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Montana Field Guide

Montana Field Guides

Vasey's Rush - Juncus vaseyi

Undetermined Origin

Global Rank: G5
State Rank: SU
(see State Rank Reason below)

Agency Status


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State Rank Reason (see State Rank above)
Juncus vaseyi is reported for Montana, but specimens have not been verified or located. The Flora of North America reports that this species is present in Montana, but despite efforts the specimens have not been found. It has been collected in Teton and Meagher Counties, but these specimens need to be verified. Two specimens collected in Cascade County were later verified to be Juncus hallii and Juncus drummondii. Until specimens can be obtained and verified this species remains unrankable.
General Description
Short-rhizomatous, caespitose. Stems erect, terete, 20–100 cm. Leaves basal; blades terete, 1 mm or less wide; auricles scarious, whitish, minute. Inflorescence open to congested with 5 to 20 pedicellate flowers; bract shorter or greater than the inflorescence. Flowers with prophylls; tepals green to tan, 3.5–4.5 mm long, subequal with acuminate tips; stamens 6. Capsules 4–5 mm long, rounded on top; seeds short-appendaged (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
NT to NL south to ID, CO, IA and NY. According to Lesica (2012) there is a report in Flora of North America for northwest MT, and a report for Cascade County by Dorn (1984) was based on a misidentified specimen of J. hallii (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 4

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

  • Literature Cited AboveLegend:   View Online Publication
    • Douglas, G.W., D. Meidinger, and J. Pojar, editors. 2001. The Illustrated Flora of British Columbia. Volume 6. Monocotyledons (Acoraceae through Najadaceae). British Columbia Ministry of Environment, Lands and Parks and British Columbia Ministry of Forests, Victoria.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • McGregor, R.L. (coordinator), T.M. Barkley, R.E. Brooks, and E.K. Schofield (eds). 1986. Flora of the Great Plains: Great Plains Flora Association. Lawrence, KS: Univ. Press Kansas. 1392 pp.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Britton, N. L. and A. B. Brown. 1913. An Illustrated Flora of the Northern United States, Canada, and the British Possessions. 2nd Edition in 3 Volumes. New York, NY: Charles Scribner's Sons. B13BRI01PAUS.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
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Citation for data on this website:
Vasey's Rush — Juncus vaseyi.  Montana Field Guide.  .  Retrieved on , from