Higher classification Arnica | Tribe Heliantheae Scientific name Arnica venosa Rank Species | |
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Similar Arnica discoidea, Arnica ovata, Arnica, Arnica lanceolata, Arnica parryi | ||
Arnica venosa is an rare California species of arnica in the sunflower family known by the common name Shasta County arnica. It should not be confused with the Mt. Shasta arnica, A. viscosa.
Arnica venosa is endemic to the Klamath Mountains of northwestern California, where it can be found only in Shasta and Trinity Counties.
Description
Arnica venosa is a perennial herb usually producing one or more hairy, glandular stems up to about 50 centimeters tall. There are six to ten pairs of veiny, toothed leaves along the stem, each lance- to oval-shaped and 3 to 7 centimeters long.
The inflorescence bears a single flower head lined with hairy phyllaries. The head is discoid, containing only yellow disc florets, and no ray florets.
The fruit is an achene about 7 millimeters long, not counting its white pappus.