Artemisia biennis (Biennial Wormwood)
Family: Asteraceae (Sunflower)

Biennial Wormwood looks like a spike with sharply toothed pinnately lobed leaves sticking out. Leaves are hairless. Stems are solitary. Clusters of flowers develop close to the stem. It is usually found in disturbed areas. Biennial Wormwood is native to northwestern states but introduced in Colorado.

Vegetation zone:  Plains, Foothills
Time of bloom:  August - October
Origin:  Introduced
Eastern Colorado Wildflowers