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Arnica longifolia is a species of arnica known by the common names longleaf arnica and spearleaf arnica. This flowering perennial is native to the forests western North America from Canada to the high mountains of California. It is a rhizomatous plant forming large bunching patches of groundcover in moist, cool areas. The foliage is rough, mint-green, and sometimes sticky with glandular secretions. The stems are erect and bear daisylike flower heads with deep yellow ray florets and yellow to reddish or orange disc florets. The fruit is a reddish achene with a small pappus.
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