Hieracium subramosum subsp. semiconstringens Hieracium subramosum subsp. praetextum Hieracium constringens var. spachnoum Hieracium constringens var. malmeanum Hieracium caesium var. alpestre Hieracium gravastellum Hieracium caesium subsp. gravastellum Hieracium vulgatum subsp. constrictum Hieracium subramosum subsp. constringens Hieracium constringens var. alpestre
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024