[Chamomiles and Fennels: The Genus Anthemis East of the Cascade Mountains of Oregon and Washington]

Dog Fennel, Mayweed Chamomile, Stinking Chamomile

Anthemis cotula

Flower head of Mayweed Chamomile, Stinking Chamomile, Dog Fennel: Anthemis cotula

The photo above shows a close-up of the flower head of mayweed chamomile. Photographed on the trail along the westbank of Catherine Creek in the central Columbia River Gorge.........July 7, 2006.

Characteristics:

Mayweed chamomile is a bushy, branched annual with a foul smell. As a plant, it is fairly attractive, but it spreads readily to become a pesky weed. Plants range from 10-60 cm tall The twice to three-times pinnatifid leaves are 2-6 cm in length, with very narrow leaflets.

The flower heads are numerous, being found at the ends of the branches as well as in the leaf axils. The yellow disks are mostly 5-10 mm wide, surrounded by 10-20 white rays which range from 5-11 mm long. The involucre is sparsely hairy.


Habitat:

Mayweed chamomile is found in heavily disturbed places, such as roadsides, fields, and waste areas.


Range:

A native of Europe, Mayweed chamomile is now found widespread throughout North America.


Importance:

Contact with mayweed may cause skin rashes, blistering of livestock noses and mouths, and an irritation to the mucous membranes of grazing livestock. It has also been known to give a strong flavor to the milk of dairy cattle and goats.


Mayweed Chamomile, Stinking Chamomile, Dog Fennel: Anthemis cotula

The photo above shows a close-up of the appearance of mayweed chamomile as seen on the graveled trail along the western edge of Catherine Creek........July 7, 2006. Note the pinnately dissected leaves common to this genus.

Flower head of Mayweed Chamomile, Stinking Chamomile, Dog Fennel: Anthemis cotula - Involucral bracts of Mayweed Chamomile, Stinking Chamomile, Dog Fennel: Anthemis cotula - Stem leaf of Mayweed Chamomile, Stinking Chamomile, Dog Fennel: Anthemis cotula - Mayweed Chamomile, Stinking Chamomile, Dog Fennel: Anthemis cotula

Close-up details of dog fennel as seen on Wedge Mt., Wenatchee National Forest........June 8, 2009.

Paul Slichter