Juncus roemerianus

Scheele

Linnaea 22:348. 1849.

Common names: Needle rush
IllustratedEndemic
Treatment appears in FNA Volume 22.

Herbs, perennial, 5–15 dm. Rhizomes long, thick, scaly. Culms gray-green, 2–5 mm diam. Cataphylls 2–5. Leaves basal, 1–3; auricles absent; blade terete, 40–80 cdm × 1.5–2.5 mm. Inflorescences sympodial or appearing lateral, glomerules to 150, each with 2–6 perfect or pistillate flowers, congested to open, 4–20 × 5–10 cm; primary bracts terete, longer than inflorescence. Flowers: tepals pale-brown, 2.5–3.3 mm, apex acuminate; outer series acuminate; inner series slightly shorter, acutish; stamens 6, sometimes rudimentary, filaments 0.2–0.7 mm, anthers 1.3–2.5 mm; style 0.3–1 mm. Capsules brown, 3-locular, ovoid to oblate, 1.7–3 × 1.3–1.6 mm, mostly distinctly shorter than perianth, apiculate. Seeds dark-brown, ellipsoid, 0.4–0.6 mm, not tailed.


Phenology: Flowering and fruiting spring–early fall.
Habitat: Coastal tidal marshes in dense zonal stands

Distribution

V22 264-distribution-map.jpg

Ala., Del., D.C., Fla., Ga., La., Md., Miss., N.C., S.C., Tex.as, Va.

Discussion

Selected References

None.

Lower Taxa

None.

"thick" is not a number.

... more about "Juncus roemerianus"
persistent +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
acuminate +
Ralph E. Brooks* +  and Steven E. Clemants* +
Scheele +
Juncus sect. Juncastrum +  and Juncus subg. Juncastrum +
mostly distinctly shorter +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
ovoid;oblate +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
Needle rush +
gray-green +
flattened +  and round +
Ala. +, Del. +, D.C. +, Fla. +, Ga. +, La. +, Md. +, Miss. +, N.C. +, S.C. +, Tex.as +  and Va. +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
pistillate +  and perfect +
arranged +  and cluster +
headlike +
Coastal tidal marshes in dense zonal stands +
few-flowered +
few-to-many +
congested +  and open +
4 cm40 mm <br />0.04 m <br /> (?) +  and 20 cm200 mm <br />0.2 m <br /> (?) +
pseudoaxillary +  and terminal +
5 cm50 mm <br />0.05 m <br /> (10 cm100 mm <br />0.1 m <br />) +
3 +  and 1 +
green;brown or purplish black +
persistent +
Flowering and fruiting spring–early fall. +
parietal +  and axile +
dark-brown +
not tailed;ellipsoid +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
green;brown or purplish black +
persistent +
Illustrated +  and Endemic +
rudimentary +
generally longer +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (?) +  and 0.1 cm1 mm <br />0.001 m <br /> (?) +
Juncus sect. Acuti +, Juncus sect. Maritimi +, Juncus sect. Thalassii +  and Juncus subg. Thalassii +
Juncus roemerianus +
Juncus subg. Juncus +
species +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.33 cm3.3 mm <br />0.0033 m <br />) +