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|Noun||1.||scentless hayweed - ubiquitous European annual weed with white flowers and finely divided leaves naturalized and sometimes cultivated in eastern North America; sometimes included in genus Matricaria|
corn mayweed, Matricaria inodorum, scentless camomile, scentless false camomile, scentless mayweed, Tripleurospermum inodorum
genus Tripleurospermum, Tripleurospermum - small genus comprising plants often included in genus Matricaria