Common fleabane (Pulicaria dysentirica)

 

Collins, 248; Readers Digest, 331

This medium height hairy perennial has very pretty yellow flower heads which are like daisies but yellow.  It flowers from July to September and prefers dark damp grassy places. For a long while the leaves of Fleabane, when dried and burned, were said to give off a vapour which drove fleas away, hence the name.  The flower head is very popular with insects and butterflies.