Northern Prairie Wildlife Research Center
Western Wetland Flora
Field Office Guide to Plant Species
Arnica chamissonis Less.
- Family: Composite (Compositae)
- Flowering: June-August
- Field Marks: This species differs from other species of Arnica by having 5-10 pairs of leaves on the stem and pale yellow flower heads up to 2 inches across, with each head subtended by bracts with a rounded tip and a tuft of hairs at the
- Habitat: Wet meadows and other moist places in the mountains.
- Habit: Perennial herb with elongated rhizomes.
- Stems: Upright, unbranched, up to 2 1/2 feet tall, hairy, with the hairs sometimes glandular and sticky.
- Leaves: Opposite, simple, with 5-10 pairs per stem, lanceolate to oblanceolate, up to 8 inches long, up to 2 inches wide, hairy, with or without teeth, all but the lowermost sessile.
- Flowers: Crowded into heads up to 2 inches across, pale yellow, with 12-18 ray flowers and many disk flowers; heads subtended by several bracts, the bracts rounded at the tip, up to 1/2 inch long, with a tuft of hairs at the tip.
- Sepals: 0.
- Petals: 5, pale yellow, some of them united to form a ray, others united to form a tube.
- Stamens: 5.
- Pistils: Ovary inferior, somewhat hairy.
- Fruits: Achenes usually somewhat hairy, narrowly ellipsoid, up to 1/4 inch long, with a tuft of tawny bristles at the tip.
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