Dactylorhiza xgrandis (Druce) P.F. Hunt nothosubsp. montis-mosae Kreutz, a new orchid hybrid on St. Pietersberg. This article describes a new orchid hybrid that grows in large numbers on St. Pietersberg, a limestone hill straddling the Dutch-Belgian border south of Maastricht. The hill and surrounding area are among the richest orchid sites in the Benelux. The new species is expanding rapidly but was still unnamed. In this article these plants are described as new for science.