Vascular Plants - Asteraceae - Artemisia:
Artemisia biennis
Page Authors: Don Knoke, David Giblin
biennial wormwood 
Blooms: August - October
Habit: herb
Duration: annual,biennial
Origin: Native
Conservation Status: Abundant; of no concern.

Distribution: Native in the Pacific Northwest, but widely distributed elsewhere as a weed.
Habitat: Waste places and streambanks, especially in sandy soil.
Species Description:

General: Coarse, nearly inodorous, glabrous, taprooted annual or biennial, 0.3-3 m. tall.
Leaves: 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.
Flowers: 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.
Fruits: Achenes glabrous.
Accepted Name:
Artemisia biennis Willd.
Synonyms:
Artemisia biennis Willd. var. biennis

Treated in Flora of the PNW as:
Artemisia biennis
Additional Resources:

PNW Herbaria Specimens: View list of all Artemisia biennis specimens in the Consortium of Pacific Northwest Herbaria database.

WTU Herbarium Specimens: View list of Artemisia biennis specimens in the WTU Herbarium database.

Washington Flora Checklist: Artemisia biennis treatment.

E-Flora BC: Artemisia biennis atlas page.

CalPhotos: Artemisia biennis images.

USDA Plants Database: Artemisia biennis.
Additional photographs of Artemisia biennis:
(click on a thumbnail to view larger photo)

Richard Old

Richard Old

Richard Old

Richard Old

Richard Old

Richard Old

Richard Old
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Washington Native Plant Society
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