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Montana Field Guides

Few-flowered Butterweed - Senecio pauciflorus
Other Names:  Packera pauciflora

Status Under Review
Native Species

Global Rank: G5
State Rank: SU

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value:

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General Description
Few-flowered Butterweed is a glabrous, perennial herb with stems that are 15-40 cm high and arising from a simple or branched rootcrown with fibrous roots. The basal leaves are 3-10 cm long and have long petioles and thick, spade-shaped blades with coarsely toothed margins. The alternate stem leaves, some with a pair of basal lobes, become smaller and sessile upward. Usually, 2-6 erect flower heads are borne in a crowded, terminal inflorescence. Each flower head has a single series of reddish-purple, narrow, pointed involucral bracts that are 6-8 mm long. Disk flowers are orange to reddish. Rays are inconspicuous or lacking. The achene has a pappus at its summit.

Phenology
Flowering in June.

Diagnostic Characteristics
Senecio is a large genus, and a technical manual should be consulted for positive identification. Senecio debilis and S. indecorus have more deeply lobed lower leaves and are generally found at lower elevations.

Species Range
Unknown/Undetermined
 


Range Comments
AK and YK east to QC and NL, south to CA and WY (Packer, 2000, in Fl. Alberta).

Observations in Montana Natural Heritage Program Database
Number of Observations: 39

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat
Moist meadows and cliffs in the montane zone.

Ecology
POLLINATORS
The following animal species have been reported as pollinators of this species or genera where their geographic ranges overlap: Bombus bifarius, Bombus flavifrons, Bombus frigidus, Bombus huntii, Bombus melanopygus, Bombus mixtus, Bombus sylvicola, Bombus occidentalis, Bombus insularis, Bombus suckleyi, Bombus flavidus, and Bombus kirbiellus (Schmitt 1980, Thorp et al. 1983, Mayer et al. 2000, Wilson et al. 2010, Pyke et al. 2012, Koch et al. 2012, Williams et al. 2014).

References
  • Literature Cited AboveLegend:   View Online Publication
    • Koch, J., J. Strange, and P. Williams. 2012. Bumble bees of the western United States. Washington, DC: USDA Forest Service, Pollinator Partnership. 143 p.
    • Mayer, D.F., E.R. Miliczky, B.F. Finnigan, and C.A. Johnson. 2000. The bee fauna (Hymenoptera: Apoidea) of southeastern Washington. Journal of the Entomological Society of British Columbia 97: 25-31.
    • Pyke, G.H., D.W. Inouye, and J.D. Thomson. 2012. Local geographic distributions of bumble bees near Crested Butte, Colorado: competition and community structure revisited. Environmental Entomology 41(6): 1332-1349.
    • Schmitt, J. 1980. Pollinator foraging behavior and gene dispersal in Senecio (Compositae). Evolution 34: 934-943.
    • Thorp, R.W., D.S. Horning, and L.L. Dunning. 1983. Bumble bees and cuckoo bumble bees of California (Hymenoptera: Apidae). Bulletin of the California Insect Survey 23:1-79.
    • Williams, P., R. Thorp, L. Richardson, and S. Colla. 2014. Bumble Bees of North America. Princeton, NJ. Princeton University Press.
    • Wilson, J.S., L.E. Wilson, L.D. Loftis, and T. Griswold. 2010. The montane bee fauna of north central Washington, USA, with floral associations. Western North American Naturalist 70(2): 198-207.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Simanonok, M. 2018. Plant-pollinator network assembly after wildfire. Ph.D. Dissertation. Bozeman, MT: Montana State University. 123 p.
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Citation for data on this website:
Few-flowered Butterweed — Senecio pauciflorus.  Montana Field Guide.  .  Retrieved on , from