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Arnica longifolia
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Seep Spring Arnica
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Arnica longifolia

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About Seep Spring Arnica (Arnica longifolia) Arnica longifolia is a species of arnica known by the common names longleaf arnica and spearleaf arnica. This flowering perennial is native to the forests western North America from Canada to the high mountains of California. It is a rhizomatous plant forming large bunching patches of groundcover in moist, cool areas. The foliage is rough, mint-green, and sometimes sticky with hairy secretions. The stems are erect and bear daisylike flower heads with deep yellow ray florets and yellow to reddish or orange disc florets. The fruit is a reddish achene with a small pappus.
Plant Description
Plant Type
Perennial herb

Max. Height
2 ft (0.6 m)


Growth Rate

Flower Color
Yellow, Orange, Green, Red

Flowering Season

Native Status

Natural Setting
Site Type
Open, wet meadows

Shade, Part Shade

Elevation ?
1762' - 11412'

Annual Precip. ?
6.5" - 121.3"

Summer Precip. ?
0.42" - 4.13"

Coldest Month ?
20.1° F - 46.7° F

Hottest Month ?
41.2° F - 73.8° F

Humidity ?
0.59 vpd - 28.26 vpd

Soil Description
Adaptable, tolerant of sand, loam and clay

Sunset Zones ?
1*, 2, 3, 4, 5, 6*, 7, 14, 15*, 16*, 17*, 18, 19, 20, 21, 22, 23, 24

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Spearleaf Arnica, Longleaf 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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