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Montana Field Guide

Montana Field Guides

Rayless Arnica - Arnica x diversifolia
Other Names:  Arnica ovata

Native Species

Global Rank: GNA
State Rank: SNA
C-value: 5

Agency Status


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General Description
Stems solitary or clustered, erect, 15–50 cm. Herbage glabrate to glandular-puberulent. Leaves: basal petiolate on separate shoots; blades ovate, cordate to truncate, dentate, 2–6 cm long; cauline 2 to 4 pairs, short-petiolate, the middle the largest. Heads 1 to 5; involucre turbinate, 8–15 mm high. Rays 8 to13; ligules 10–15 mm long. Pappus subplumose, tawny. Achenes sparsely hirsute, glandular, 5–7 mm long (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
AK to CA, UT and
CO (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 34

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Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Moist, stony soil, of meadows, open slopes, thickets, often along streams; montane, subalpine, rarely lower or higher (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus bifarius, Bombus mixtus, and Bombus occidentalis (Mayer et al. 2000, Wilson et al. 2010).

  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 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.
    • 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.
  • Web Search Engines for Articles on "Rayless Arnica"
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Citation for data on this website:
Rayless Arnica — Arnica x diversifolia.  Montana Field Guide.  .  Retrieved on , from