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Montana Field Guide

Montana Field Guides

Clasping Groundsel - Senecio amplectens
Other Names:  Ligularia amplectens

Species of Concern

Global Rank: G4
State Rank: S1S2
* (see State Rank Reason below)

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank: 1
C-value: 8

External Links






State Rank Reason (see State Rank above)
In Montana, only known from the Beartooth (Line Creek) Plateau. Additional data on population size, trends and potential threats are needed to evaluate the species' vulnerability.
  • Details on Status Ranking and Review
    Clasping Groundsel (Senecio amplectens) Conservation Status Review
    Review Date = 05/30/2012
    View State Conservation Rank Criteria
    Population Size

    Score3 - Vey Small: Generally <2,000 individuals.

    Range Extent

    Score1 - Peripheral, Disjunct or Sporadic Distribution in MT: Widespread species that is peripheral, disjunct or sporadically distributed within MT such that it occurs in <5% of the state (<7,500 sq. miles or the combined area of Beaverhead and Ravalli Counties) or is restricted to 4-5 sub-basins.

    Area of Occupancy

    Score3 - Very Low: Generally occurring in 3 or fewer Subwatersheds (6th Code HUC’s).

    Environmental Specificity

    Score1-2 - Moderate to High.

    Trends

    Score0-3 - Population trends are unknown.

    Threats

    Score2-3 - High to Very High.

    CommentKnown population may be detrimentally impacted by adjacent road and related activity.

    Intrinsic Vulnerability

    Score1 - Moderate Vulnerability: Specific biological attributes, unusual life history characteristics or limited reproductive potential makes the species susceptible to extirpation from stochastic events or other adverse impacts to its habitat and slow to recover.

    Raw Conservation Status Score

    Score 11 to 16 total points scored out of a possible 19.

 
General Description
Clasping Groundsel is a glabrous herb with several lax to ascending stems that are 1-2 dm tall and arising from a short rhizome and fibrous roots. The few narrowly elliptic basal leaves are 5-18 cm long and have petioles and coarsely toothed margins. The alternate stem leaves are similar but smaller upward, and the uppermost lack petioles. Flowers are borne in 1-3 terminal, nodding heads. The heads have a single series of ca. 21 non-overlapping, narrow, pointed, involucral bracts that are 10-15 mm long. Disk flowers are yellow, and the 8-13 yellow rays are 1-2 cm long. The achene is glabrous with a pappus at its summit.

Phenology
Flowering in late July-early August.

Diagnostic Characteristics
Senecio is a large genus, and a technical manual should be consulted for positive identification. The rocky alpine habitat and 1 to a few nodding heads help distinguish this species from others.

Species Range
Present
 


Range Comments
Known from Carbon County. MT to NV, UT and NM (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 3

(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)



Habitat
Stony, open soil and talus of slopes in or near the alpine zone.

Ecological Systems Associated with this Species

References
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Citation for data on this website:
Clasping Groundsel — Senecio amplectens.  Montana Field Guide.  .  Retrieved on , from