Page authors: Don Knoke, David Giblin
Artemisia tilesii
Aleutian mugwort, Cascade wormwood

Distribution: Occurring in the Olympic and Cascade Mountains of Washington; Alaska to Oregon, east to Montana, and east across Canada to Quebec.

Habitat: Open rocky or gravelly, wet or dry sites, from middle elevations to the alpine, descending to sea level northward.

Flowers: July-September

Origin: Native

Conservation Status: Not of concern


Herbaceous, rhizomatous perennial, the stems 3-15 dm. tall.


Leaves highly variable, chiefly cauline, from entire to deeply lobed, the lobes pointing forward, the lobes again cut; leaves tomentose beneath and green and shining above.


Inflorescence a narrow panicle; heads relatively large and broad, the involucre 3-5 mm. high and 4-8 mm. wide, the bracts sometimes with dark margins; corollas all tubular, the outer 8-15 pistillate; disk flowers 20-40; pappus none; receptacle without hairs.



Accepted Name:
Artemisia tilesii Ledeb.
Publication: Mém. Acad. Imp. Sci. St. Pétersbourg Hist. Acad. 5: 568. 1814.

Synonyms & Misapplications:
Artemisia elatior (Torr. & A. Gray) Rydb.
Artemisia hookeriana Besser
Artemisia tilesii Ledeb. ssp. elatior (Torr. & A. Gray) Hultén
Artemisia tilesii Ledeb. ssp. unalaschcensis (Besser) Hultén
Artemisia tilesii Ledeb. var. elatior Torr. & A. Gray
Artemisia tilesii Ledeb. var. unalaschcensis Besser [HC]
Additional Resources:

PNW Herbaria: Specimen records of Artemisia tilesii in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Artemisia tilesii checklist entry.

E-Flora BC: Artemisia tilesii atlas page.

CalPhotos: Artemisia tilesii photos.

USDA Plants: Artemisia tilesii information.

7 photographs:
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