Hieracium scholanderi Hieracium vulgatum Hieracium lachenalii Hieracium cruentifolium Hieracium amitsokense Hieracium vulgatiforme Hieracium vulgatum subsp. cruentifolium Hieracium plicatum subsp. amitsokense
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024