Page authors: Don Knoke, David Giblin
Mycelis muralis
wall lettuce

Distribution: Occurring on both sides of the Cascades crest in Washington, but more common west of the crest; British Columbia to Oregon; also in eastern North America.

Habitat: Roadsides, fields, wastelots, and other disturbed, open areas from the lowlands to middle elevations in the mountains.

Flowers: July-September

Origin: Introduced from Europe

Growth Duration: Annual

Conservation Status: Not of concern


Slender, glabrous annual or biennial, 3-9 dm. tall, with milky juice.


Basal and lower cauline leaves 6-18 cm. long and 3-8 cm. wide, pinnatifid, with a broad terminal segment, the lower surface glaucous; middle and upper leaves few and much reduced.


Heads several to numerous, in an open panicle; involucre with a set of small bracts around the base, 9-11 mm. high in fruit, narrow; corollas all ligulate, yellow, only 5 in a head; pappus of white capillary bristles;


Achenes compressed, 4 mm. long including the 1 mm.-long beak, with several prominent veins on each face.

Accepted Name:
Mycelis muralis (L.) Dumort.
Publication: Fl. Belg. 60. 1827.

Synonyms & Misapplications:
Lactuca muralis (L.) Gaertn. [HC]
Additional Resources:

PNW Herbaria: Specimen records of Mycelis muralis in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Mycelis muralis checklist entry.

E-Flora BC: Mycelis muralis atlas page.

CalPhotos: Mycelis muralis photos.

USDA Plants: Mycelis muralis information.

22 photographs:
Group by