Juncus cooperi

Engelmann

2:590. 1868.

Common names: Cooper's rush
Treatment appears in FNA Volume 22.

Herbs, perennial, robust, tufted, 4–10 dm. Rhizomes short. Culms terete, 1.5–2.5 mm diam. Cataphylls several, reddish-brown, often apiculate. Leaves basal, 1–2; auricles essentially absent; blade terete, 10–40 dcm, shorter than culm. Inflorescences glomerules 3–12, each with (1–) 2–5 flowers, open, branches unequal, 3–12 cm, primary bract terete or slightly compressed, shorter to longer than inflorescence. Flowers: tepals straw-colored to pale green, ovatelanceolate, 4–5 mm, apex acuminate or setaceous; inner series elliptic, nearly equal, margins wide, scarious, apiculate; stamens 6, filaments 1 mm, anthers 1.5–2 mm; style 1 mm. Capsules tan to light reddish-brown, 3-locular, ellipsoid, 3.7–4.5 × 1.6–2 mm, mostly shorter than or nearly equal to perianth. Seeds dark amber, obovoid, body 0.7–1 mm, tails 0.1–0.5 mm.


Phenology: Flowering and fruiting spring–summer.
Habitat: Saline flats and meadows or edges of salt marshes
Elevation: below 600 m

Distribution

V22 167-distribution-map.jpg

Ariz., Calif., Nev., Utah, Mexico

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Juncus cooperi"
persistent +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
setaceous +  and acuminate +
Ralph E. Brooks* +  and Steven E. Clemants* +
Engelmann +
Juncus sect. Juncastrum +  and Juncus subg. Juncastrum +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
unequal +
3 cm30 mm <br />0.03 m <br /> (12 cm120 mm <br />0.12 m <br />) +
tan +  and light reddish-brown +
0.37 cm3.7 mm <br />0.0037 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
ellipsoid +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
reddish-brown +
Cooper's rush +
1.5mm;2.5mm +
Ariz. +, Calif. +, Nev. +, Utah +  and Mexico +
below 600 m +
1 cm10 mm <br />0.01 m <br /> (?) +
arranged +  and cluster +
headlike +
Saline flats and meadows or edges of salt marshes +
few-flowered +
few-to-many +
pseudoaxillary +  and terminal +
compressed +  and terete +
3 +  and 1 +
green;brown or purplish black +
persistent +
Flowering and fruiting spring–summer. +
parietal +  and axile +
dark amber +
obovoid +
green;brown or purplish black +
persistent +
generally longer +
1 cm10 mm <br />0.01 m <br /> (?) +
Juncus sect. Acuti +, Juncus sect. Maritimi +, Juncus sect. Thalassii +  and Juncus subg. Thalassii +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Juncus cooperi +
Juncus subg. Juncus +
species +
straw-colored +  and pale green +
ovatelanceolate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +