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Montana Field Guide

Montana Field Guides

Tall Blue Lettuce - Lactuca biennis

Native Species

Global Rank: G5
State Rank: SNR

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 3

External Links






 
General Description
Annual or biennial. Stems 60–200 cm. Leaf blades ovate, 10–40 cm long, deeply pinnately lobed; lobes deltoid, dentate, sparsely villous on the margins. Involucre 7–12 mm high; inner phyllaries reflexed in fruit. Rays 15 to 30, blue; ligules 1–5 mm long. Achenes 4–5 mm long; beaks up to 0.5 mm long, stout; pappus tawny (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
AK to NL south to CA, NM, IL and NC (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 8

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Relative Density

Recency

 

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



Habitat
Moist, riparian, forest, thickets; valleys, montane (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Ecology
POLLINATORS
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).

References
  • 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:
Tall Blue Lettuce — Lactuca biennis.  Montana Field Guide.  .  Retrieved on , from