A bergamot orange from Calabria, Italy
Bergamot orange is a citrus fruit, Latin name Citrus bergamia - which is commercially grown in Calabria, Italy. Among other uses it is used to flavour Earl Grey tea and Lady Grey tea.
Some people have a reaction to bergamot, key chemicals in which can have an impact on certain drugs, as well having medical uses.
For a more comprehensive treatment, see the article on 
Wikipedia.