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Arnica cordifolia
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Heartleaf Arnica
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Arnica cordifolia
  

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About Heartleaf Arnica (Arnica cordifolia) Arnica cordifolia is a species of arnica known by the common name heartleaf arnica. It is native to western North America from Alaska to California to New Mexico, and it is distributed as far east as Ontario and Michigan. It is a plant of many habitat types, including coniferous forests and mountain meadows. This is a rhizomatous perennial herb producing one or more erect stems reaching a maximum height near half a meter. It has two to four pairs of leaves on the stem, each on a long petiole. The leaves are heart-shaped to arrowhead-shaped and finely toothed along the edges. The flower cluster bears one or more daisylike flower heads lined with white-haired phyllaries and sometimes studded with resin glands. The center of each head contains golden yellow disc florets and a fringe of bright golden ray florets approaching 3 centimeters in maximum length. The fruit is a hairy achene up to a centimeter long, not counting its off-white pappus. Seeds are dispersed on the wind. An individual plant can live twelve years, surviving periodic wildfire by resprouting from its long, slender rhizome afterward.
Plant Description
Plant Type
Perennial herb

Max. Height
1.6 ft (0.49 m)

Form
Upright

Growth Rate
Fast

Flower Color
Yellow, White

Flowering Season
Spring
Spring
Summer
Fall
Winter


Native Status
Native

Natural Setting
Site Type
High meadows

Sun
Sun, Part Shade

Elevation ?
1767' - 11144'

Annual Precip. ?
13.1" - 137.9"

Summer Precip. ?
0.33" - 4.60"

Coldest Month ?
21.0° F - 49.3° F

Hottest Month ?
42.2° F - 69.3° F

Humidity ?
0.43 vpd - 22.28 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
Botanical Names
Arnica cordifolia var. pumila


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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