Juncus filiformis

Linnaeus

Sp. Pl. 1: 326. 1753.

Common names: Thread rush
Illustrated
Treatment appears in FNA Volume 22.

Herbs, perennial, 0.2–3.5 dm. Rhizomes widely creeping, sparingly branched, 1.5–2 mm diam., nodes closely-set. Culms terete, 1 mm diam. Cataphylls several. Leaves: blade absent. Inflorescences 3–10 (–12) -flowered, loosely congested, 1–2 cm; primary bract terete, nearly equaling to much longer than culm. Flowers pedicellate; bracteoles broadly ovate, tepals light-brown or green, lanceolate, 2.5–4.2 mm; inner series loosely subtending capsule at maturity, slightly shorter, margins scarious; stamens 6, filaments 0.5–0.9 mm, anthers 0.5–0.7 mm; style 0.2 mm. Capsules tan, 3-locular, nearly globose, 2.5–3 × 1.8–2.1 mm, shorter than perianth. Seeds amber, 0.5–0.6 mm, not tailed. 2n = 40, 70, 80, 84.


Phenology: Flowering and fruiting summer.
Habitat: Usually sandy, moist or wet soil along stream banks, pools, lakes or in meadow depressions, rarely in bogs, frequently hidden by larger vegetation
Elevation: 0–3000 m

Distribution

V22 470-distribution-map.jpg

Greenland, St. Pierre and Miquelon, Alta., B.C., Man., Nfld. and Labr., N.B., N.S., N.W.T., Nunavut, Ont., P.E.I., Que., Sask., Yukon, Alaska, Colo., Idaho, Maine, Mass., Mich., Minn., Mont., Nebr., N.H., N.J., N.Y., Oreg., Pa., Utah, Vt., Wash., W.Va., Wis., Wyo., Eurasia, Atlantic Islands (Iceland)

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Juncus filiformis"
84 +, 80 +, 70 +  and 40 +
persistent +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
Ralph E. Brooks* +  and Steven E. Clemants* +
Linnaeus +
channeled;terete +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.21 cm2.1 mm <br />0.0021 m <br />) +
Thread rush +
Greenland +, St. Pierre and Miquelon +, Alta. +, B.C. +, Man. +, Nfld. and Labr. +, N.B. +, N.S. +, N.W.T. +, Nunavut +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, Alaska +, Colo. +, Idaho +, Maine +, Mass. +, Mich. +, Minn. +, Mont. +, Nebr. +, N.H. +, N.J. +, N.Y. +, Oreg. +, Pa. +, Utah +, Vt. +, Wash. +, W.Va. +, Wis. +, Wyo. +, Eurasia +  and Atlantic Islands (Iceland) +
0–3000 m +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
arranged +  and cluster +
Usually sandy, moist or wet soil along stream banks, pools, lakes or in meadow depressions, rarely in bogs, frequently hidden by larger vegetation +
3-10(-12)-flowered +
pseudoaxillary +  and terminal +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
3 +  and 1 +
closely-set +
persistent +
Flowering and fruiting summer. +
parietal +  and axile +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
green;brown or purplish black +
persistent +
Illustrated +
generally longer +
0.2 cm2 mm <br />0.002 m <br /> (?) +
Juncus sect. Genuini +, Juncus sect. Juncotypus +  and Juncus subg. Juncotypus +
Juncus filiformis +
Juncus subg. Genuini +
species +
green +  and light-brown +
lanceolate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.42 cm4.2 mm <br />0.0042 m <br />) +