Biancone di Portoferraio is a white Italian wine grape variety that is grown almost exclusively on the island of Elba off the coast of Tuscany.
[1] While Biancone di Portoferraio is today found almost exclusively on the Italian island of Elba, ampelographers suspect that the grape may have Corsican origins with DNA analysis in the early 21st century revealing that the grape has a potential parent-offspring relationship with the Corsican wine grape Biancu Gentile (Biancone).
Further analysis revealed the red Tuscan wine grape Mammolo as another potential parent and listed the Italian grape varieties of Caloria, Colombana nera and Pollera nera as potential half-siblings.
[1] While some plantings of Biancone di Portoferraio may have previously existed on Corsica, where the grape was known as Biancone and Uva bianca, today the grape is found almost exclusively on the island of Elba located in the Tyrrhenian Sea between Corsica and the Tuscan coast.
[1] Over the years, Biancone di Portoferraio has been known under a variety of synonyms including: Biancona, Biancone (in Corsica), Biancone blanc, Corcesco, Folle Verte d'Oleron, Pagadebiti di Porto S. Stefano, Pagadebiti di Porto San Stefano and Uva bianca.