Linked from
The 96 pages that link to Social stigma, each with the reason it gives.
Wind pollinationBroader topic: Its exposed surfaces intercept pollen arriving on the wind.
CatkinBroader topic: Female catkins often have exposed stigmas suited to intercept airborne pollen.
CarpelBroader topic: It captures pollen at the upper end of the carpel.
PollinatorBroader topic: Pollen carried by an animal must reach a stigma for pollination to occur.
SaffronBroader topic: Each saffron thread is a dried stigma from a Crocus sativus flower.