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Montana Field Guide

Montana Field Guides

Tall Blue Lettuce - Lactuca biennis


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).

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

References
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Citation for data on this website:
Tall Blue Lettuce — Lactuca biennis.  Montana Field Guide.  .  Retrieved on , from