The variety mazuelo, also known as cariñena in Aragón and samsó in Catalonia, is one of the first grape varieties documented in Spain. It is a vinifera with high acidity, producing wines with abundant tannins, full body, and elevated acidity. It is more productive than other red varieties. Its clusters are large, compact, and have very short stalks. It tends to ripen late and is quite tolerant to drought.
In Rioja, mazuelo is one of the common varieties in traditional blends, where it is used as a complement to add acidity to tempranillo, especially in wines intended for long aging. However, in the D.O.Ca. Rioja, it barely represents 3% of the total vineyard area. Although it is not commonly made as a single varietal, some wineries such as Beronia or Vivanco have released monovarietal wines with this grape.
Typical of the Aragonese region of Cariñena, it is also gaining prominence in Catalan regions such as Priorat.