Page authors: Don Knoke, David Giblin
Artemisia biennis
biennial wormwood

Distribution: Occurring on both sides of the Cascades crest and in the Columbia River Gorge in Washington; Alaska to California, east across most of North America to the Atlantic Coast, where considered introduced.

Habitat: Roadsides, fields, irrigation ditches, streambanks, and other disturbed open areas, especially in sandy soil.

Flowers: August-October

Origin: Native

Growth Duration: Annual, Biennial

Conservation Status: Not of concern


Coarse, nearly inodorous, glabrous, taprooted annual or biennial, 0.3-3 m. tall.


Leaves 5-15 cm. long, green, pinnately divided nearly to the midrib into several narrow lobes which are again sharply toothed, or the lower bipinnatifid.


Inflorescence dense, spike-like or of short, spike-like branches; heads numerous, crowded, nearly sessile; involucre 2-3 mm. high; corollas all tubular, yellowish, all fertile, the outer pistillate; receptacle naked; pappus none.


Achenes glabrous.

Accepted Name:
Artemisia biennis Willd.
Publication: Phytographia. 11. 1794.

Synonyms & Misapplications:
Artemisia biennis Willd. var. biennis
Additional Resources:

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

WA Flora Checklist: Artemisia biennis checklist entry.

OregonFlora: Artemisia biennis information.

E-Flora BC: Artemisia biennis atlas page.

CalPhotos: Artemisia biennis photos.

USDA Plants: Artemisia biennis information.

12 photographs:
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