Difference between revisions of "Juncus xiphioides"

E. Meyer

Synopsis Juncorum 50. 1822.

Synonyms: Juncus xiphioides var. auratus Engelmann Juncus xiphioides var. littoralis Engelmann
Treatment appears in FNA Volume 22.
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|elevation=500–1600 m
 
|elevation=500–1600 m
 
|distribution=Ariz.;Calif.;Nev.;N.Mex.;Utah;Mexico (Baja California).
 
|distribution=Ariz.;Calif.;Nev.;N.Mex.;Utah;Mexico (Baja California).
|discussion=<p>This species and the next (<i>Juncus ensifolius</i>) are closely related and have been treated as members of a single species (<i>J. xiphioides</i>) by Engelmann. Until a study of the complete subgenus is done, I amwe are hesitant to use a varietal name (<i>J. xiphioides</i> var. triandrus) for the widespread western taxon <i>J. ensifolius</i>.</p>
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|discussion=<p>This species and the next (<i>Juncus ensifolius</i>) are closely related and have been treated as members of a single species (<i>J. xiphioides</i>) by Engelmann. Until a study of the complete subgenus is done, we are hesitant to use a varietal name (<i>J. xiphioides</i> var. <i>triandrus</i>) for the widespread western taxon <i>J. ensifolius</i>.</p>
 
|tables=
 
|tables=
 
|references=
 
|references=

Revision as of 12:58, 14 July 2020

Herbs, perennial, rhizomatous, 5–9 dm. Rhizomes 2–3 mm diam. Culms erect, 2–6 mm diam. Cataphylls 0 or 1–2, straw-colored, apex narrowly acute. Leaves: basal 1–3, cauline 2–6, straw-colored; auricles absent; blade 10–40 cm x (3–)7–12 mm. Inflorescences panicles or racemes of 20–50 heads, 2–14 cm, erect or ascending branches; primary bract erect; heads 15–70-flowered, obovoid to globose, 7–11 mm diam. Flowers: tepals green to brown or reddish brown, lanceolate, 2.4–3.7 mm, nearly equal, apex acuminate; stamens 6; anthers ½1/2 to equal filament length. Capsules slightly exserted, chestnut to dark brown, 1-locular, ellipsoid, 2.4–3.8 mm, apex acuminate, not beaked. Seeds elliptic to obovate, 0.4–0.6 mm, not tailed. 2n = 40.


Phenology: Fruiting early summer–fall.
Habitat: Salt marshes, moist areas, ditches, springs, lake and stream shores
Elevation: 500–1600 m

Distribution

V22 247-distribution-map.jpg

Ariz., Calif., Nev., N.Mex., Utah, Mexico (Baja California).

Discussion

This species and the next (Juncus ensifolius) are closely related and have been treated as members of a single species (J. xiphioides) by Engelmann. Until a study of the complete subgenus is done, we are hesitant to use a varietal name (J. xiphioides var. triandrus) for the widespread western taxon J. ensifolius.

Selected References

None.

Lower Taxa

None.
... more about "Juncus xiphioides"
Ralph E. Brooks* +  and Steven E. Clemants* +
E. Meyer +
Juncus sect. Ensifolii +
Ariz. +, Calif. +, Nev. +, N.Mex. +, Utah +  and Mexico (Baja California). +
500–1600 m +
Salt marshes, moist areas, ditches, springs, lake and stream shores +
Fruiting early summer–fall. +
Synopsis Juncorum +
Juncus xiphioides var. auratus +  and Juncus xiphioides var. littoralis +
Juncus xiphioides +
Juncus subg. Ensifolii +
species +