Page authors: Don Knoke, David Giblin
Achillea millefolium
milfoil, yarrow
WTU specimens
Other herbaria

Distribution: Both sides of the Cascades in Washington, from the coast to the alpine; circumboreal; widespread throughout North America.

Habitat: Common in open, dry to somewhat moist areas from low to high elevations; tolerant of disturbance.

Flowers: April-October

Origin: Both native and introduced populations

Conservation Status: Not of concern

Description:
General:

Aromatic perennial from a rhizome, 1-10 dm. tall.

Leaves:

Leaves narrow, tri-pinnate, the ultimate segments linear and short.

Flowers:

Heads numerous, small, in a flat-topped inflorescence; involucral bracts imbricate in several series, dry, the margins translucent; rays 3-12, 2-3 mm. long and wide, white or occasionally light pink; disk flowers 10-75, pale yellow, perfect and fertile; receptacle convex, chaffy throughout; pappus none.

Fruits:

Achenes compressed parallel to the involucral bracts.

Accepted Name:
Achillea millefolium L.
Publication: Sp. Pl. 2: 899. 1753. 1753.

Synonyms:
Achillea borealis Bong.
Achillea lanulosa Nutt. var. eradiata (Piper) M. Peck
Achillea lanulosa Nutt. var. lanulosa
Achillea millefolium L. ssp. lanulosa (Nutt.) Piper [HC]
Achillea millefolium L. var. alpicola (Rydb.) Garrett [HC]
Achillea millefolium L. var. borealis (Bong.) Farw.
Achillea millefolium L. var. californica (Pollard) Jeps. [HC]
Achillea millefolium L. var. lanulosa (Nutt.) Piper [HC]
Achillea millefolium L. var. litoralis Ehrendorfer ex Nobs
Achillea millefolium L. var. millefolium
Achillea millefolium L. var. occidentalis DC.
Achillea millefolium L. var. pacifica (Rydb.) G.N. Jones
Additional Resources:

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

WA Flora Checklist: Achillea millefolium checklist entry.

E-Flora BC: Achillea millefolium atlas page.

CalPhotos: Achillea millefolium photos.

USDA Plants: Achillea millefolium information.

78 photographs:
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