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Montana Field Guide

Montana Field Guides

Mertens' Rush - Juncus mertensianus


Global Rank: G5
State Rank: S4

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 7

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General Description
Rhizomatous. Stems erect, terete, 5–35 cm, sometimes tufted. Leaves basal and cauline; blades terete, 1–2 mm wide; auricles acute to rounded, ca. 1 mm long. Inflorescence capitate with 1 cluster of 6 to 60 flowers, 8–15 mm across; main bract usually greater than the inflorescence. Flowers: prophylls absent; tepals purple to black, 3–5 mm long, acuminate; inner slightly shorter and broader; stamens 6. Capsules 2–4 mm long, rounded on top; seeds without appendages (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
AK to SK south to CA, AZ and NM (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 19

(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
Wet soil along streams, lakes, seeps; subalpine to alpine, rarely lower (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Mertens' Rush — Juncus mertensianus.  Montana Field Guide.  .  Retrieved on , from