Lackschewitz' Fleabane - Erigeron lackschewitzii
State Rank Reason (see State Rank above)
Endemic to Montana and adjacent Alberta though the large majority of the species' range is in Montana. Though many of the individual occurrences are small in size, the species is distributed over a relatively wide area along the Rocky Mtn Front south to the Flint Creek Range. The high elevation habitat reduces the potential for detrimental impacts.
- Details on Status Ranking and Review
Score1-2 - Small to Moderate. Population size is imprecisely known but is believed to be >2,000 individuals and <100,000 individuals.
Score2 - Regional or State Endemic or Small Montana Range: Generally restricted to an area <100,000 sq. miles (equivalent to 2/3 the size of Montana or less) or Montana contributes 50% or more of the species’ range or populations OR limited to 2-3 Sub-basins in Montana.
Area of Occupancy
Score1 - Moderate: Generally occurring in 11-25 Subwatersheds (6th Code HUC’s).
Score1 - Moderate: Species is restricted to a specific habitat that is more widely distributed or to several restricted habitats and is typically dependent upon relatively unaltered, good-quality habitat (C Values of 5-7).
ScoreNA - Rank factor not assessed.
CommentTrends unknown though populations are likely stable or experiencing only minor declines.
Score0-1 - Low to Medium.
Score0-1 - Low to Moderate Vulnerability.
Raw Conservation Status Score
5 to 8 total points scored out of a possible 16 (Rarity factors and threats only).
Lackschewitz' Fleabane is a taprooted perennial with a simple or sparingly-branched rootcrown and curved, unbranched stems that are 3-8 cm high. The basal leaves are 2-6 cm long and narrowly spoon-shaped with pointed tips. The 5-10 stem leaves are gradually reduced upwards. Foliage is sparsely to densely covered with long white hairs. The solitary flower heads are 10-15 mm wide, and the involucral bracts are green, 6-8 mm long, and densely covered with long, white hairs and sessile glands. The 30-70 blue rays are 8-11 mm long and notched at the tips. The yellow disk corollas are 3-5 mm long. There are 15-24 pappus bristles at the top of the achenes. (Montana Natural Heritage Program, 1999).
Flowering in July-early August, fruiting late July.
This species is very easily confused with some forms of Erigeron ochroleucus variety scribneri as well as Erigeron grandiflorus.
Montana (Flathead, Lewis and Clark, Pondera, and Teton counties) and Alberta (Waterton Lakes National Park, Sofa Mountain).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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Map Help and Descriptions
(Observations spanning multiple months or years are excluded from time charts)
Open, gravelly, calcareous soil and talus on ridgetops in the alpine and subalpine zones.
Ecological Systems Associated with this Species
- Commonly Associated with these Ecological Systems
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).
Threats or Limiting Factors
STATE THREAT SCORE REASON
Reported threats to Montana's populations of Lackschewitz' Fleabane are currently assigned as unknown (MTNHP Threat Assessment 2021). Populations along hiking trails are known to be at risk of some trampling by hikers, but related impacts to plants and populations are presumed to be negligible.
- 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.
- 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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- Heidel, B.L. 1993. Report on the conservation status of Erigeron lackschewitzii, a candidate threatened species. Unpublished report to U.S. Fish and Wildlife Service. Montana Natural Heritage Program, Helena, MT. 57 pp.
- Kerstetter, T. 1994. Interim report on the taxonomy of Erigeron lackschewitzii. Unpublished report to the Montana Natural Heritage Program, Helena, MT. 16 pp.
- Kerstetter, T.A. 1993. Preliminary report on taxonomy of Erigeron lackschewitzii. Unpublished report to U.S. Fish and Wildlife Service. Montana Natural Heritage Program, Helena, MT. 12 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. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
- Nesom, Guy L. 2004. Taxonomic Reevaluations in North American Erigeron (Asteraceae: Astereae). SIDA 21(1): 19–39.
- Nesom. GL and WA. Webe. 1983. A new woolly-headed, Monocephalous erigeron (Asteraceae) from Montana. Madrono 30:245-249