Common Tansy
Tanacetum vulgare

Family: Sunflower (Asteraceae)
AKA: Bitter Buttons, Cow Bitter, Mugwort, Golden Buttons
Photo taken on: September 4, 2005
Location: Lower Loop, Crested Butte, CO
Life Zones: Plains to montane
Habitat: Moist disturbed soil

Grows to 3 feet tall in masses. It is a robust plant with dissected, aromatic, fern-like leaves. Button-like flower heads about 1/4" across grow in a flat tight cluster. There are no ray petals, only disc flowers.

Flora of North America reference.

NOXIOUS