Arnica sororia

Arnica sororia
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Asterales
Family: Asteraceae
Tribe: Heliantheae
Genus: Arnica
Species: A. sororia
Binomial name
Arnica sororia
Greene

Arnica sororia is a North American species of arnica known by the common name twin arnica.[1] It is native to western Canada (British Columbia, Alberta, Saskatchewan) and the western United States (Washington, Oregon, California, Nevada, Utah, Idaho, Montana, Wyoming, South Dakota).[2] It grows in grasslands and in conifer forests.[3]

Arnica sororia is a rhizomatous perennial herb producing one or more hairy, glandular stems 10 to 50 centimeters tall. There are several pairs of broadly lance-shaped leaves along the stem, the lower ones borne on petioles. Leaves may reach up to 14 centimeters long.[4]

The inflorescence holds one to five daisy-like flower heads lined with phyllaries coated in glandular hairs. The flower head has a center of glandular yellow disc florets and a fringe of yellow ray florets. The fruit is an achene a few millimeters long with a white pappus.[4]

References

  1. ↑ Calflora taxon report, University of California, Arnica sororia E. Greene, twin arnica
  2. ↑ Biota of North America Program 2014 county distribution map
  3. ↑ Flora of North America Vol. 21 Page 370 Twin arnica Arnica sororia Greene
  4. 1 2 Greene, Edward Lee 1910. Ottawa Naturalist 23(12): 213

External links


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