310 North American CypcracciXi 



whithii ot light brown colour, much shorter than the scale , distinctly 

 triangular, the sides strongly corrugated, and marked likewise by fine 

 longitudinal lines, the summit abruptly contracted into a short neck, on 

 tvhich the minute tubercle stands^ 



Hab. Bogs, generally growing partly in the tt'Eiter. Com- 

 mon in New York and New Jersey ! ; Pennsylvania, Muhlen- 

 berg!, Dr^ Darlington! ; Salem, Massachusetts, Dr^ Picker- 

 ing!; Arkansas, Dr. Pitcher! 



Obs. Nees ab Esfenbeck, in the Linnaea, vol. 9, refers Scir- 

 yus tenvis, JVilld. hoih to Scirpidium and Eleocharis! It is 

 probable that the latter reference is a mistake, and that he cOil- 

 sidered the plant as S genuine spfecies of his genus Scirpidium* 



/?* nut not wrinkled j bristles 3—^4, one-third the length of 

 ihe nuti 



Calm a foot high, a:ctftely triafigu'lai'. Sjnke ovate, acute. Scales 

 t>vate-oblong, obtuse. Nut obovatc, minute, whitish, the angles pfOmi- 

 iient. Tuherde shorty with a minute abrupt poirif .■ 



Hab. Near New Orleans, Drs Ingalls ! 



Obs. TMs variety resembles the common E, tenuis in 

 Jiearly all respects except in the smooth and less rounded nttt. 

 It forms the connecting link between that species arid JE.- tri- 

 eostafa. 



1&. Eleocharis tricostaIta. 



Culm subcompressed, filiform, striate; spike C5^Iirid'fic£Ll^ 

 6blong, densely-flmtered j scales ovate, obtuse, membrana- 

 ceous ; bristles ; nut obovate, triangular, the angles very pro- 

 minent and thickened ; sides convex, roughened '^ith Very 

 minute vtrinkles ;' tubercle shortj conical, acute. 



Culm 1—2 feet high, half a line in diameter, smooth, ii'ot angular. 

 Spike 5—9 lines in length, and a line and a half in diameter, somewhat 

 pointed at the summit. Scales mostly ovate, very obtuse, ferrugihotfSi 

 with a broad scarious margin; the midrib green. Bristles entirely 

 wanting. Sta77iens 3. Nut very small, brown, dull, appearing 



