Tripleurospermum
mayweed
1 species
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Tripleurospermum inodorumfalse chamomile, false mayweed, scentless mayweed
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Noxious weed in fields and waste ground in eastern Washington.
Origin: Introduced from Europe
Flowers: June-September
Growth Duration: annual