310 North American Cypcracccc. 
whitish c)r light brown colour, much shorter than the scale, distinctly 
trianf;tilar, the sides strongly corrugated, and marked likewise by fine 
limgiiudinal lines, the summit abruptly contracted into a short neck, on 
wjiicli the minute tubercle stands. 
Hab. Bogs, generally growing partly in the water. Com- 
mon in New York and New Jersey ! ; Pennsylvania, Muhlen- 
berg!, Dr. Darlbigton ! ; Salem, IMassachusetts, Dr. Dicker- 
ing! ; Arkansas, Dr. Pkchcr! 
Obs. Nees ab Esenbeck, in the Linna^a, vol. 9, refers Scir- 
jiifs (e7ivis, TJilld. both to Scirpidium and Eleocharis! It is 
probable that the latter reference is a mistake, and that he con- 
sidered the plant as a genuine species of his genus Scirpidium. 
/?. nut not wrinkled ; bristles 3 — 4, one-third the length of 
the nut. 
Culm a loot high, acutely triangular. Sjnke ovate, acute. Scales 
ovate-oblong, obtuse. Nut obovate, minute, whitish, the angles promi- 
nent. Tnhcrrlc short, with a minute abrujit i>oint. 
Hab. Near New Orleans, Dr. Ingalls ! 
Obs. This variety resembles the common E. tenuis in 
nearly all respects except in the smooth and less rounded nut. 
It forms the connecting link between that species and E. tri- 
custatu. 
, 1-5. Eleochahis tricostata. 
Culm subcompressed, filiform, striate ; spike cylindrical- 
oblong, densely-flowered ; scales ovate, obtuse, membrana- 
ceous ; bristles 0; nut obovate, triangular, the angles very pro- 
minent and thickened ; sides convex, roughened with very 
minute wrinkles ; tubercle short, conical, acute. 
Culm 1 — 2 feet high; Iialf a line in diameter, smooth, not angular. 
Spike 5 — 9 lines in length, and a line and a lialf in diameter, somewhat 
f)ointed at the summit. Scales mostly ovate, very obtuse, ferruginous, 
wiili a broad scarious margin; tlie midrib green. Bristles entirely 
wanting. Stamens 3. Nut very small, brown, dull, ajjpearing 
