Hieracium auriculaeforme Hieracium bifurcum subsp. auriculiforme Hieracium xystolepium subsp. brachypodum Hieracium auriculiforme subsp. brachypodum Hieracium auriculiforme subsp. xystolepium Pilosella auriculiformis subsp. larrauriana Hieracium xystolepium Pilosella auriculiformis subsp. auriculiformis Hieracium xystolepium subsp. xystolepium Hieracium auriculiforme Pilosella fidalgoana
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024