1.  corn mayweed(n = noun.plant) matricaria inodorum, scentless camomile, scentless false camomile, scentless hayweed, scentless mayweed, tripleurospermum inodorum - ubiquitous European annual weed with white flowers and finely divided leaves naturalized and sometimes cultivated in eastern North America; sometimes included in genus Matricaria;
is a kind of herb, herbaceous plant
is a member of genus tripleurospermum, tripleurospermum

2.  corn mayweed(n = noun.plant) anthemis arvensis, corn chamomile, field chamomile - European white-flowered weed naturalized in North America;
is a kind of composite, composite plant
is a member of anthemis, genus anthemis

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