This name is a synonym of Xanthium strumarium subsp. sibiricum (Patrin ex Widder) Greuter.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record A87EDAAF-C765-4E6B-AC9A-11336482C378) with original publication details: 32 1923.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:260888-1.
This name was in version 1 of The Plant List, record gcc-9198.