Vascular Plants of North Carolina
Account for Three-way Sedge - Dulichium arundinaceum   (L.) Britton
Members of Cyperaceae:
Only member of Dulichium in NC.
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Section 5 » Order Cyperales » Family Cyperaceae
Author(L.) Britton
DistributionMostly Coastal Plain; fairly well distributed in the Mountains, but only scattered in the Piedmont. Seemingly absent in the east-central Piedmont.

Lab. to B.C. south to FL, TX, and CA.
AbundanceCommon in the Coastal Plain and adjacent northeastern Piedmont; uncommon and scattered in the Piedmont; infrequent to frequent in the Mountains.
HabitatSwamp forests, small stream swamps, beaver ponds, marshes, wet roadside ditches, montane bogs.
See also Habitat Account for General Sedge, Grass, and Rush Mires
PhenologyFlowering and fruiting July-October.
IdentificationPlants are clonal from elongate rhizomes, with the stems mostly 1-2 feet tall. The lower leaves are reduced to bladeless sheaths. Viewed from directly above, the middle and upper leaves are strictly 3-ranked (in 3 rows vertically), a distinct feature. The flowers occur in the upper part of the stem, from leaf bases, the spilkelets being slender and brownish. Not surprisingly, this quite distinctive species (at least when viewed from above!), is in its own genus.
Taxonomic CommentsTechnically, our plants are var. arundinaceum; var. boreale occurs in Quebec.

Other Common Name(s)None
State RankS5
Global RankG5
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