Welschriesling is a genetic offspring of riesling.
Despite the word riesling in its name, the central European grape welschriesling (pronounced: WELSH-rees-ling) is not directly related to the noble German variety at all. Nor are olaszrizling (Hungary), riesling italico (Friuli, Italy) or cape riesling (South Africa). While it’s not riesling, welschriesling is used to make delicious late-harvest, botrytized wines, especially in the Burgenland region of Austria. BTW, true riesling is considered by many—possibly even most—wine experts to be the most noble and unique white grape variety in the world.