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Montana Field Guide

Montana Field Guides

Canada Lettuce - Lactuca canadensis

Undetermined Origin

Global Rank: G5
State Rank: SNR

Agency Status
MNPS Threat Rank:

External Links

General Description
Annual or biennial. Stems erect, simple below, 30–200 cm. Leaf blades lanceolate, 10–35 cm long, sometimes pilose on the midvein below, deeply pinnately divided into lanceolate lobes. Involucre 10–15 mm high; phyllaries reflexed in fruit. Rays 15 to 20; ligules blue to yellow, ca. 4 mm long. Achenes 5–6 mm long; beaks 1–3 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Known from Park County. Throughout North America (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 16

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Relative Density



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


The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus vagans, Bombus fervidus, Bombus rufocinctus, Bombus terricola, Bombus griseocollis, and Bombus impatiens (Colla and Dumesh 2010).

  • Literature Cited AboveLegend:   View Online Publication
    • Colla, S.R. and S. Dumesh. 2010. The bumble bees of southern Ontario: notes on natural history and distribution. Journal of the Entomological Society of Ontario 141: 39-68.
  • 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:
Canada Lettuce — Lactuca canadensis.  Montana Field Guide.  .  Retrieved on , from