Clasping Groundsel - Senecio amplectens
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
Score3 - Vey Small: Generally <2,000 individuals.
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).
Score1-2 - Moderate to High.
Score0-3 - Population trends are unknown.
Score2-3 - High to Very High.
CommentKnown population may be detrimentally impacted by adjacent road and related activity.
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
11 to 16 total points scored out of a possible 19.
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.
Flowering in late July-early August.
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.
Known from Carbon County. MT to NV, UT and NM (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
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)
Stony, open soil and talus of slopes in or near the alpine zone.
Ecological Systems Associated with this Species
- Commonly Associated with these Ecological Systems
- Additional ReferencesLegend: View Online Publication
Do you know of a citation we're missing?
- Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.