CYPEKACEjE. 57 l 



margin; style Z-fid ; achenium pale, obovate, constricted at the base, biconvex, uearli/ 

 smooth, half as long again as the subulate tubercle, exceeded by the bristles. — ^Eleocharis, 

 Schult. Limuochloa, Ns. S. genioulatus, Mey. Esseq. ! (Eleocharis, PI. Hostm., As. Gr. 

 in PI. Ervendberg.).~W-\.' high ; spikelet 12"'-6"' long, 4"'-3"' thick, rusty, or rusty-varie- 

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

 water ; Dominica !, Imr. ; [Cuba ! and Mexico ! to Brazil]. 



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

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

 glumes many-ranked, cartilaginous-scarious within the membranaceous margin, striate, obo- 

 vate-roundish ; style i-fid ; aehenimn pale, obovate, biconvex, longitudinally striate, half 

 as long again as the subulate tubercle, slightly exceeded by the bristles. — SI. t. 81. /. 3. — 

 Limnochloa, Ns. L. artieulata, PI. Spruce. 4278. S. genioulatus, L. Cex parte), Rottb. 

 S. interstinctus, V. (Eleocharis, R. Br.). Eleocharis mutata, Weigelt. Surin. ! {nonR. Br.). 

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

 beak. — Hab. Jamaica !, Pd., A.I., Wils., in water ; S. Vincent !, Build. ; [Louisiana ! and 

 CubaltoBrazU!]. 



**** Stem triquetrous, knotless. 



52. S. mutatns, L. Steratriquetrous, knotless : sheaths with a deltoid point ; spike- 

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

 ghimes many-ranked, cartilaginous-scarious within tbe membranaceous margin, striate, del- 

 toid-roundish, blunt ; style S-Jid ; achenium pale-brown, obovate, biconvex, nearly smooth, 

 twice as long as the conical-subulate tubercle, slightly exceeded by the bristles. — Eleocharis, 

 i?. Br. Limnochloa, Ns. — 1'-2' high; spikelet pale, 9"'-18"' long; bristles ^reaching to 

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

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



Sect. 2. EusoiEPUS.^ j^c^eWM naked, supported by bristles. — Spikelets cymose-panicled 



in our species. 



f/^ 53. S. validus,_I'. Stem terete, stout, aphyllous, produced beyond the umbelliform 

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

 ciliate; style %-fid; achenium jale, obovate, mucronate, flat-convex, 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, hat broader than in S. Tabermsmontani. 

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



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



- - leaves rosular, and spikelets eymose in our species. 



+ Achenium i-angular ; style thickened at the base (Trichelostylis, Zestib.). 



l/ a. S. autumualis, 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-fld ; achenium pale, 



obovat'e-roundish, 3-gonal, smooth. — Embristylis, R. S. Trichelostylis mucrouulata, Torr. 



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



[United States I to Brazil!]. 



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

 acute, Rat; cyme terminal, compound-umbeUiform, exceeding the involucre; spikelets brown, 

 lanceolate-ohloug, pointed ; glumes ovate-oblong, mucronate; style S-M; achenium -piie, 

 ohovate-roundish, 3-gonal, muricate.—Rudge, Guian. t. 19.— Cyperus, Rudg. Triche- 

 lostylis Eudgeana, Ns.—V-%' high , spikelets 3'" long : furrows of the rhachis winged.— 

 Hab. Dominica !, Imr., S. Vincent !, Ghiild. ; Trinidad !, Cr. ; [Trench islands ! to Brazil !]. 

 •(■t Achenium dorsally compressed; style cylindrical. 



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

 the densely rosulate leaves ; leaves rigid, linear, rounded at the iop.concme ; cymetemunal, 

 contracted or the primary rays expanded, usually longer -than the shCrt mvolucre ; spike es 

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



