Arnica cordifolia

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Arnica cordifolia
Arnica cordifolia 4631.JPG
Swauk Forest Discovery Trail, Wenatchee Mountains, Washington
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Asterales
Family: Asteraceae
Tribe: Heliantheae
Genus: Arnica
Species: A. cordifolia
Binomial name
Arnica cordifolia
Hook.
Synonyms

Arnica cordifolia is a species of arnica in the sunflower family, known by the common name heartleaf arnica.[2] It is native to western North America from Alaska to California to New Mexico, as far east as Ontario and Michigan.[3] It is a plant of many habitat types, including coniferous forests and mountain meadows.[4]

This is a rhizomatous perennial herb producing one or more erect stems reaching a maximum height near half a meter. It has two to four pairs of leaves on the stem, each on a long petiole. The leaves are heart-shaped to arrowhead-shaped and finely toothed along the edges. The inflorescence bears one or more daisylike flower heads lined with white-haired phyllaries and sometimes studded with resin glands. The center of each head contains golden yellow disc florets and a fringe of bright golden ray florets approaching 3 centimeters in maximum length.[4]

The fruit is a hairy achene up to a centimeter long, not counting its off-white pappus. Seeds are dispersed on the wind. An individual plant can live twelve years, surviving periodic wildfire by resprouting from its long, slender rhizome afterward.[4][5]

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