'scentless hayweed' definitions:

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, corn mayweed, Tripleurospermum inodorum, Matricaria inodorum]