What is "regner"

Regner is a white German wine grape variety that is a crossing of the table grape Seidentraube (also known as Luglienga bianca) the Vitis vinifera red grape variety Gamay. The variety was developed in 1929 and by 1990 there was almost 420 acres (170 hectares) of Regner planted in Germany, mostly in the Rheinhessen. By the late 20th century, wine growers in England were also experimenting with the variety.