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Montana Field Guide

Montana Field Guides

Western Dock - Rumex occidentalis
Other Names:  Rumex aquaticus var. fenestratus

Native Species

Global Rank: G5T5
State Rank: SNR
C-value: 4

Agency Status


External Links

General Description
Mostly glabrous perennial. Stems erect, simple, 50–120 cm, >6 mm wide. Leaf blades 5–25 cm long, lanceolate with a truncate to cordate base and wavy margins. Inflorescence 15–40 cm long, a leafy-bracted panicle of ascending branches. Flowers perfect; outer tepals 2–3 mm long. Fruit 5–10 mm long; inner tepals ovate without a callosity. Achenes reddish brown, 3–5 mm long (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range Range Descriptions


Range Comments
AK to QC south to CA, NV, NM and SD (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 28

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



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


  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Culver, D.R. 1994. Floristic analysis of the Centennial Region, Montana. M.Sc. Thesis. Montana State University, Bozeman. 199 pp.
    • Jones, W. W. 1901. Preliminary flora of Gallatin County. M.S. Thesis. Bozeman, MT: Montana State College. 78 pp.
    • Meier, G.A. 1997. The colonization of Montana roadsides by native and exotic plants. M.Sc. Thesis. Bozeman, MT: Montana State University. 45 p.
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Citation for data on this website:
Western Dock — Rumex occidentalis.  Montana Field Guide.  .  Retrieved on , from