands 1 to Brazil !]. 



ft Achenium dorsally compressed ; style cylindrical. 



56. S. obtusifolius, V. Perennial, erect, polished ; stem compressed, naked above 

 the densely rosulate leaves ; leaves riyid, linear, rounded at the top, concave ; cyme terminal, 

 contracted or the primary rays expanded, usually longer than the short involucre ; spikelets 

 clustered, ovate, blunt; glumes brown, pale at the margin, ovate-oblong, blunt; style 



2 p 



