Arnica spathulata | |
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Scientific classification | |
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 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 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]