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.

Synonyms:
Achillea borealis Bong.
Achillea lanulosa Nutt. var. eradiata (Piper) M. Peck
Achillea lanulosa Nutt. var. lanulosa
Achillea millefolium L. ssp. lanulosa (Nutt.) Piper
Achillea millefolium L. var. alpicola (Rydb.) Garrett
Achillea millefolium L. var. borealis (Bong.) Farwell
Achillea millefolium L. var. californica (Pollard) Jeps.
Achillea millefolium L. var. lanulosa (Nutt.) Piper
Achillea millefolium L. var. litoralis Ehrend. 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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