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Montana Field Guide

Montana Field Guides

Dwarf Scouring-rush - Equisetum scirpoides


Global Rank: G5
State Rank: S3
* (see State Rank Reason below)

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

External Links






State Rank Reason (see State Rank above)
13 collections at MONTU from western Montana.
 
General Description
Stems monomorphic, dark green, evergreen, solid, 5–15 cm × up to 1 mm, prostrate or ascending, twisted, mostly unbranched or branched at the base, with 6 ridges. Sheaths green below, dark above; the teeth hyaline with dark centers and a bristle tip. Strobili 5 mm or less long, sharp-pointed (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
In MT in several mountainous western counties; circumboreal to WA, UT, IL, and NY (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 83

(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
Damp, often calcareous soil of spruce forests; valleys to montane. (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Dwarf Scouring-rush — Equisetum scirpoides.  Montana Field Guide.  .  Retrieved on , from