Microsatellite analysis shows that vines described as Petite Sirah by their estates are really from a number of different clonal varieties: Pelousin and Durif (both French grapes), and a third that is at present unidentified.

ECONOMIST: Secrets of the Cabernet

Though it's recently been named a clonal cousin of Vermentino a far more famous grape a good Pigato from a top producer like Bruna or Terre Bianche can be even more nuanced, with aromas of almonds and citrus.

WSJ: The Unique Charms of 'Miscellaneous Wines' | On Wine by Lettie Teague