Arnica sororia
Asteraceae
Twin Arnica
Erect, 1 to several 8–20 in. stems, sometimes branched, glands and hairs on upper stems, white hairs in axils. Leaves in 2–6 pairs, 1–16 in., lance-shaped to oblong, mostly sessile, spaced far apart along stem. Flower heads single to few atop stem, each with 8–23 ray flowers, 1/2–1 in. long. Grows in damp meadows, dry rocky soils in sagebrush communities, at mid elevations. Similar A. rydbergii is half as tall, grows in dry meadows, mostly high in mountains.
- Rarity: Rare
- Flowering Time: Early Summer
- Flower Form: Senecio Tribe
- Life Cycle: Perennial
- Height: 8–24 inches
- Habitat: East-side Forest, Meadow, Shrub-Steppe
- Found In: N Cascades NP, Steens, Wallowas
- Native: Yes
- Also Known As: Bunch Arnica
