Page author: Don Knoke
Lactuca canadensis
Canadian wild lettuce, Florida blue lettuce
WTU specimens
Other herbaria

Distribution: Widespread in eastern United States; occasionally introduced in the Pacific Northwest.

Habitat: Fields, woodlands and waste places.

Flowers: July - September

Origin: Introduced from eastern North America

Conservation Status: Not of concern

Description:
General:

Annual or biennial, 3-25 dm. tall, usually glabrous and often glaucous, the juice milky.

Leaves:

Basal and lower cauline leaves 10-35 cm. long and 1.5-12 cm. wide, entire to pinnately lobed.

Flowers:

Heads numerous, 13-22 flowered, the flowers yellow, all ligulate; involucre 10-15 mm. high, cylindric but broadening at the base, the bracts imbricate; pappus bristles 5-7 mm. long, white.

Fruits:

Achenes blackish, very flat, with a median nerve on each face, 4.5-6.5 mm. long including the slender beak, which may be as long as the body.

Accepted Name:
Lactuca canadensis L.
Publication: Sp. Pl. 2: 796. 1753. 1753.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Lactuca canadensis in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Lactuca canadensis checklist entry.

E-Flora BC: Lactuca canadensis atlas page.

CalPhotos: Lactuca canadensis photos.

USDA Plants: Lactuca canadensis information.

2 photographs:
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