Juncus brevicaudatus

(Engelmann) Fernald

Rhodora 6: 35. 1904

Common names: Narrow-panicled rush
Basionyms: Juncus canadensis var. brevicaudatus Engelmann Trans. Acad. Sci. St. Louis 2: 436. 1866
Synonyms: Juncus canadensis var. coarctatus Engelmann Juncus canadensis var. kuntzei Buchenau Juncus coarctatus Rydberg Juncus kuntzei Juncus tweedyi
Treatment appears in FNA Volume 22.
Herbs, perennial, cespitose, 1.4–5.5(–7) dm. Culms erect, terete, 1–3 mm diam., smooth. Cataphylls 0–1, straw-colored to pink, apex acute. Leaves: basal 1–3, cauline 1–2; auricles 0.5–3 mm, apex rounded to truncate, scarious; blade terete, 1.5–25 cm × 0.5–2.5 mm. Inflorescences terminal panicles or racemes of 2–35 heads, 1–12 cm, branches erect; primary bract erect; heads 2–8-flowered, ellipsoid to narrowly obconic, 2–9 mm diam. Flowers: tepals green to light brown, lanceolate; outer tepals 2.3–3.1 mm, apex acuminate to rarely obtuse; inner tepals 2.5–3.2 mm, apex acuminate; stamens 3 (or 6), anthers 1/4–1/2 filament length. Capsules exserted, chestnut brown, imperfectly 3-locular, narrowly ellipsoid to prismatic, 3.2–4.8 mm, apex acute proximal to beak, valves separating at dehiscence. Seeds fusiform, 0.7–1.2 mm, tailed; body covered with whitish translucent veil. 2n = 80.

Phenology: Fruiting mid summer–fall.
Habitat: Generally in acidic or peaty moist sites, including emergent shorelines and aroundg hot springs
Elevation: 100–2500 m


V22 274-distribution-map.jpg

Alta., B.C., Man., N.B., Nfld. and Labr., N.S., Ont., P.E.I., Que., Sask., Ariz., Colo., Conn., Maine, Md., Mass., Mich., Minn., Mont., N.H., N.Y., N.C., Oreg., Pa., R.I., Tenn., Utah, Vt., Va., W.Va., Wis., Wyo.


Populations from about around hot springs in the west have been separated as Juncus tweedyi Rydberg, but no morphologic distinction appears to exist between J. tweedyi and J. brevicaudatus.

Selected References


Lower Taxa


Facts about "Juncus brevicaudatus"
AuthorRalph E. Brooks* + and Steven E. Clemants* +
Authority(Engelmann) Fernald +
BasionymsJuncus canadensis var. brevicaudatus +
Common nameNarrow-panicled rush +
DistributionAlta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Ariz. +, Colo. +, Conn. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mont. +, N.H. +, N.Y. +, N.C. +, Oreg. +, Pa. +, R.I. +, Tenn. +, Utah +, Vt. +, Va. +, W.Va. +, Wis. + and Wyo. +
Elevation100–2500 m +
HabitatGenerally in acidic or peaty moist sites, including emergent shorelines and aroundg hot springs +
IllustrationPresent +
Illustration copyrightFlora of North America Association +
IllustratorYevonn Wilson-Ramsey +
PhenologyFruiting mid summer–fall. +
Publication titleRhodora +
Publication year1904 +
ReferenceNone +
Source xmlhttps://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse grained fna xml/V22/V22 274.xml +
SynonymsJuncus canadensis var. coarctatus +, Juncus canadensis var. kuntzei +, Juncus coarctatus +, Juncus kuntzei + and Juncus tweedyi +
Taxon familyJuncaceae +
Taxon nameJuncus brevicaudatus +
Taxon parentJuncus subg. Septati +
Taxon rankspecies +
VolumeVolume 22 +