Bogs and Acidic Peatlands of Southern New England by Marsha C. Salett
Carex trisperma Dewey
CYPERACEAE (Sedge Family)
EtymologyCarex is the classical Latin name for sedge; trisperma means three-seeded from the Latin: tri= three + spermo= seed, germ.
Synonyms (Common Name)Three-seeded Bog Sedge, Three-seeded Marsh Sedge
DescriptionA perennial sedge often found in coniferous peatlands, three-seeded sedge grows 8-28" tall in loose tufts of slender, delicate stems. It usually bears 2 short, uniform spikes per stem that are widely separated. Male and female flowers appear on the same spikes.
Wetland indicator statusOBL
Plant Height8-28 inches
LeavesSlender, to 1/16" wide.
Flower/InflorescenceSpikes all alike; sessile, short (to 3/8"); usually 2, sometimes 1 or 3; 3/8 - 1 5/8" apart on stem; bristle-like bract under lowest spike is much longer than spike; 1-5 perigynia per spike. Perigynia (inflated sacs surrounding pistil or achene) oval, to 1/8" long, with smooth, short beak; in cross section flat on one side, convex on the other.
FruitAchene, lens-shaped.
Fruiting PeriodJune-August.
HabitatConiferous bogs, coniferous or deciduous swamps, wet woods.
RangeNewfoundland Alaska, south to Pennsylvania, Minnesota, and California.
(c) 1998-2006 Marsha C. Salett