The red grape variety originates from Portugal. Synonyms are Grossa, Tinta Grossa and Tinta Grossa d'Alentejo. According to DNA analyses carried out in 2020, it originates from a presumably natural cross between Hebén x Alfrocheiro. However, this is based on only 20 DNA markers (see molecular genetics). It should not be confused with the Grossa, Marufo or Tinta Barroca varieties (all with the synonym Tinta Grossa) due to morphological similarities or, in some cases, the same synonyms. Nothing is known about a possible genetic link to the white variety Carrega Branco. A direct descendant is the Preto Martinho variety. The variety is cultivated in the Trás-os-Montes area. In 2016, 17 hectares of vineyards were designated (Kym Anderson).
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