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.
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.
Mayweed chamomile is found in heavily disturbed places, such as roadsides, fields, and waste areas.
A native of Europe, Mayweed chamomile is now found widespread throughout North America.
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.
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