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MONTANA FIELD GUIDE™

MONTANA FIELD GUIDE™

 

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)
State Threat Score: No Known Threats
CCVI: Less Vulnerable
C-value:


Agency Status
USFWS:
USFS:
BLM:


 





State Rank Reason (see State Rank above)
Senecio integerrimus variety scribneri is endemic to Montana where populations are rare to uncommon in the central and eastern portions of the state. Plants are found in grassland and sage steppe habitats, often where land is used for agriculture and ranching. Observation data reported from 2000 to 2024 predominantly comes from 2 counties (Phillips and Valley). Whereas, data reported for 14 other counties is very old, 1979 to 1883. Thus, the statewide status of Senecio integerrimus var. scribneri populations and habitat conditions is largely unknown.

Surveys and monitoring that bring forth current information on presence/absence, population counts and viability, habitat conditions, and potential threats is greatly needed. Surveys on lands modelled as predicted suitable habitat are also greatly needed to better understand its distribution in Montana.
Scribner's Ragwort (Senecio integerrimus var. scribneri) Conservation Status Summary
State Rank: S2S3
Review Date = 12/23/2025
See the complete Conservation Status Rank Report
How we calculate Conservation Status Ranks
CC BY NC
 
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
Range in Montana
CC BY NC
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: 41
(Click on the following maps and charts to see full sized version)
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).
Predicted Suitable Habitat Model

This species has a Predicted Suitable Habitat Model available.

To learn how these Models were created see here

National Vegetation Classification System Groups Associated with this Species
Shrubland
Sagebrush Shrubland
Basin and Wyoming Big (Threetip) Sagebrush Shrubland HOC HGCN
Grassland
Lowland - Prairie Grassland
Great Plains Dry Mixedgrass Prairie HGCN

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).


Threats or Limiting Factors
Reported threats for Scribner's Ragwort include habitat modification from agricultural and ranching practices and competition from invasive, noxious, and/or non-native plant species. Data that quantifies impacts is not available.

Climate change may also pose a potential low risk to state's populations. The MTNHP conducted a species-level assessment using the Climate Change Vulnerability Index (CCVI) in 2021, which resulted in an Less Vulnerable rating to climate change. Climate change including increased ambient temperatures, decreased snowpacks, and increased frequencies and severities of drought could have negative impacts on this species; however, field-based data on the timing and magnitude from climate change is not available.

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.
    • MTNHP Threat Assessment. 2021. State Threat Score Assignment and Assessment of Reported Threats from 2006 to 2021 for State-listed Vascular Plants. Botany Program, Montana Natural Heritage Program, Helena, Montana.
    • 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. 208 p.
    • 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?
    • Joslin, G.J. 1975. Behavior and environmental selection by Elk (Cervus canadensis nelsoni) during surrmer and fall in the First and Second Yellow Mule drainages, Madison County, Montana. M.Sc. Thesis. Bozeman, Montana: Montana State University, Bozeman. 65 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 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.
  • Web Search Engines for Articles on "Scribner's Ragwort"
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Citation for data on this website:
Scribner's Ragwort — Senecio integerrimus var. scribneri.  MONTANA FIELD GUIDE™.  .  Retrieved on , from