The red grape variety comes from Portugal. Synonyms are Amaral Preto, Azal Tinto, Azar, Cachón, Cainho Miúdo, Caíño Bravo, Cainzinho and Sousão. Although synonyms or morphological similarities seem to indicate this, it should not be confused with the varieties Azal Branco, Borraçal, Melhorio, Sousão Galego, Touriga Nacional, Tinta Castañal or Vinhão (with the latter two there is a parent-offspring relationship). The parentage (parenthood) is unknown. According to DNA analyses carried out in 2013, she is a parent of the Caíño Blanco and Loureiro varieties. The late maturing, rather low-yielding vine is often grown on pergolas. It produces a colourful, acidic and powerful red wine, which is mostly used for blends. The variety is grown in the regions of Douro, Beira Interior and Rios do Minho or Vinho Verde. In 2010, the area under cultivation decreased to 92 hectares (Kym Anderson).
Source: Wine Grapes / J. Robinson, J. Harding, J. Vouillamoz / Penguin Books Ltd. 2012