Page authors: Don Knoke, David Giblin
Ionactis stenomeres
Rocky Mountain ankle-aster, Rocky Mountain aster

Distribution: Occurring east of the Cascades crest in northeastern Washington; southeastern British Columbia to northeastern Washington, east to Idaho and Montana.

Habitat: Open hillsides and forest openings, from to fairly high elevations in the mountains.

Flowers: June-September

Origin: Native

Conservation Status: Not of concern


Perennial from a branching crown, fibrous-rooted, the several stems erect or ascending, 1.5-3 dm. tall.


Leaves crowded, scabrous, sessile, 1-nerved, 15-40 mm. long and 1-4 mm. wide, tipped with a short spine.


Heads solitary, top-shaped, the disk 12-25 mm. wide; rays about 13, 12-20 mm. long, blue to violet; involucre 9-14 mm. high, its bracts imbricate, glandular-hairy; pappus of capillary bristles, double, the outer 1 mm. long.


Achenes silky.

Accepted Name:
Ionactis stenomeres (A. Gray) Greene
Publication: Pittonia. 3: 246. 1897.

Synonyms & Misapplications:
Aster stenomeres A. Gray [HC]
Additional Resources:

PNW Herbaria: Specimen records of Ionactis stenomeres in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Ionactis stenomeres checklist entry.

E-Flora BC: Ionactis stenomeres atlas page.

CalPhotos: Ionactis stenomeres photos.

USDA Plants: Ionactis stenomeres information.

12 photographs:
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