It is a varietal and three vineyards in San Benito County claim they are growing the grape. Evidently, Wiliam Pheffer crossed a cab and trousseau grape in the mid to late 1860s in the Los Altos Hills area in California. Kind of obscure/rare, Kenneth Volk of Kenneth Volk Vineyards, Santa Maria, CA--formerly of Wildhorse fame has done just that. Very interesting, spicey, delicious cab. More later. Gary