Juncus triformis

Engelmann

2:492. 1868.

Common names: Long-styled dwarf rush
IllustratedEndemicConservation concern
Synonyms: Juncus megaspermus F. J. Hermann Juncus triformis var. stylosus Engelmann
Treatment appears in FNA Volume 22.

Herbs, annual, cespitose, 0.5–1.5 dm. Culms 2–80, capillary, 0.1–4 mm diam. Leaves 1/5–1/3 height of plant. Inflorescences headlike clusters, each with 1–7 flowers, bracts subtending inflorescence 2–10, ovate to broadly lanceolate, inconspicuous, 0.7–2.4 mm, membranous, apex acute. Flowers: tepals reddish with green central band, linear to lanceolate, 1.9–4.5 × 0.5–1.1 mm; inner series slightly longer than outer, apex acuminate to attenuate; stamens 3, filaments 0.4–1.1 mm, anthers 1–2.2 mm; style persistent, 1–3.2 mm, stigma 0.5–2.5 mm. Capsules reddish, 3-locular, ovoid to ellipsoid or oblate, 1.6–2.5 × 1.1–1.8 mm, usually 1/2 length of tepals. Seeds nearly globose to ellipsoid, 0.3–0.7 mm. n = 18.


Phenology: Flowering and fruiting spring–mid summer.
Habitat: Shallow soil of seepage areas on granite outcrops, such as along stream banks, ditches, around springs
Elevation: 0–2500 m

Discussion

Of conservation concern.

Selected References

None.

Lower Taxa

None.

No values specified.

... more about "Juncus triformis"
persistent +
0.1 cm1 mm <br />0.001 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
acuminate +  and attenuate +
Ralph E. Brooks* +  and Steven E. Clemants* +
Engelmann +
channeled;terete;flat +
inconspicuous +
ovate +  and broadly lanceolate +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.24 cm2.4 mm <br />0.0024 m <br />) +
membranous +
ovoid;ellipsoid or oblate +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
Long-styled dwarf rush +
0.1mm;4mm +
capillary +
0–2500 m +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
arranged +  and cluster +
headlike +
Shallow soil of seepage areas on granite outcrops, such as along stream banks, ditches, around springs +
pseudoaxillary +  and terminal +
1/5 height of plant;1/3 height of plant +
cauline +  and basal +
3 +  and 1 +
green;brown or purplish black +
persistent +
Flowering and fruiting spring–mid summer. +
parietal +  and axile +
Abhandlungen herausgegeben vom naturwissenschaftlichen Vereine zu Bremen +
nearly globose;ellipsoid +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
green;brown or purplish black +
persistent +
Illustrated +, Endemic +  and Conservation concern +
generally longer +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
persistent +
0.1 cm1 mm <br />0.001 m <br /> (?) +  and 0.32 cm3.2 mm <br />0.0032 m <br /> (?) +
Juncus megaspermus +  and Juncus triformis var. stylosus +
Juncus triformis +
Juncus subg. Graminifolii +
species +
1.9mm;4.5mm +
linear +  and lanceolate +
0.5mm;1.1mm +
herb +  and cespitose +