According to analyses carried out by Dr Erika Maul at the Julius Kühn Institute, the white grape variety is identical to the Chelva (also Montúa) variety, which is listed as an independent variety in some sources; see there.
The white grape variety originates from Spain or Portugal. Synonyms are Carmal, Carnal, Chelva de Cebreros, Chelva de Guareña, Dependura, Diagalo, Diagalves (main name in Portugal), Diego Alves, Diogalves, Eva, Fernan Fer, Forastera Blanca, Formosa, Formosa Dourada, Formosa Portalegre, Gabriela, Guarena, Mantúa, Mantúo (2. Main name in Spain), Mantúo de Pilas, Mantúo Vigiriego, Montúa, Montúo de Villanueva, Montúo Gordo, Murecana, Pendura, Pendura Amarela, Raisin du Roi, Uva del Rey, Uva de Puerto Real, Uva Rey, Vigiriego Blanco and Villanueva.

According to DNA analyses carried out in 2020, the variety originates from a presumably natural cross between Hebén x Dedo de Dama. According to analyses carried out by Dr Erika Maul at...
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Roman Horvath MW
Domäne Wachau (Wachau)