Arnica longifolia
longleaf arnica, seep spring arnica, spear-leaf leopardbane
WTU specimens
Other herbaria

Distribution: Southern Alberta south to Washington, Colorado and California.

Habitat: Rocky soil in seeps or springs, cliffs, or riverbanks, at moderate to high elevations in the mountains.

Flowers: July - September

Origin: Native

Conservation Status: Not of concern


Densely tufted perennial, often in large patches, from a short rhizome; many sterile, leafy stems; flowering stems leafy, 3-6 dm. high.


Leaves opposite, 5-7 pairs, the lower sheathing, with reduced blade; other leaves nearly sessile, only slightly reduced upward, lanceolate or lance-elliptic with a pointed tip, entire, 5-12 cm. long and 1-2 cm. wide; no basal leaves.


Heads several to many; involucre 7-10 mm. high, the bracts sharply pointed; rays 8-13, yellow, pistillate, 1-2 cm. long; disk flowers yellow; pappus tawny, barbellate.


Achenes glandular and hairy or sub-glabrous.

Accepted Name:
Arnica longifolia D.C. Eaton
Publication: Botany (Fortieth Parallel). 186. 1871.

Synonyms & Misapplications:
Arnica longifolia D.C. Eaton ssp. myriadenia (Piper) Maguire
Additional Resources:

PNW Herbaria: Specimen records of Arnica longifolia in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Arnica longifolia checklist entry.

E-Flora BC: Arnica longifolia atlas page.

CalPhotos: Arnica longifolia photos.

USDA Plants: Arnica longifolia information.

18 photographs:
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