E-Flora BC: Electronic Atlas of the Flora of British Columbia

Mycelis muralis (L.) Dumort.
wall lettuce
Asteraceae (Aster family)

Introduction to Vascular Plants

© Bryan Kelly-McArthur  Email the photographer   (Photo ID #74369)

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Distribution of Mycelis muralis
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Species Information

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Annual or biennial herb from a fibrous root; stems erect, branched above, solitary or more usually several, glabrous, often glaucous, exuding milky juice when broken, 30-90 cm tall.
Basal leaves lacking; stem leaves alternate; basal and lower leaves 6-18 cm long, 3-8 cm wide, pinnately cut with a broad, ivylike terminal segment, the bases with earlike and clasping flanges, glabrous, middle and upper leaves few and reduced.
Heads with strap-shaped flowers, numerous in a rounded inflorescence; involucres 9-11 mm tall; involucral bracts in 2 series, the outer lanceolate, the inner much reduced, linear, glabrous or nearly so; ray flowers yellow, 5.
Achenes several-nerved, approximately 4 mm long including the 1 mm long beak; pappus white.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist to mesic forests in the lowland and montane zones; common in S BC, also in Queen Charlotte Islands; introduced from Europe.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Mycelis muralis

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class




Elevation (metres) 0 304 1195
Slope Gradient (%) 0 19 130
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 235 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 4 8
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: CDF(132), CWH(712), ICH(15), IDF(41), MH(6), PP(1), SBS(1)

Ecological Indicator Information

A shade-tolerant/intolerant, submontane to montane, European forb introduced to Pacific, Cordilleran, and Atlantic North America. Occurs in maritime to submaritime cool mesothermal climates on fresh to moist, nitrogen-rich soils; its occurrence decreases with increasing elevation and continentality. Frequent in semi-open, seral forests on disturbed water-shedding and water-receiving sites; common, occasionally dominant, in early-seral communities on cutover and burnt site (often inhabits exposed mineral soil). Often grows with Achlys triphylla, Epilobium angustifolium, Kindbergia oregana, Polystichum munitum, and Tiarella trifoliata. A nitrophytic species characteristic of Moder and Mull humus forms.

SourceIndicator Plants of Coastal British Columbia (Information applies to coastal locations only)


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is cool mesothermal.

Synonyms and Alternate Names

Lactuca muralis (L.) Fresen.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References