There are two grape varieties with this name:
The red grape variety is a new breeding between Chatus (Nebbiolo di Dronero) x Dolcetto. Synonyms are Dalmasso 7-21, Incrocio Dalmasso VII/21 and S. Martino. According to DNA analyses carried out in 2009, the breeding list entry Nebbiolo x Dolcetto was wrong. The cross was made in 1936 in Conegliano (Veneto) by the breeder Giovanni Dalmasso (1886-1974). Incidentally, the same parents also produced the new varieties Passau and Valentino Nero. The variety is cultivated in Piedmont. In 2016, 6 hectares of vines were reported with a falling trend (Kym Anderson).
This white grape variety is a new cross between Pirovano 57 (Bicane x Poete Matabon) x Zibibbo (Muscat d'Alexandrie). Synonyms are Pirovano 215 and S. Martino. The cross was made in Rome in 1923 by the breeder Alberto Piròvano (1884-1973). The variety is used as a winepress and table grape. No stock was recorded in 2016 (Kym Anderson).
Images: M.I.P.A.F - National Vine Certification Service
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