About Hieracium murorum subsp. sylvularum (Jord. ex Boreau) Zahn
Hieracium murorum, commonly called wall hawkweed, is a flowering plant species that belongs to the family Asteraceae. This species is native to Europe, and has become naturalized in some of the colder regions of North America. The scientific name of the subspecies discussed here is Hieracium murorum subsp. sylvularum (Jord. ex Boreau) Zahn.