The white grape variety originates from France. Synonyms are Bordeleza Zuria, Chacolí Zuria, Courbeau, Courbi, Courbis Blanc, Courbu, Courbut Blanc, Courtoisie, Hondarribi Zuri and Vieux Pacherenc. It should not be confused with the varieties Arrufiac, Crouchen, Noah or Petit Courbu, despite seemingly suggestive synonyms or morphological similarities. According to DNA analyses carried out in 1999, the opinion held by the French ampelographer Pierre Galet (1921-2019) that Courbu Blanc and Courbu Noir are colour mutations of the same variety has been refuted. In the Spanish Basque Country, the three varieties grown in mixed sets, Courbu Blanc, Crouchen and Noah, are called Hondarribi Zuri; see under Hondarribi Beltza. This medium-maturing, high-yielding vine has extremely small berries. It is susceptible to botrytis and both powdery mildews. The variety produces strong white wines with a lemon flavour. It was already threatened with extinction and was successfully revived. Courbu Blanc is authorised in south-western France in the areas of Béarn, Irouléguy, Jurançon and Pacherenc du Vic-Bilh. The area under cultivation in 2016 totalled 32 hectares (Kym Anderson).