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

Packera subnuda var. moresbiensis (de Candolle) Trock & T. M. Barkley (Calder & Roy L. Taylor) Trock
Queen Charlotte butterweed
Asteraceae (Aster family)

Introduction to Vascular Plants

© Hans Roemer  Email the photographer   (Photo ID #10697)

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Distribution of Packera subnuda var. moresbiensis
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Species Information

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Perennial herb from a fibrous-rooted, stout woody stem-base or short rhizome; stems erect, solitary, simple or rarely few branched, glabrous, 15-35 cm tall.
Basal leaves egg-shaped, stalked, 1.5-6 cm long including the stalk, 0.5-2.3 cm wide, regularly toothed, glabrous, usually purplish; lower stem leaves similar, few; upper stem leaves becoming more lanceolate and unstalked upwards, often purplish, conspicuously white-woolly tufted in the leaf axils, uppermost reduced to entire, purplish-tipped bracts.
Heads with ray and disk flowers, solitary or rarely 1-2 heads on white woolly-hairy stalks, some hairs often with prominent reddish crosswalls; involucres 7-11 mm tall; involucral bracts linear-lanceolate, purplish-tinged throughout, long soft-hairy below, rarely almost glabrous; bracteoles few, purplish-tinged; ray flowers yellow, mostly 6-14 mm long; disk flowers yellow.
Achenes oblong, nerved, glabrous; pappus of white hairlike bristles.
This species was originally described as a subspecies of S. cymbalarioides (Calder & Tayl. 1965) and recently has been submerged within that species (Barkley 1994). It would appear, however, that if S. moresbiensis is to be treated as part of another species complex it would be with S. cymbalaria. The latter taxa have similar chromosome numbers, purplish-pigmented leaves and slightly overlapping ranges - differences markedly separating them from S. cymbalariodes. Recognition of S. moresbiensis at the species level (Douglas and Ruyle-Douglas 1978; Douglas 1982, Douglas et al. 1989) is easily justified when examining species differences among our other Senecio species.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist to wet bogs and slopes in the lowland to subalpine zones; locally infrequent on the Queen Charlotte Islands and extreme N Vancouver Island; N to SE AK.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Packera subnuda var. moresbiensis

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) 25 415 1020
Slope Gradient (%) 0 16 45
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
5 198 220
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
4 5 7
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: CMA(1), CWH(4), IDF(1), MH(1)


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 not evaluated, unknown or variable.

Synonyms and Alternate Names

Senecio moresbiensis (Calder & Roy L. Taylor) G.W. Douglas & G. Ruyle-Douglas

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References