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Montana Field Guide

Montana Field Guides

White Water Buttercup - Ranunculus aquatilis
Other Names:  Ranunculus longirostris, Ranunculus subrigidus, Ranunculus circinatus, Ranunculus trichophyllus

Native Species

Global Rank: G5
State Rank: S4

Agency Status
MNPS Threat Rank:
C-value: 4

External Links

General Description
Plants aquatic. Stems floating with glabrous to sparsely hairy foliage. Leaf blades 10–30 mm long, reniform, twice divided into numerous thread-like segments. Flowers solitary at leaf nodes; petals white, 4–9 mm long, twice as long as the glabrous, deciduous sepals. Achenes glabrous or sparsely hairy, cross-corrugate, 1–2 mm long with a straight beak ca. 0.5 mm long; heads hemispheric, 3–5 mm high (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range


Range Comments
Circumboreal south to most of North America (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 2483

(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)

Shallow water of ponds, lakes, streams at all elevations (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

  • Literature Cited AboveLegend:   View Online Publication
    • Hitchcock, C. L., A. Cronquist, M. Ownbey, and J. W. Thompson. 1964. Vascular Plants of the Pacific Northwest. Part 2: Salicaceae to Saxifragaceae. University of Washington Press, Seattle. 597 pp.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
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Citation for data on this website:
White Water Buttercup — Ranunculus aquatilis.  Montana Field Guide.  .  Retrieved on , from