Orchis curtisii Orchis ruthei Orchis variabilis Dactylorchis ruthei Dactylorhiza ruthei Dactylorhiza pomeranica Dactylorhiza majalis subsp. ruthei Dactylorhiza kerneri subsp. variablis Dactylorhiza variabilis
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024