Linked from
The 8 pages that link to Pappus, each with the reason it gives.
AcheneBroader topic: On dandelion achenes, the pappus increases drag and enables wind dispersal.
Wind dispersalBroader topic: Dandelion pappi increase drag and help propagules remain airborne.
AsteralesBroader topic: In many Asterales, this structure aids fruit dispersal by wind or animals.
TaraxacumBroader topic: Its feathery pappus helps carry Taraxacum fruits through the air.
CirsiumBroader topic: Cirsium fruits commonly carry a feathery pappus that aids dispersal.
SonchusBroader topic: Its fine hairs help disperse Sonchus achenes by wind.