Twice-hairy Butterweed - Senecio fuscatus
Senecio lindstroemii, Senecio tundricola, Tephroseris lindstroemii
* (see State Rank Reason below)
MNPS Threat Rank
State Rank Reason (see State Rank above)
Senecio fuscatus occurs in south-central Montana where populations appear to be relatively common or stable where habitat is present. Although population sizes are unknown and its distribution in Montana is small, the number of herbarium collections and information indicate a more commonly occurring plant.
- Details on Status Ranking and Review
ScoreU - Unknown
ScoreC - 250-1,000 sq km (~100-400 sq mi)
Area of Occupancy
ScoreD - 6-25 4-km2 grid cells
Number of Populations
ScoreC - 21 - 80
Number of Occurrences or Percent Area with Good Viability / Ecological Integrity
ScoreC - Few (4-12) occurrences with excellent or good viability or ecological integrity
ScoreU - Unknown
ScoreU - Unknown
ScoreD - Low
CommentNo known threats. Occurs in predominately protected or little used areas.
Plants: Perennial herb with a “short, rhizome-like woody stem-base” (Douglas et al. 1998), fibrous-rooted; stems erect, 8–25 cm (Lesica 2012), 1 to several, each having its own set of basal leaves; herbage densely covered with cobweb-like hairs (arachnoid), or long, soft strands (villous) accompanied by woolly hairs (tomentose), part of the tomentum falling away eventually (Hitchcock et al. 1955).
Leaves: Basal leaves 3-7 cm in length, 8-22 mm in width, persistent; basal leaf blades broadly lanceolate (Hitchcock et al. 1955) to obovate (Lesica 2012), with a wide sessile or winged subpetiolate base, generally well-supplied with persistent, appressed, glandular hairs beneath the tomentum; margins smooth to somewhat wavy. Cauline leaves sessile, becoming smaller upwards, narrowing to become lance-acuminate (Hitchcock et al. 1955).
Inflorescence & Heads: Inflorescence with 2 to 8 heads (Lesica 2012), closely clustered, the terminal head the biggest (Hitchcock et al. 1955). Heads radiate; involucres 5–10 mm high; phyllaries ca 21, glabrate, purplish (Lesica 2012), lacking bracteoles; disk 1-2 cm in width (Hitchcock et al. 1955). (Lesica's contribution adapted from Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
Flowering June-August (FNA 2006).
Circumpolar (Lesica 2012), including nw BC (rare), north to AK, YT and NT, disjunct in MT and WY (Douglas et al. 1998), and in the Far East of Russia (FNA 2006).
(Lesica's contribution adapted from 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)
Open tundra and alpine meadows; 3280-10,500 feet (FNA 2006).
S. fuscatus is a circumpolar alpine and tundra species. In Montana and Wyoming, it is known to grow in the high Beartooth Plateau. Northwest of Montana, it appears not to occur again until in far northwestern British Columbia, becoming more common in the Yukon and Alaska (Douglas et al. 1998). K.L. Marr, R.J. Hebda, and W.H. MacKenzie (2012) found that twelve species adapted to arctic-alpine tundra conditions, including S. fuscatus, showed similarities in their disjunct distributions. The authors offer the explanation that during the Pleistocene, suitable habitat was more extensive for these species, allowing them to spread. With the warming climate of the Holocene, they became extinct in many areas. Quite possibly, for thousands of years, the cool Beartooth Plateau has provided a refugium for S. fuscatus and at least nine other species, plant traveler companions in time and space.
The boreal woodland extends into the MacKenzie River Delta in Canada. Here, black spruce (Picea mariana) and/or white spruce (P. glauca) rise above a groundlayer of dwarf birch (Betula glandulosa), alder (Alnus spp.), willow (Salix spp.), members of the Blueberry family, and bryophytes (Gill 1974). Gill studied clearings along the MacKenzie River’s upper levees where Eskimos removed trees and shrubs from around their dwellings. Senecio fuscatus, which lives in alpine areas scantily-vegetated (Polunin 1959; Hultén 1968), had apparently come in along with other tundra species through wind dispersal. These appeared to be thriving in the clearcut areas. Spruce seedlings, on the other hand, lacked vigor and died (Gill 1974).
In areas of permafrost, additional stress from human activities such as clearcutting could possibly tip the vegetative balance from a former coniferous forest to a tundra cover. S. fuscatus was an important indicator that retrogression was occurring in the clearcut areas of the coniferous forest (Gill 1974).
Flowers & Fruit: Rays orange (Hitchcock et al. 1955), numbering 13 or 21; ligules 8–14 mm long. Disk corollas 5–7 mm long, orangish; pappus of white capillary bristles. Achenes 2–4 mm long, pubescent (Lesica 2012).(Lesica's contribution adapted from Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
- Literature Cited AboveLegend: View Online Publication
- Cody, W.J. 1996. The flora of the Yukon Territory. National Research Council of Canada Research Press, Ottawa, Canada. 643 pp.
- Douglas, G.W., G.B. Straley, D. Meidinger, and J. Pojar, editors. 1998. The Illustrated Flora of British Columbia. Volume 1. Gynmosperms and Dicotyledons (Aceraceae through Asteraceae). British Columbia Ministry of Environment, Lands and Parks and British Columbia Ministry of Forests, Victoria.
- Flora of North America Editorial Committee. 2006. Flora of North America North of Mexico. Vol. 20. Magnoliophyta: Asteridae, part 7: Asteraceae, part 2. Oxford Univ. Press, New York. xxii + 666 pp.
- Gill, D. 1974. Forestry operations in the Canadian Subarctic: an ecological argument against clear-cutting. Environmental Conservation 1(2):87-92.
- Hitchcock, C.L. 1955. Compositae. In C.L. Hitchcock, A. Cronquist, M. Ownbey, and J.W. Thompson (eds.). Vascular Plants of the Pacific Northwest. Part 5. Seattle, WA: University of Washington Press. 343 pp.
- Hulten, E. 1968. Flora of Alaska and Neighboring Territories. Stanford University Press, Stanford, CA.
- Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
- Marr, K.L., R.J. Hebda, and W.H. MacKenzie. 2012. New alpine plant records for British Columbia and a previously unrecognized biogeographical element in western North America. Botany 90:445-455.
- Polunin, N. 1959. Circumpolar Arctic Flora. Oxford: Clarendon Press, and London: Oxford University Press. xxviii+514 p.