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Juncus tenuis Willd.
SLENDER RUSH
Juncus dudleyi Wiegand; Juncus macer Gray; Juncus tenuis var dudleyi (Wiegand) FJ Herm; Poverty Rush; Path Rush

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Juncus tenuis
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Juncus tenuis
Juncus tenuis
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Juncus tenuis

Juncus tenuis
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Juncus tenuis
Juncus tenuis
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Juncus tenuis

Juncus tenuis
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Juncus tenuis
Juncus tenuis
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Juncus tenuis

Juncus tenuis
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Juncus tenuis
Juncus tenuis
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Juncus tenuis

Juncus tenuis
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Juncus tenuis

Juncus tenuis
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Juncus tenuis
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Juncus tenuis
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Juncus tenuis
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Juncus tenuis

Associates · map
FamilyScientific name @ source (records)
Aphididae  Prociphilus ( @ NCSU (2)
Cintractiaceae  Cintractia junci @ BPI (135)
Phaeosphaeriaceae  Leptosphaeria eustoma @ 864575A (1); 867665A (1)
Phyllachoraceae  Phyllachora junci @ BPI (2)
Pucciniaceae  Uromyces junci-effusi @ 189669A (1)

Uromyces junci-tenuis @ BPI (1)

Uromyces junci @ 009395A (1); BPI (18)

Uromyces silphi @ BPI (1)

Uromyces silphii @ 016960A (1); 016910B (1); 016890A (1); 016910A (1); 016960B (1); BPI (130); 016890B (1)

Uromyces @ 864575B (1)
Ustilaginaceae  Ustilago junci @ BPI (5)
_  Darluca filum @ 009395B (1); BPI (4)

Uredo @ BPI (1)

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FNA | Family List | FNA Vol. 22 | Juncaceae | Juncus

24. Juncus tenuis Willdenow, Sp. Pl. 2(1): 214. 1799.

Path rush

Juncus bicornis Michaux; J. bicornis var. williamsii (Fernald) Victorin; J. macer Gray; J. macer forma williamsii (Fernald) F. J. Hermann; J. macer var. williamsii (Fernald) Fernald; J. tenuis var. bicornis (Michaux) E. Meyer; J. tenuis var. multicornis E. Meyer; J. tenuis var. williamsii Fernald

Herbs, perennial, tufted, 1.5--5 dm. Rhizomes densely branching. Culms few--20. Leaves basal, (1--)2--3; auricles 2--5 mm, apex acute, membranous; blade flat, 3--12 cm x 0.5--1 mm, margins entire. Inflorescences 5--40-flowered, borne congested or branch internodes ca. as long as tepals, ssomewhat loose, 1--5 cm; primary bract usually longer than inflorescence. Flowers: bracteoles 2; tepals greenish, lanceolate, 3.3--4.4 mm; outer and inner series nearly equal; stamens 6, filaments 0.5--0.9 mm, anthers 0.1--0.2 mm; style 0.1--0.2 mm. Capsules tan or light brown, 1-locular to pseudo-3-locular, ellipsoid, (3.3--)3.8--4.7 x (1.1--)1.3--1.7 mm, nearly equal to tepals. Seeds tan, ellipsoid to lunate, (0.52--)5.5--0.65(--0.7) mm, not tailed. 2n = 80.

Flowering spring--early summer. Exposed or shaded sites in soils ranging from sandy to clayey under moist or drier conditions, oftentimes these sites naturally or otherwise disturbed (e.g., game or human trails); Alta., B.C., Man., N.B., N.S., Ont., P.E.I., Que., Sask.; Ala., Alaska, Ariz., Ark., Calif., Colo., Conn., Del., D.C., Fla., Ga., Idaho, Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Mont., Nebr., Nev., N.H., N.J., N.Mex., N.Y., N.C., N.Dak., Ohio, Okla., Oreg., Pa., R.I., S.C., S.Dak., Tenn., Tex., Utah, Vt., Va., Wash., W.Va., Wis., Wyo.; introduced worldwide.

Juncus tenuis occurs throughout North America. It is particularly abundant in northeastern United States and eastern Canada, although infrequent in the south and west.

Through the use of isozyme electrophoresis, hybridization can be demonstrated between various members of the Juncus tenuis complex, including Juncus tenuis, J. anthelatus, J. interior, J. secundus, and J. dichotomus (R. E. Brooks, unpubl.). Juncus ××oronensis is thought to be a hybrid between J. tenuis and J. vaseyi in the northeast.

Updated: 2020-09-20 21:13:04 gmt
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