Arnica venosa

Arnica venosa is a rare California species of arnica in the sunflower family known by the common name Shasta County arnica.[1] It should not be confused with the Mt. Shasta arnica, A. viscosa.

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

Arnica venosa is endemic to the Klamath Mountains of northwestern California, where it can be found only in Shasta and Trinity Counties.[2][3]

Description

Arnica venosa is a perennial herb usually producing one or more hairy, glandular stems up to about 50 centimeters tall. There are six to ten pairs of veiny, toothed leaves along the stem, each lance- to oval-shaped and 3 to 7 centimeters long.[4][1]

The inflorescence bears a single flower head lined with hairy phyllaries. The head is discoid, containing only yellow disc florets, and no ray florets.[4][1]

The fruit is an achene about 7 millimeters long, not counting its white pappus.[4][1]

References
  1. Flora of North America FNA Vol. 21 Page 376 Shasta County arnica Arnica venosa H. M. Hall
  2. Biota of North America Program 2014 county distribution map
  3. Calflora taxon report, University of California, Arnica venosa H.M. Hall, Shasta County arnica, Veiny arnica
  4. Hall, Harvey Monroe. 1915. University of California Publications in Botany 6(7): 174–175


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