If you see a road side plant topped with a cluster of golden buttons, then, likely, you would be looking at the tansy. The flowers of the tansy look like daisies, minus the adorning white rays. The leaves are fern like and have a strong scent. "The strong odor, finely divided leaves, and button-like yellow rayless flower heads are distinctive." (Roland.)
"Tansy was supposed to be capable of expelling intestinal worms and of stimulating the appetite. A solution was made from boiling the leaves to use in treating sprains and tired muscles. The plant has also been used as a savoury, in tansy tea, and for making tansy wine." (Griffin.) One will see the tansy in July and in August.