Northern Prairie Wildlife Research Center
Western Wetland Flora
Field Office Guide to Plant Species
Arnica diversifolia Greene
- Family: Composite (Compositae)
- Flowering: July-September
- Field Marks: This Arnica has 3 or 4 pairs of irregularly toothed leaves on the stem, flower heads with 8-15 pale yellow rays 3/4-1 inch long, and tawny-colored soft bristles on the achenes.
- Habitat: Wet, often rocky, areas.
- Habit: Perennial herb with branching rhizomes.
- Stems: Upright, unbranched, up to 15 inches tall, smooth or glandular-hairy.
- Leaves: Leaves on the stem 3-4 pairs, opposite, elliptic to ovate, up to 2 1/2 inches long, up to 2 1/2 inches wide, rounded or pointed at the tip, rounded at the base, irregularly toothed, rough-hairy, sessile or on short stalks; basal leaves,
- Flowers: Crowded into heads, with few to several heads at the tip of the stem; heads up to 2 inches across, bearing both ray flowers and disk flowers; heads subtended by pointed, narrow, green bracts that have some long hairs, some of which may
- Sepals: 0.
- Petals: Some united to form 8-15 pale yellow rays 3/4-1 inch long; others united into tubes that comprise the central yellow disk.
- Stamens: 5.
- Pistils: Ovary inferior, hairy.
- Fruits: Achenes short-hairy, with tawny soft bristles at the tip.
- Notes: This is a rather variable species, similar to A. mollis but differing mostly by having the stem leaves larger than the basal leaves.
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