Do flowering plants form seeds even if they are not fertilized?

If so, is there a way to tell if they are fertile or not?

Do flowering plants form seeds even if they are not fertilized?
Some species can. This is called "apomixis", and they may be fertile -- examples include dandelion (Taraxacum), hawkweeds (Hieracium), brambles (Rubus) and others.
Reply:No, a flower must be fertilized for a seed to form.

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