Damned yellow composite
A damned or damn yellow composite is any of the numerous species of composite flowers that have yellow flowers and can be difficult to tell apart in the field. It is a jocular term, and sometimes reserved for those yellow composites of no particular interest. Notable individuals who referred to these flowers as "DYCs" include Oliver Sacks and Lady Bird Johnson. The U.S. National Park Service provides information to help visitors identify "Darn Yellow Composites".