Confusing part of names or synonyms of (most likely) independent grape varieties; most of them in northern Italy. With a few exceptions they are red wine varieties. Individual kinship relations cannot be excluded, but are not known:
In Lombardy there is the DOC area Bonarda dell'Oltrepò Pavese with red wine from Croatina (Bonarda).
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Serious sources on the internet are rare - and Wine lexicon from wein.plus is one such source. When researching for my articles, I regularly consult the wein.plus encyclopaedia. There I get reliable and detailed information.
Thomas Götz
Weinberater, Weinblogger und Journalist; Schwendi