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Montana Field Guides

Scribner's Ragwort - Senecio integerrimus var. scribneri

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Species of Concern
Native Species

Global Rank: G5T2T3
State Rank: S2S3
(see State Rank Reason below)

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

External Links

State Rank Reason (see State Rank above)
See rank details.
  • Details on Status Ranking and Review
    Scribner's Ragwort (Senecio integerrimus var. scribneri) Conservation Status Review
    Review Date = 04/02/2013
    View State Conservation Rank Criteria
    Population Size

    Score2-3 - Very Small to Small: Population size is imprecisely known but is believed to be <10,000 individuals.

    CommentEstimated. Population data are needed.

    Range Extent

    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

    Score2 - Low: Generally occurring in 4-10 Subwatersheds (6th Code HUC’s).

    CommentSurveys for additional occurrences are needed.

    Environmental Specificity

    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).

    Trends

    Score1-3 - 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).

    CommentTrends 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

    Score1-2 - Medium to High.

    CommentInformation 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

    Score0-1 - 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
Present
 


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

(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)



Ecological Systems Associated with this Species

References
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Citation for data on this website:
Scribner's Ragwort — Senecio integerrimus var. scribneri.  Montana Field Guide.  .  Retrieved on , from