Bogs and Acidic Peatlands of Southern New England by Marsha C. Salett
Taxonomy
Dulichium arundinaceum (L.) Britt.
CYPERACEAE (Sedge Family)
EtymologyDulichium is possibly from the Greek for Doulikion, an island in the Ionian Sea; arundinaceum means reed-like: from the Latin; arundo = reed + aceus = suffix for resembles.
DescriptionThreeway sedge is a leafy, perennial sedge that usually grows 8"-2' high, but can reach heights of 3 feet. Its leaf pattern sets it apart from most other sedges and grass-like plants; the perfectly 3-ranked leaves are borne from the base to the tip of the stem. Looking down from the top of the stem, one easily discerns the three distinct rows of leaves. Threeway sedge has round stems.
Wetland indicator statusOBL
Plant Height8-24 inches
LeavesStiff, short (2-6"), to 5/16" wide, three-ranked (in rows of three's); sheaths conspicuous.
Flower/InflorescenceSpikes 3/8 - 1 3/16" long, on stalks in upper leaf axils, consist of 7-10 sessile (unstalked) spikelets; spikelets brown, flat, narrow, 2-ranked; flowers inconspicuous, in axils of spikelet scales.
FruitAchene, beaked and flat.
Fruiting PeriodJuly-October.
HabitatBogs, wooded swamps, marshes, pond margins.
RangeNewfoundland to British Columbia; south to Florida and California.
(c) 1998-2006 Marsha C. Salett