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Montana Field Guide

Montana Field Guides

Coville's Rush - Juncus covillei

Species of Concern

Global Rank: G5
State Rank: S2S3
* (see State Rank Reason below)

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 4

External Links






State Rank Reason (see State Rank above)
Rare and peripheral in Montana. Currently known from approximately a half-dozen widely scattered wetland/riparian sites in the mountainous portion of the state.
 
General Description
Rhizomatous. Stems erect, compressed, 6–20 cm, sometimes clumped. Leaves basal and cauline; blades flat, 1–2 mm wide; auricles acute or absent. Inflorescence congested with 3 to 7 sessile flowers in each of 1 to 3 clusters; main bract shorter or longer than the inflorescence. Flowers: prophylls absent; tepals brown to purplish with a green midstripe, 3–4 mm long, acute; stamens 6. Capsules 3–5 mm long, truncate on top; seeds without appendages (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).



We have varieties covillei and obtusatus C.L. Hitchc.

Phenology
Fruits reach maturity from late August-September

Diagnostic Characteristics
Juncus is a large and difficult genus to distinguish, so a technical key should be consulted. Mature fruit is necessary for positive determination. The combination of flowers subtended by a single bract, flattened leaves, and 7-flowered heads separate J. covillei from most other rhizomatous rushes. The tepals of var obtusatus are pale brown, and the inner ones have pointed tips. In contrast, the tepals of variety covillei are dark brown, and the inner tepals have rounded tips.

Species Range
Present
 


Range Comments
BC to CA, ID and MT (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 9

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

Recency

 

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



Habitat
Variety covillei is typically found in moist, gravelly or sandy soil along major water courses in the valley zone. In contrast, variety obtusatus is found in moist to wet, often seepy soil of slopes and meadows in the montane and subalpine zones.

Ecological Systems Associated with this Species

References
  • Additional ReferencesLegend:   View Online Publication
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    • Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Vanderhorst, J.P. 1994. Sensitive plant surveys in the Gallatin National Forest, Montana. Unpublished report to the Gallatin National Forest. Montana Natural Heritage Program, Helena, MT. 54 pp.
    • Vanderhorst, J.P. 1994. Survey for sensitive plant species on Doherty Mountain, Jefferson County. Unpublished report to the Butte District, Bureau of Land Management. Montana Natural Heritage Program, Helena, MT. 5 pp. plus appendices.
  • Web Search Engines for Articles on "Coville's Rush"
  • Additional Sources of Information Related to "Monocots"
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Citation for data on this website:
Coville's Rush — Juncus covillei.  Montana Field Guide.  .  Retrieved on , from