Mayweed is a common name for two different species of flowering plants and also a name commonly used for several genera of the tribe Anthemideae whose species are currently in a flux of renaming:
Species with a common name of Mayweed:
Anthemis cotula Anthemis arvensis Oncosiphon suffruticosumGenera commonly called Mayweed:
Matricaria TripleurospermumReferences
Mayweed Wikipedia(Text) CC BY-SA