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

Packera plattensis (Nutt.) W.A. Weber & Á. Löve
plains butterweed
Asteraceae (Aster family)

Introduction to Vascular Plants

© Jeremy Gatten  Email the photographer   (Photo ID #24040)

E-Flora BC Static Map
Distribution of Packera plattensis
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Species Information

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Perennial herb from a fibrous-rooted, short woody stem-base; stems erect, solitary, branched above, thinly to moderately white woolly-hairy, 16-50 cm tall.
Basal leaves lanceolate to oblanceolate, stalked, 2-11 cm long including the stalk, 0.3-3.7 cm wide, nearly entire or toothed, long-hairy to densely white woolly-hairy; stem leaves similar, becoming lanceolate, white woolly-hairy in the leaf axils, progressively reduced upwards, becoming unstalked.
Heads with ray and disk flowers, few to several on white woolly-hairy stalks in a clustered inflorescence; involucres 5-8 mm tall; involucral bracts lanceolate, green or purplish-tipped, glabrous, densely long-hairy below, margins translucent; bracteoles few, inconspicuous; ray flowers yellow, mostly 5-10 mm long; disk flowers yellow.
Achenes oblong, nerved, glabrous or rarely coarse-hairy; pappus of white hairlike bristles.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry open meadows and forests in the steppe and montane zones; rare in E and C BC; disjunct, E to S ON and S to LA, TX , MT and AZ.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Packera plattensis

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) 990 1125 1260
Slope Gradient (%) 0 2 5
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
270 270 270
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: IDF(1), SBPS(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 plattensis Nutt.
Senecio pseudotomentosus Mack. & Bush

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References