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Montana Field Guide

Montana Field Guides

Twin Arnica - Arnica sororia

Native Species

Global Rank: G5
State Rank: S4S5

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

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General Description
Stems solitary, 20–40 cm. Herbage glandular, pubescent, sometimes with tufts of white hair among leaf bases. Leaves: basal blades short-petiolate, narrowly lanceolate, entire, 3–10 cm long; cauline 2 to 4 pairs, similar, sessile above. Heads 1 to 5; involucre hemispheric, 10–15 mm high. Rays 9 to 16; ligules 1–2 cm long. Pappus short-barbed, white. Achenes hirsute, 3–7 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range

Year-round
 


Range Comments
BC to SK south to CA, NV, UT and WY (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 488

(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
Grasslands, sagebrush steppe, open forest; plains, valleys, montane (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
  • Additional ReferencesLegend:   View Online Publication
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    • Grove, A.J. 1998. Effects of Douglas fir establishment in southwestern Montana mountain big sagebrush communities. M. Sc.Thesis. Bozeman, MT: Montana State University. 150 p.
    • Husby, P.O. 1982. Effects of grazing on vegetation in the Artemisia tridentata-Festuca idahoensis habitat type. M.Sc. Thesis. Bozeman, MT: Montana State University. 76 p.
    • Johnson, T. W. 1982. An analysis of pack and saddle stock grazing areas in the Bob Marshall Wilderness. M.Sc.Thesis. Bozeman, MT: Montana State University. 105 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
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Citation for data on this website:
Twin Arnica — Arnica sororia.  Montana Field Guide.  .  Retrieved on , from