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Montana Field Guide

Montana Field Guides

Knotted Rush - Juncus nodosus

Native Species

Global Rank: G5
State Rank: S4

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 5

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General Description
Rhizomatous. Stems erect, terete, 15–50 cm. Leaves basal and cauline; blades terete, septate, 0.5–2 mm wide; auricles rounded, ca. 1 mm long. Inflorescence open with erect to spreading branches and several clusters of 6 to 30 spreading flowers; main bract greater than the inflorescence. Flowers: prophylls absent; tepals green to light brown, 2.5–4 mm long, acuminate; subequal; stamens usually 6. Capsules 4–5 mm long, long-tapered to the beak; seeds apiculate (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


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

Observations in Montana Natural Heritage Program Database
Number of Observations: 34

(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 meadows, wet gravelly soil along streams, ponds, lakes; plains, valleys, rarely montane (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Knotted Rush — Juncus nodosus.  Montana Field Guide.  .  Retrieved on , from