Wagenitz & Greuter (Boiss.) 2003 - Greuter W (2003) The Euro+Med treatment of Cardueae (Compositae) — generic concepts and required new names. Willdenowia 33: 49-61. doi: 10.3372/wi.33.33104.
There is no corrections for Centaurea drabifolia subsp. floccosa yet.