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Montana Field Guide

Montana Field Guides

Western Lettuce - Lactuca ludoviciana

Native Species

Global Rank: G4G5
State Rank: SNR

Agency Status
MNPS Threat Rank:
C-value: 3

External Links

General Description
Biennial. Stems 30–150 cm. Leaf blades oblong, 7–30 cm long, pinnately shallowly lobed with a large terminal lobe, prickly below and on the margins, clasping above. Involucre 15–22 mm high; phyllaries reflexed in fruit. Rays 20 to 50, yellow or blue; ligules 5–6 mm long. Achenes 4–5 mm long; beaks 2–5 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
Known from Big Horn and Meagher counties. SK to ON south to CA, AZ, NM, TX, LA and KY (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 15

(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)


The following animal species have been reported as pollinators of this species or genera 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:
Western Lettuce — Lactuca ludoviciana.  Montana Field Guide.  .  Retrieved on , from