Vascular Plants of North Carolina
Account for Grassleaf Rush - Juncus marginatus   Rostkovius
Members of Juncaceae:
Members of Juncus with account distribution info or public map:
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Section 5 » Order Juncales » Family Juncaceae
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AuthorRostkovius
DistributionThroughout the state. It is possible that some of the counties mapped actually represent Bog Rush (J. biflorus) or Long's Rush (J. longii); specimens need close examination.

N.S. to Ont. and NE, south to south FL and TX; disjunct to CA and S.A.
AbundanceFairly common to common statewide.
HabitatWet sandy or muddy soils of marshes, beaver ponds, impoundments, meadows, seepage bogs, scrapes.
See also Habitat Account for General Wet Meadows
PhenologyFlowering and fruiting June-September.
IdentificationGrassleaf Rush is one of 3 NC species of rushes with flat leaf blades. Typically, Grassleaf Rush stems grow 1 to 1.5 feet tall (vs. 1.5-2.5 feet in Bog Rush and Long's Rush), and its leaves are narrower. It has an open inflorescence and thick but short horizontal rhizome as does Bog Rush (slender and long in Long's Rush). See Knapp and Naczi (2008) for details of this species and its close relatives.
Taxonomic CommentsSome manuals and references, such as FNA, continue to lump these 3 taxa, unnecessarily in our opinion.

NOTE on Juncus: These "grasslike" or "sedgelike" plants occur in most habitats, especially where moist or wet. They can immediately be told from grasses and sedges by the presence of 6 tepals (petal-like) that surround the fruit. These tepals can be thought of as analogous to sepals and petals of, say, lilies or trilliums. Most species have brown, chestnut, or reddish tepals and dark brown fruits. The flowers occur in few- to many-flowered heads. Leaves are nearly all basal and round in cross-section. Stems are unbranched, except for the inflorescence. Fruits are termed capsules and contain many tiny seeds.
Other Common Name(s)None
State RankS5
Global RankG5
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