Dureza is a dark-skinned grape

Grape

A grape is a non-climacteric fruit, specifically a berry, that grows on the perennial and deciduous woody vines of the genus Vitis. Grapes can be eaten raw or they can be used for making jam, juice, jelly, vinegar, wine, grape seed extracts, raisins, molasses and grape seed oil. Grapes are also...

 variety from the Ardèche

Ardèche

Ardèche is a department in south-central France named after the Ardèche River.- History :The area has been inhabited by humans at least since the Upper Paleolithic, as attested by the famous cave paintings at Chauvet Pont d'Arc. The plateau of the Ardeche River has extensive standing stones ,...

 region in France

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

. It has been used for production of red wine

Wine

Wine is an alcoholic beverage, made of fermented fruit juice, usually from grapes. The natural chemical balance of grapes lets them ferment without the addition of sugars, acids, enzymes, or other nutrients. Grape wine is produced by fermenting crushed grapes using various types of yeast. Yeast...

, but is hardly grown any more; it is not part of the list of the allowed grape varieties of any French wine appellation

Appellation

An appellation is a legally defined and protected geographical indication used to identify where the grapes for a wine were grown; other types of food often have appellations as well...

, and in 1988 only 1 hectare

Hectare

The hectare is a metric unit of area defined as 10,000 square metres , and primarily used in the measurement of land. In 1795, when the metric system was introduced, the are was defined as being 100 square metres and the hectare was thus 100 ares or 1/100 km2...

 of Dureza remained, while there were 11 ha in the late 1970s.

Dureza has sometimes been confused with Durif

Durif

Durif is a variety of red wine grape primarily grown in California, Australia, France, and Israel. Since the end of the 20th century, wineries located in Washington's Yakima River Valley, Maryland, Arizona, West Virginia, Chile, Mexico's Baja Peninsula, and Ontario's Niagara Peninsula have also...

, Peloursin

Peloursin

Peloursin is wine grape best known for its crossing with Syrah to make the red wine grape Durif.The grape is believed to have originated in Isère from the northern Rhône-Alpes region. Today it can be found in some quantities in California and Victoria, Australia....

 and Syrah.

DNA typing has established that Dureza is the father of the Syrah grape, with Mondeuse Blanche

Mondeuse Blanche

Mondeuse Blanche is a variety of white grape almost exclusively found in and around the Savoy wine region in France. With just of plantations in 1999, it leads a dwindling existence and is used primarily in the VDQS wine Bugey and the AOC Vin de Savoie.- Related grapes :DNA typing has established...

being the mother.