This name is a synonym of Xanthium orientale subsp. italicum (Moretti) Greuter.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record AEEA0C6C-CED5-4938-A00E-4773B8F4A92B) with original publication details: 357 1849.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:260823-1.
This name was in version 1 of The Plant List, record gcc-38512.