corn mayweed

(noun) ubiquitous European annual weed with white flowers and finely divided leaves naturalized and sometimes cultivated in eastern North America; sometimes included in genus Matricaria. Synonyms: scentless camomile, scentless false camomile, scentless mayweed, scentless hayweed, corn mayweed, Tripleurospermum inodorum, Matricaria inodorum.

(noun) European white-flowered weed naturalized in North America. Synonyms: corn chamomile, field chamomile, corn mayweed, Anthemis arvensis.