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Chamisso arnica (Arnica chamissonis) is a perennial herbaceous plant of the aster family, generally reaching 40 to 50 cm in height. It has upright stems, simple or slightly branched, covered with fine hairs. The leaves, opposite at the base and then alternate along the stem, are lanceolate to oval, whole or slightly toothed, and bright green. Flowering occurs from early to mid-summer, with solitary or clustered flower heads, their bright yellow ray florets surrounding a golden yellow central disc. The flowers resemble those of Arnica montana, but this species is North American and better adapted to growing conditions in Quebec.

The fruits are elongated akenes topped with a silky pappus, which aids wind dispersal. Chamisso arnica grows naturally in humid meadows, along riverbanks, in clearings, and in subalpine moist areas. It prefers loose, well-drained soils that can also retain some moisture, and it adapts to full sun or light partial shade. In Quebec, it can be cultivated in massifs, garden beds, or medicinal gardens, offering both ornamental and utilitarian value.

Medicinal and culinary uses
The flowers of Chamisso arnica are known for their medicinal properties similar to those of Arnica montana. Used externally, they are applied as infused oil, ointment, or tincture to relieve bruises, contusions, sprains, and muscle pain. They possess anti-inflammatory, analgesic, and circulation-stimulating properties. Internal use is discouraged due to the potential toxicity of active compounds, particularly sesquiterpene lactones.

Ecological roles
Chamisso arnica attracts a variety of pollinators, including bees, bumblebees, and some butterflies, which visit to collect nectar and pollen. It contributes to the floral biodiversity of humid meadows and clearings, and its fibrous root system can help stabilize soil. In natural habitats, it integrates into herbaceous plant communities, providing vivid flowering in the middle of summer.

Chamisso arnica seeds require cold stratification to ensure germination. See the cultivation notes below for more details.

Akène cannot assume any responsibility for the use of plants for therapeutic purposes. Always seek advice from a professional before using a medicinal or edible plant.