This is Trebbiano in Italy and Ugni Blancin France. It is tremendously prolific; low in alcohol but high in acidity, it is found in almost any basic white Italian wine. It is so ingrained in Italian winemaking that it is actually a sanctioned ingredient of the blend used for (red) Chianti and Vino Nobile di Montepulciano. Most current Tuscan producers do not add it to their wines, however. The French, who also often call this grape St.-Émilion, used it for Cognac and Armagnac brandy; Ugni Blanc grapevines outnumbered Chardonnay by five to one in France during the '80s.