Synonym or breeding number (also FR 364-80 R) for the grape variety Piroso; see there.
The red grape variety (also Freiburg 364-80 R) is a new breeding between GM 6423-14 (Rotberger x Heroldrebe) x Freiburg 054-64 r (Deckrot x Freiburg 589-54). It contains genes from Vitis berlandieri, Vitis labrusca, Vitis Vitis...
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Roman Horvath MW
Domäne Wachau (Wachau)