Juncus triglumis var. triglumis
Three-flowered Rush
Taxonomic Status: Provisionally accepted
French Common Names: jonc trois glumes
Unique Identifier: ELEMENT_GLOBAL.2.140172
Element Code: PMJUN012Z2
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: 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.
Concept Reference Code: B00FNA22HQUS
Name Used in Concept Reference: Juncus triglumis var. triglumis
Taxonomic Comments: FNA (vol. 22, 2000) accepts two varieties of Juncus triglumis: var. triglumis and var. albescens. Kartesz (1999) treats these as distinct species, however, does not include reports of J. triglumis (sens strict) in Colorado, Montana, and Wyoming while FNA does report J. triglumis var. triglumis in these states. Thus it seems that the concepts of J. triglumis of Kartesz (1999) and J. triglumis var. triglumis of FNA (2000) are different.
Conservation Status
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NatureServe Status

Global Status: G5T5
Global Status Last Reviewed: 05Aug1991
Global Status Last Changed: 05Aug1991
Rounded Global Status: T5 - Secure
Nation: United States
National Status: NNR
Nation: Canada
National Status: NNR (04Feb2014)

U.S. & Canada State/Province Status
United States Montana (SU), Wyoming (S1)
Canada Nunavut (SNR), Yukon Territory (S1S2)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Circumboreal, in North America extending from Alaska and northern Canada south in the Rocky Mountains to Colorado.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Circumboreal, in North America extending from Alaska and northern Canada south in the Rocky Mountains to Colorado.

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

U.S. & Canada State/Province Distribution
United States MT, WY
Canada NU, 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, or divided internally into sections. 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 dark brown perianth segments, or 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, and J. BIGLUMIS has only 2 flowers and capsules that are indented on top. In VAR ALBESCENS, the bracts are as long as the flower head, and the mature capsules are 3-5 mm long, ca. as long as the light brown tepals. JUNCUS is a large and difficult genus to distinguish, so a technical key should be consulted. Mature fruit is necessary for positive determination.
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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  • Andersen, M.D. and B. Heidel. 2011. HUC-based species range maps. Prepared by Wyoming Natural Diversity Database for use in the pilot WISDOM application operational from inception to yet-to-be-determined date of update of tool.

  • Brooks, R. E. and S. E. Clemants. 2000. Juncus. Pages 211-255 in Flora of North America Editorial Committee, editor. Flora of North America North of Mexico. Vol. 22 Magnoliophyta: Alismatidae, Arecidae, Commelinidae (in part), and Zingiberidae. Oxford University Press, New York, NY.

  • Cronquist, A., A. H. Holmgren, N. H. Holmgren, J. L. Reveal, and P. K. Holmgren. 1977. Intermountain Flora; Vascular Plants of the Intermountain West, U.S.A. Volume 6: The Monocotyledons. Columbia University Press, New York, NY.

  • Dorn, R. D. 1977. Manual of the Vascular Plants of Wyoming. 2 volumes. Garland Publishing, Inc., New York, NY.

  • Dorn, R. D. 1988. Vascular Plants of Wyoming. Mountain West Publishing, Cheyenne, WY.

  • Dorn, R. D. 1992. Vascular Plants of Wyoming, second edition. Mountain West Publishing, Cheyenne, WY.

  • Dorn, R. D. 2001. Vascular Plants of Wyoming, third edition. Mountain West Publishing, Cheyenne, WY.

  • ERO Resources Corporation. 1999. Final Report: Plant species of concern, portions of US 212 (FH 4), the Beartooth Highway, Park County, Wyoming. Prepared for the Federal Highway Administration by ERO Resources Corp., Denver, CO.

  • ERO Resources Corporation. 2000. Final report: plant species of concern - portions of U.S. 212 (FH 4). The Beartooth Highway. Park County, Wyoming and Park County, Montana. Unpublished report prepared for the Federal Highway Administration by the ERO Resources Corporation, Denver, CO.

  • Evert, E. F. 2010. Vascular Plants of the Greater Yellowstone Area: Annotated Catalog and Atlas. Park Ridge, IL.

  • Fertig, W. 1999. State Species Abstract: Juncus triglumis var. triglumis. Wyoming Natural Diversity Database. Available on the internet at www.uwyo.edu/wyndd.

  • Fertig, W. 1998. The status of rare plants on Shoshone National Forest: 1995-97 survey results. Unpublished report prepared for the Shoshone National Forest by the Wyoming Natural Diversity Database, Laramie, WY.

  • Fertig, W. 1999. The status of rare plants in the Bighorn Landscape. Report prepared for The Nature Conservancy Wyoming Field Office by the Wyoming Natural Diversity Database, Laramie, Wyoming.

  • Fertig, W. and M. Bynum. 1994. Biological report on the Proposed Twin Lakes Research Natural Area. Unpublished report prepared for the Shoshone National Forest by the Wyoming Natural Diversity Database, Laramie, WY.

  • 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. and W. A. Weber. 1977. Juncus triglumis in North America. Rhodora 79:160-162.

  • Hitchcock, C. L., A. Cronquist and M. Ownbey. 1969. Vascular Plants of the Pacific Northwest, Part 1: Vascular Cryptograms, Gymnosperms and Monocotyledons. University of Washington Press, Seattle, WA.

  • Hulten, E. 1968. Flora of Alaska and Neighboring Territories. Stanford University Press. Palo Alto, CA. 1008 pp.

  • Hurd, E. G., S. Goodrich, and N. L. Shaw. 1997. Field Guide to Intermountain Rushes. USDA Forest Service, Intermountain Research Station, UT.

  • Lesica, P. & J. S. Shelly. 1991. Sensitive, Threatened and Endangered Vascular Plants of Montana. Montana Natural Heritage Program, Occ. Publ. No. 1. Helena, MT.

  • 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.

  • Lesica, P. 1993g. 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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