Eleocharis Quadrangulata R. Brown, p. 141

16 Eleocharis quadrangulata, R.Brown.

Syn. Scirpus quadrangulatus Mx (not of Muhl)
S. marginatus Muhl. S. albomarginatus R. H.

Culm even, sharply quadrangular, three
of the sides concave, the fourth wider and flat; spike
cylindrical; scales broadly ovate very obtuse; bristles 6,
as long as the achenium which is obovate, striate
finely reticulated, and crowned with a conical flat-
tened distinct tubercle. Culm 2 to 4 feet high;
rhizoma thick and creeping. Flowers in
August.

Swamps and shallow margins of rivers,
growing in water. Illinois. Southern Indiana & Michigan.

Extends eastward to Pennsylvania, and
south to Louisiana.