Arnica cordifolia
| Arnica cordifolia | |
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| File:Arnica cordifolia 4631.JPG | |
| Swauk Forest Discovery Trail, Wenatchee Mountains, Washington | |
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A. cordifolia
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| Binomial name | |
| Arnica cordifolia |
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Arnica cordifolia is a species of arnica in the sunflower family, known by the common name heartleaf arnica.[2] It is native to western North America from Alaska to California to New Mexico, as far east as Ontario and Michigan.[3] It is a plant of many habitat types, including coniferous forests and mountain meadows.[4]
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 inflorescence 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.[4]
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.[4][5]
References
- ↑ The International Plant Names Index
- ↑ Calflora taxon report, University of California, Arnica cordifolia Hook. heart leaved arnica, heartleaf arnica
- ↑ Biota of North America Program 2014 state-level distribution map
- ↑ 4.0 4.1 4.2 Flora of North America Vol. 21 Page 374 Heartleaf arnica, Arnica cordifolia Hooker, Fl. Bor.-Amer. 1: 331. 1834.
- ↑ Ecology Fire Ecology
External links
Media related to Arnica cordifolia at Wikimedia Commons- Jepson Manual Treatment
- United States Department of Agriculture Plants Profile
- Calphotos Photo gallery, University of California
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