Hieracium atratum subsp. squalidiforme
Synonymy
Source: Greuter, W. (2006+): Compositae (pro parte majore). – In: Greuter, W. & Raab-Straube, E. von (ed.): Compositae. Euro+Med Plantbase - the information resource for Euro-Mediterranean plant diversity.
Hieracium atratum subsp. squalidiforme in Reichenbach, Icon. Fl. Germ. Helv. 19(2): 187. 1909