Arnica spathulata
| Arnica spathulata | |
|---|---|
| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Eudicots |
| (unranked): | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Tribe: | Heliantheae |
| Genus: | Arnica |
| Species: | A. spathulata |
| Binomial name | |
| Arnica spathulata Greene[1] | |
| Synonyms[2] | |
| |
Arnica spathulata is a rare North American species of arnica in the sunflower family, 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]
References
- ↑ USDA Plants Profile
- ↑ The Plant List Arnica spathulata Greene
- 1 2 3 4 5 6 7 8 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
