What is "corn mayweed"

n. ubiquitous European annual weed with white flowers and finely divided leaves naturalized and sometimes cultivated in eastern North America; sometimes included in genus Matricaria [syn: scentless camomile, scentless false camomile, scentless mayweed, scentless hayweed, Tripleurospermum inodorum, Matricaria inodorum]

European white-flowered weed naturalized in North America [syn: corn chamomile, field chamomile, Anthemis arvensis]