Page author: Don Knoke
Arnica sororia
bunch arnica, twin arnica, twin leopardbane
WTU specimens
Other herbaria

Distribution: Chiefly east of the Cascades, British Columbia to California, east to Wyoming.

Habitat: Open, often rather dry places, but usually vernally moist, in the foothills and at moderate elevations in the mountains.

Flowers: May - July

Origin: Native

Conservation Status: Not of concern

Description:
General:

Perennial from slender rhizomes, the slender stems 2-6 dm. tall

Leaves:

Basal leaves petiolate, the blades lanceolate, 3-12 cm. long and 1-2.5 cm. wide; cauline leaves 2-4 pair, the lower ones with short petioles, reduced upward.

Flowers:

Heads few; involucres 10-15 mm high, the bracts narrow, tapering from the base, pointed; disk corollas with stalked glands; pappus white

Identification Notes:

The similar Arnica fulgens has long, woolly brown hairs in the axils of the lower leaves; A sororia usually has no axillary hairs; if any are present, they are white.

Accepted Name:
Arnica sororia Greene
Publication: Ottawa Naturalist. 23: 213. 1910.

Synonyms & Misapplications:
Arnica fulgens Pursh var. sororia (Greene) G.W. Douglas & Ruyle-Douglas
Additional Resources:

PNW Herbaria: Specimen records of Arnica sororia in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Arnica sororia checklist entry.

E-Flora BC: Arnica sororia atlas page.

CalPhotos: Arnica sororia photos.

USDA Plants: Arnica sororia information.

44 photographs:
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