Packera streptanthifolia (Greene) W.A. Weber & Á. Löve
Rocky Mountain butterweed
Asteraceae (Aster family)

Introduction to Vascular Plants


© Bryan Kelly-McArthur     (Photo ID #77979)


E-Flora BC Static Map

Distribution of Packera streptanthifolia
Click here to view the full interactive map and legend

Species Information

Perennial herb from a fibrous-rooted woody stem-base or short rhizome; stems erect, solitary, branched above, glabrous, 10-60 cm tall.
Basal leaves oblanceolate to egg-shaped or rounded, toothed or shallowly lobed mostly above the middle, somewhat succulent, stalked, 2-8 cm long including the stalk, 0.4-4 cm wide, glabrous; stem leaves few, oblanceolate to more linear, toothed or cleft, sometimes woolly in the leaf axils, progressively reduced upwards, becoming unstalked.
Heads with ray and disk flowers, few to many on glabrous or sparsely woolly-hairy stalks in a compact inflorescence; involucres 4-8 mm tall; involucral bracts lanceolate, sometimes purplish and hairy at the tips, glabrous, margins translucent; bracteoles few, inconspicuous; ray flowers yellow, mostly 5-12 mm long; disk flowers yellow.
Achenes oblong, faintly ribbed, glabrous; pappus of white hairlike bristles.

SourceThe Illustrated Flora of British Columbia


If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.


Ecological Framework for Packera streptanthifolia

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)
1347 180 2400
Slope Gradient (%)
17 0 82

Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]

199 4 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 0 7
Modal Nutrient Regime
# of field plots
 species was recorded in:
Modal BEC Zone Class

All BEC Zones (# of stations/zone) species was recorded in

AT(4), BAFA(2), BWBS(2), CWH(1), ESSF(61), ICH(4), IDF(70), IMA(1), MS(62), PP(1), SBPS(64), SBS(8), SWB(2)

Habitat and Range

Mesic to dry meadows, rocky slopes and forests from the montane to alpine zones; common throughout BC except immediate coast; N to AK, YT, and NT and S to UT and CA.

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Packera cymbalarioides (Nutt.) W.A. Weber & A. Löve, nom. illeg.
Packera oodes (Rydb.) W.A. Weber
Packera streptanthifolia var. rubricaulis (Greene) Dorn
Packera streptanthifolia var. streptanthifolia
Senecio acutidens Rydb.
Senecio adamsii Howell
Senecio aureus var. borealis Torr. & A. Gray
Senecio cymbalarioides Nutt., nom. illeg., non Senecio cymbalarioides H. Buek
Senecio cymbalarioides var. borealis (Torr. & A. Gray) Greenm.
Senecio cymbalarioides var. suksdorfii (Greenm.) M. Peck
Senecio fulgens Rydb.
Senecio jonesii Rydb.
Senecio laetiflorus Greene
Senecio leonardii Rydb.
Senecio longipetiolatus Rydb.
Senecio oodes Rydb.
Senecio pammelii Greenm.
Senecio platylobus Rydb.
Senecio rubricaulis Greene
Senecio streptanthifolius Greene
Senecio streptanthifolius var. borealis (Torr. & A. Gray) J.F. Bain
Senecio streptanthifolius var. kluanei J.F. Bain
Senecio streptanthifolius var. laetiflorus (Greene) J.F. Bain
Senecio streptanthifolius var. oodes (Rydb.) J.F. Bain
Senecio streptanthifolius var. rubricaulis (Greene) J.F. Bain
Senecio streptanthifolius var. wallowensis J.F. Bain
Senecio subcuneatus Rydb.
Senecio suksdorfii Greenm.
Senecio wardii Greene