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Montana Field Guide

Montana Field Guides

Water Horsetail - Equisetum fluviatile


Global Rank: G5
State Rank: S4

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 6

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General Description
Stems annual, monomorphic, hollow, branched or not, with 9 to 25 ridges, up to 1 m long, 2–8 mm wide. Sheaths green with black teeth. Branches with first internode shorter than subtending stem sheath. Strobili blunt, 5–30 mm long, maturing in summer.Unbranched plants resemble Equisetum laevigatum but the sheath teeth are not broken off (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
Northwestern MT; circumboreal, to WA, IL and PA (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).>

Summary of Observations Submitted for Montana
Number of Observations: 71

(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
Shallow water of ponds, lakes, sloughs, marshes, fens; plains, 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:
Water Horsetail — Equisetum fluviatile.  Montana Field Guide.  .  Retrieved on , from