Page authors: Don Knoke, David Giblin
Lactuca serriola
prickly lettuce
WTU specimens
Other herbaria

Distribution: Occurring on both sides of the Cascades in Washington; common and widespread throughout much of North America.

Habitat: Fields and waste places.

Flowers: July-September

Origin: Introduced from Europe

Conservation Status: Not of concern

Description:
General:

Winter annual or biennial, 3-15 dm. tall, glabrous, with milky juice.

Leaves:

Leaves prickly on the midrib beneath and on the margins, pinnately lobed (or entire in one variety), twisted at the base to lie in a vertical plane, sagittate-clasping, 5-30 cm. long and 1-10 cm. wide.

Flowers:

Heads numerous, 13-27 flowered, the flowers yellow, all ligulate; involucre 10-15 mm. high, cylindric but broadening at the base, the bracts imbricate; pappus of white capillary bristles.

Fruits:

Achenes gray or yellowish, the body 3-4 mm. long and a third as wide, compressed, prominently several-nerved on each face, with fine spines above, the beak as long to twice as long as the body.

Accepted Name:
Lactuca serriola L.
Publication: Cent. Pl. II. 29. 1756. 1756.

Synonyms & Misapplications:
Lactuca scariola L. var. integrata Gren. & Godr.
Lactuca scariola L. var. scariola
Additional Resources:

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

WA Flora Checklist: Lactuca serriola checklist entry.

E-Flora BC: Lactuca serriola atlas page.

CalPhotos: Lactuca serriola photos.

USDA Plants: Lactuca serriola information.

48 photographs:
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