Rayless Arnica - Arnica x diversifolia
MNPS Threat Rank
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 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
AK to CA, UT and
CO (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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(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 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
The following animal species have been reported as pollinators of this species or genera 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
- 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.
- Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.