Taprooted Fleabane - Erigeron radicatus
(see State Rank Reason below)
State Rank Reason (see State Rank above)
Known from at least a dozen mountain ranges and over two dozen specimen collections from western and central Montana. Most collections describe the abundance as common at the collection site. Sites are generally high elevations in the mountains serving to limit the potential for negative impacts to populations.
Taprooted perennial with a usually branched caudex. Stems ascending to erect, 2–6 cm. Herbage leaves glabrate; stems densely strigose. Leaves mostly basal, linear-oblanceolate, entire, 1–5 cm long. Heads solitary, radiate. Involucres hemispheric, 4–7 mm high; phyllaries in 2 or 3 series, villous-hirsute with purple-septate hairs, sometimes minutely glandular. Rays 20 to 45, white; ligules 4–7 mm long. Disk corollas 2.5–3 mm long. Achenes ca. 2 mm long (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX
Flowering occurs from mid-June to mid-August depending on local site conditions.
AB, SK south to UT, WY and NE (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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(Observations spanning multiple months or years are excluded from time charts)
Dry, rocky sites in the alpine and subalpine; commonly on limestone.
The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus bifarius
, Bombus centralis
, Bombus fervidus
, Bombus flavifrons
, Bombus huntii
, Bombus melanopygus
, Bombus mixtus
, Bombus rufocinctus
, Bombus occidentalis
, and Bombus insularis
(Thorp et al. 1983, Wilson et al. 2010, Colla and Dumesh 2010, Koch et al. 2012).
- Literature Cited AboveLegend: View Online Publication
- Colla, S.R. and S. Dumesh. 2010. The bumble bees of southern Ontario: notes on natural history and distribution. Journal of the Entomological Society of Ontario 141:39-68.
- Koch, J., J. Strange, and P. Williams. 2012. Bumble bees of the western United States. Washington, DC: USDA Forest Service, Pollinator Partnership. 143 p.
- Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
- 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.
- 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
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- Hawkins, P.H. 1903. The alpine flora of Montana. M.Sc. Thesis, Bozeman, MT: Montana State University. 24 pp.
- Jones, W. W. 1901. Preliminary flora of Gallatin County. M.S. Thesis. Bozeman, MT: Montana State College. 78 pp.
- Kerstetter, T.A. 1994. Taxonomic investigation of Erigeron lackschewitzii. M.Sc. Thesis. Bozeman, MT: Montana State University. 90 p.
- Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
- Williams, K.L. 2012. Classification of the grasslands, shrublands, woodlands, forests and alpine vegetation associations of the Custer National Forest portion of the Beartooth Mountains in southcentral Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 376 p.