pappus

A modified calyx made up of a ring of fine hairs, scales, or teeth that persist after fertilization and aid the wind dispersal of the fruit, often by forming a parachute-like structure. It is seen in members of the Compositae, e.g. dandelions (Taraxacum) and thistles (Carduus). The pappuses of an inflorescence may form a 'clock'.