Arnica viscosa

Arnica viscosa is an uncommon North American species of arnica in the sunflower family, known by the common name Mount Shasta arnica (not to be confused with the Shasta County arnica, A. venosa).[2]

Arnica viscosa
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Eudicots
(unranked):
Asterids
Order:
Asterales
Family:
Asteraceae
Tribe:
Heliantheae
Genus:
Arnica
Species:
A. viscosa
Binomial name
Arnica viscosa
Synonyms[1]
  • Chrysopsis shastensis Jeps.
  • Raillardella paniculata Greene

It is native to the Klamath Mountains and nearby southern Cascade Range in northern California (Shasta, Siskiyou and Trinity Counties) and southern Oregon (Josephine, Douglas, Klamath, and Deschutes Counties).[3][4] It grows in subalpine to alpine habitats.[2]

Description

Arnica viscosa is a perennial herb usually producing one or more hairy, glandular stems 20 to 50 centimeters tall. There are five to ten pairs of oblong leaves along the stem each a few centimeters long.[2][5]

The inflorescence bears many flower heads lined with hairy, glandular phyllaries. The head is discoid, containing only yellow disc florets, and no ray florets.[2][5]

The fruit is an achene about 5 or 6 millimeters long, not counting its white to brownish pappus.[2][5]

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References
  1. The Plant List Arnica viscosa A.Gray
  2. Flora of North America Vol. 21 Page 377 Mt. Shasta arnica Arnica viscosa A. Gray
  3. Biota of North America Program 2014 county distribution map
  4. Calflora taxon report, University of California, Mt. Shasta arnica
  5. Gray, Asa 1878. Proceedings of the American Academy of Arts and Sciences 13: 374


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