WordNet sense 1 (ubiquitous European annual weed with white flowers and finely divided leaves naturalized and sometimes cultivated in eastern North America; sometimes included in genus Matricaria):

scentless camomile, Matricaria inodorum, scentless false camomile, scentless hayweed, scentless mayweed, Tripleurospermum inodorum

WordNet sense 2 (European white-flowered weed naturalized in North America):

corn chamomile, Anthemis arvensis, field chamomile