Page authors: Don Knoke, David Giblin
Achillea ptarmica
pearl yarrow

Distribution: Reported from Washington but no specimens seen; Alaska to Oregon, east in scattered locations across North America to the Atlantic Coast.

Habitat: Roadsides, wastelots, and other disturbed open areas where occasinally escaping from cultivation.

Flowers: May-August

Origin: Introduced from Eurasia

Growth Duration: Annual, Perennial

Conservation Status: Not of concern

Pollination: Bees, flies, beetles, wasps


Non-aromatic perennial, 3-10 dm. tall, short-hairy throughout.


Leaves linear, finely serrate, green, sessile and clasping.


Inflorescence open, of several small umbels terminating the branches; involucral bracts imbricate in several series, dry, the margins translucent; rays short, white; disc flowers creamy-white; receptacle convex, chaffy throughout; pappus none.


Achenes compressed parallel to the involucral bracts.

Accepted Name:
Achillea ptarmica L.
Publication: Sp. Pl. 2: 898. 1753.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Achillea ptarmica in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Achillea ptarmica checklist entry.

OregonFlora: Achillea ptarmica information.

E-Flora BC: Achillea ptarmica atlas page.

CalPhotos: Achillea ptarmica photos.

USDA Plants: Achillea ptarmica information.

4 photographs:
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