Tall Blue Lettuce - Lactuca biennis
MNPS Threat Rank
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)
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:
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(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
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- Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.