A damned or damn yellow composite (DYC) is a jocular reference to the difficulty of distinguishing many of the numerous species of composite (family Asteraceae) that have yellow flowers and can be difficult to tell apart in the field.[1][2] It is sometimes reserved for those yellow composites of no particular interest.[1] Notable individuals who referred to these difficult yellow composites as "DYCs" include Oliver Sacks[3] and Lady Bird Johnson.[4] The term is also applied (by replacing the color name) to white flowers.