Mayweed is also called stinking chamomile, and deserves that epithet more than mayweed. It often blooms later than May. But of course it may show up almost anywhere, along roads and in other weedy situations. It has been used to treat a variety of ailments, as a rodent and flea repellant, and as a source of yellow dye. The flower heads are about 3/4 inch across. It was an early immigrant to the New Europes (why do I like that name?) and is now found in every state, and in all of Canada except LB, NT, and NU. Beal Gardens, in the weed section, MSU, 7/1/17.