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Scribner's Ragwort - Senecio integerrimus var. scribneri
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State Rank Reason (see State Rank above)
See rank details.
Details on Status Ranking and Review
Population Size
Score 2-3 - Very Small to Small: Population size is imprecisely known but is believed to be <10,000 individuals.
Comment Estimated. Population data are needed.
Range Extent
Score 2 - 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
Score 2 - Low: Generally occurring in 4-10 Subwatersheds (6th Code HUC’s).
Comment Surveys for additional occurrences are needed.
Environmental Specificity
Score 1 - 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).
Trends
Score 1-3 - Declining: Species is likely declining though the magnitude of declines is uncertain. Declines may be based upon range extent and/or occupied area in the recent past (approximately 30 years).
Comment Trends are unknown. However, the taxa's habitat has been used for agricultural and ranching purposes, as such, it seems likely that some loss of habitat has occurred.
Threats
Score 1-2 - Medium to High.
Comment Information on potential threats for known locations have not been collected. Invasive species and land-use practices are potential threats within the species' habitat.
Intrinsic Vulnerability
Score 0-1 - Low to Moderate Vulnerability.
Raw Conservation Status Score
Score
9 to 13 total points scored out of a possible 19.
General Description
Distinguished from other varieties by the combination of more linear-lanceolate leaves, black-tipped phyllaries, and fewer (often 3-6) and larger heads.
Species Range
Montana Range
Range Descriptions
Native
Range Comments
MT into southern SK. Also reported for SD and NE from collections at the Rocky Mountain Herbarium; the identification of these specimens should be verified.
Observations in Montana Natural Heritage Program Database
Number of Observations: 40
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Map Help and Descriptions
Relative Density
Recency
(Observations spanning multiple months or years are excluded from time charts)
Habitat
Montana records are mostly in sagebrush shrublands and grasslands, usually with clay soils (MTNHP Point Observation Database, 2025).
Ecological Systems Associated with this Species
Ecology
POLLINATORS The following animal species have been reported as pollinators of this plant species or its genus 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).
Stewardship Responsibility
Threats or Limiting Factors
STATE THREAT SCORE REASON
References
Literature Cited AboveLegend: Senecio (Compositae). Evolution 34: 934-943.
Additional ReferencesLegend: Do you know of a citation we're missing?
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