This name is a synonym of Carduus defloratus subsp. summanus (Pollini) Arcang..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 2E295852-0E01-4587-8DB0-9E5CA1825216) with original publication details: 838 1809.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:188565-1.
This name was in version 1 of The Plant List, record gcc-102132.