Northern Prairie Wildlife Research Center
Western Wetland Flora
Field Office Guide to Plant Species
Arnica latifolia Bong.
- Family: Composite (Compositae)
- Flowering: June-August
- Field Marks: This plant differs from other species of Arnica by its sessile cauline leaves, 1-3 flowering heads, basal leaves that are not heart-shaped at the base, and brown achenes.
- Habitat: Moist forests and wet meadows in the mountains.
- Habit: Perennial herb with slender, elongated rhizomes.
- Stems: Upright, up to 2 feet tall, mostly smooth.
- Leaves: Basal and cauline, sometimes glandular, sometimes hairy, toothed, the basal ones ovate to lanceolate, usually pointed at the tip, truncate or rounded at the base but not heart-shaped, up to 10 inches long, with a distinct stalk, the caul
- Flowers: Several crowded together into usually 1-3 heads; each head up to 2 inches across, subtended by lanceolate, pointed, green, usually hairy and often glandular bracts, with 8-12 yellow rays and central yellow disk.
- Sepals: 0.
- Petals: Some united to form yellow rays 1/2-1 inch long, others united to form yellow
tubular flowers in a central disk.
- Stamens: 5.
- Pistils: Ovary inferior.
- Fruits: Achenes brown, smooth or minutely hairy, with a tuft of white hairs.
- Notes: At higher elevations, a dwarf variation of this plant occurs. It is sometimes referred to as var. gracilis.
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