The Colombard reference article from the English Wikipedia on 24-Apr-2004
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Colombard

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Colombard is a variety of grape, better known as French Colombard in North America. Old vine grapes are crushed by some northern Californian producers and made into a fruity white wine of interesting character in both dry and sweet versions. This grape is mainly grown in California to provide backbone, due to its natural acidic character, for white "jug" wine blends. It is still grown in South West France where it is used for white wine blends in certain Bordeaux and Gascony AOC's and is also used for distilling into brandy. It is also widely grown in South Africa.