These are synonyms for the grape known as Pinot Gris in France and Pinot Grigio in Italy.
Grauburgunder denotes the more food-compatible, sleeker, drier style, while the richer, fuller-bodied and more fragrant version is labeled Ruländer. The latter is named after a businessman from Speyer, Johann Ruland, who propagated it in the early 18th century.
This variety needs good vineyards with deep, heavy soil. Harvest time is usually late September and early October. It is grown primarily in Baden and the Pfalz.