Arnica longifolia
| Arnica longifolia | |
|---|---|
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Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Genus: | Arnica |
| Species: | A. longifolia
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| Binomial name | |
| Arnica longifolia | |
| Synonyms[1] | |
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Arnica longifolia is a North American species of arnica in the sunflower family, known by the common names seep-spring arnica,[2]: 112 longleaf arnica and spearleaf arnica.[3] This flowering perennial is native to the forests of western Canada (British Columbia + Alberta[4]) and the western United States (Rocky Mountains, Cascades, Coast Ranges, Sierra Nevada and other mountains of California, Oregon, Washington, Idaho, Nevada, Utah, Wyoming, Colorado, and Montana).[5]
Description
Arnica longifolia is a rhizomatous plant forming large bunching patches of groundcover in moist, cool areas. The foliage is rough, mint-green, and sometimes sticky with glandular secretions. The stems are erect and bear daisylike flower heads with a diameter of 2 cm,[4] with deep yellow ray florets and yellow to reddish or orange disc florets. The fruit is a reddish achene with a small pappus.[6]
References
- ^ The Plant List Arnica longifolia D.C.Eaton
- ^ Great Basin Wildflowers, Laird R. Blackwell, 2006, Morris Book Publishing LLC., ISBN 0-7627-3805-7
- ^ Calflora taxon report, University of California, Arnica longifolia D. Eaton longleaf arnica, seep spring arnica
- ^ a b Kershaw, Linda; Gould, Joyce; Johnson, Derek; Lancaster, Jane; The Alberta Native Plants Council (October 2001). Rare Vascular Plants of Alberta. The University of Alberta Press, Natural Resources Canada, Canadian Forest Service. pp. 242, 254.
- ^ Biota of North America Program 2014 county distribution map
- ^ Flora of North America Vol. 21 Page 374 Spearleaf arnica Arnica longifolia D. C. Eaton in S. Watson, Botany (Fortieth Parallel). 186. 1871.
External links
- Jepson Manual Treatment
- United States Department of Agriculture Plants Profile
- Arnica longifolia in the CalPhotos photo database, University of California, Berkeley