Centaurea dertosensis Costa accepted as Centaurea podospermifolia Loscos & Pardo (original description)
Centaurea montana Costa (original description)
Centaurea ochrolopha Costa accepted as Centaurea leucophaea subsp. ochrolopha (Costa) Dostál (original description)
Crepis balearica (Costa) Costa accepted as Crepis triasii Nyman accepted as Crepis triasii (Cambess.) Fr. (original description)
Hieracium boreale Costa (original description)
Hieracium cordatum Scheele ex Costa (original description)
Hieracium cuspidatum Scheele ex Costa accepted as Hieracium glaucophyllum subsp. cuspidifrons Zahn (original description)