Hieracium billyanum de Retz in Bull. Soc. Bot. France 121: 44. 1974
Hieracium billyanum in Bull. Soc. Bot. France 121: 44. 1974
is basionym for Pilosella billyana, Cat. Fl. Prov. Teruel: 140. 1990
Hieracium billyanum in Bull. Soc. Bot. France 121: 44. 1974