Juncus triglumis - L.
Three-flower Rush
Other Common Names: three-hulled rush
Synonym(s): Juncus triglumis ssp. triglumis
Taxonomic Status: Accepted
Related ITIS Name(s): Juncus triglumis L. (TSN 39239)
Unique Identifier: ELEMENT_GLOBAL.2.160231
Element Code: PMJUN012Z0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Rush Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Monocotyledoneae Juncales Juncaceae Juncus
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Concept Reference
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Concept Reference: Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Concept Reference Code: B94KAR01HQUS
Name Used in Concept Reference: Juncus triglumis
Conservation Status
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NatureServe Status

Global Status: G5
Global Status Last Reviewed: 13May2016
Global Status Last Changed: 29Sep1987
Ranking Methodology Used: Ranked by inspection
Rounded Global Status: G5 - Secure
Nation: United States
National Status: NNR
Nation: Canada
National Status: N5 (01Jun2011)

U.S. & Canada State/Province Status
United States Alaska (SNR), Montana (SNR), Wyoming (S2)
Canada British Columbia (S4), Labrador (SNR), Newfoundland Island (SNR), Northwest Territories (SNR), Nunavut (SNR), Ontario (S4S5), Quebec (SNR), Yukon Territory (S5)

Other Statuses

NatureServe Global Conservation Status Factors

Other NatureServe Conservation Status Information

Distribution
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U.S. States and Canadian Provinces
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States AK, MT, WY
Canada BC, LB, NF, NT, NU, ON, QC, YT

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
WY Johnson (56019), Park (56029)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
10 Clarks Fork Yellowstone (10070006)+, Nowood (10080008)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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General Description: Three-flowered Rush is a small, tufted, grass-like perennial with stems that are 4-8 cm high. The basal leaves are 1-6 cm long, round in cross-section, and septate. Stem leaves are lacking. 2-4 flowers are borne in a solitary, terminal cluster, subtended by 2 brown, papery bracts that are as long as the head. Each flower is subtended by a single scale-like bract and has 6 tepals that are ca. 4 mm long with rounded tips. There are 6 stamens. The brown capsule is 5-7 mm high, rounded on top with a short beak, and exserted beyond the tepals. Each seed is 2-3 mm long with a narrow, papery wing on each end.
Diagnostic Characteristics: Of the small, high alpine rushes, JUNCUS CASTANEUS has larger flowers, J. BIGLUMIS has only 2 flowers and capsules that are indented on top, and J. ALBESCENS has bracts that are as long as the flower head, and mature capsules that are 3-5 mm long; ca. as long as the light brown tepals. A hand lens or microscope and technical key are needed for positive identification.
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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Element Ecology & Life History Edition Date: 31Oct1994
Element Ecology & Life History Author(s): JM

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
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  • Cody, W.J. 1996. The flora of the Yukon Territory. National Research Council of Canada Research Press, Ottawa, Canada. 643 pp.

  • Fertig, W. and M. Bynum. 1994. Biological report on the proposed Twin Lakes Research Natural Area. Unpublished report to the Shoshone National Forest. Wyoming Natural Diversity Database, Laramie, Wyoming. 33 pp. plus appendices.

  • Flora of North America Editorial Committee. 2000. Flora of North America north of Mexico. Vol. 22. Magnoliophyta: Alismatidae, Arecidae, Commelinidae (in part), and Zingiberidae. Oxford Univ. Press, New York. xxiii + 352 pp.

  • Hermann, F. J. 1975. Manual of the rushes (JUNCUS SPP.) of the Rocky Mountains and Colorado Basin. U. S. For. Serv., Gen. Tech. RM-18.

  • Hermann, F. J. and W. A. Weber. 1977. JUNCUS TRIGLUMIS in North America. Rhodora 79:160-162.

  • Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

  • Lesica, P. 1993. Vegetation and flora of the Line Creek Plateau area, Carbon County, Montana. Unpublished report to USDA Forest Service, Intermountain Research Station. Montana Natural Heritage Program, Helena, Montana. 30 pp.

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