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Shasta County Arnica
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Arnica venosa
  

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About Shasta County Arnica (Arnica venosa) Arnica venosa is an rare California species of arnica in the sunflower family known by the common name Shasta County arnica. It should not be confused with the Mt. Shasta arnica, A. viscosa. Arnica venosa is endemic to the Klamath Mountains of northwestern California, where it can be found only in Shasta and Trinity Counties. 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. The inflorescence bears a single flower head lined with hairy phyllaries. The head is discoid, containing only yellow disc florets, and no ray florets. The fruit is an achene about 7 millimeters long, not counting its white pappus.
Plant Description
Plant Type
Perennial herb

Native Status
Natural Setting
Elevation ?
606' - 4473'

Annual Precip. ?
47.2" - 85.6"

Summer Precip. ?
1.21" - 2.57"

Coldest Month ?
36.9° F - 47.9° F

Hottest Month ?
60.7° F - 72.1° F

Humidity ?
0.57 vpd - 23.11 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available


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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