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Mount Shasta Arnica Back to Plant Page
Arnica viscosa

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About Mount Shasta Arnica (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). 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). It grows in subalpine to alpine habitats. 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. The inflorescence bears many flower heads lined with hairy, glandular phyllaries. The head is discoid, containing only yellow disc florets, and no ray florets. The fruit is an achene about 5 or 6 millimeters long, not counting its white to brownish pappus.
Plant Description
Plant Type
Perennial herb

Max. Height
0.7 - 1.6 ft (0.21 - 0.49 m)

Flower Color

Native Status
Natural Setting
Elevation ?
4818' - 14114'

Annual Precip. ?
51.9" - 139.7"

Summer Precip. ?
1.51" - 5.09"

Coldest Month ?
10.8° F - 38.6° F

Hottest Month ?
34.1° F - 57.3° F

Humidity ?
1.29 vpd - 11.85 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Mt. Shasta Arnica

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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