Arnica spathulata is a rare North American species of flowering plant in the family Asteraceae, known by the common name Klamath arnica.[3] It is native to the Klamath Mountains of northwestern California (Humboldt, Trinity, Siskiyou, and Del Norte Counties) and southwestern Oregon (Curry, Josephine, Jackson, and Douglas Counties).[4] It grows in woodland habitat, almost exclusively on serpentine soils.[3][5]
| Arnica spathulata | |
|---|---|
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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. spathulata
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| Binomial name | |
| Arnica spathulata | |
| Synonyms[2] | |
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Arnica spathulata is a rhizomatous perennial herb producing one or more hairy, glandular stems 10 to 50 centimeters tall.[3] There are several pairs of broadly lance-shaped leaves along the stem, and a cluster of leaves about the base of the stem.[3] The basal leaves are up to about 15 centimeters long and the cauline leaves, those higher on the stem, are somewhat shorter.[3][6]
The inflorescence holds many flower heads lined with phyllaries coated in long, white hairs.[3] The flower head is discoid, containing only yellow disc florets and none of the showier ray florets.[3] The fruit is an achene up to a centimeter long, not counting its white pappus.[3][7]
References
edit- ^ USDA Plants Profile
- ^ The Plant List Arnica spathulata Greene
- ^ a b c d e f g h Jepson Manual Treatment
- ^ Biota of North America Program 2014 county distribution map
- ^ Calflora taxon report, University of California, Arnica spathulata E. Greene, Klamath arnica
- ^ Greene, Edward Lee 1896. Pittonia 3(15B): 103–104
- ^ Flora of North America Vol. 21 Page 376 Klamath arnica Arnica spathulata Greene
External links
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