Variety with an oval bean and a black and white skin; the two colors cover the bean symmetrically. In the past, this bean variety probably had a broad distribution area, while today it is widespread only in the southern area of the Park. It is very known also for its characteristic color (black and white): the name derives from this particular feature and recalls the contrast that has always characterized the relationship between mothers-in-law and daughters-in law (socere and nore).