This name is a synonym of Hieracium lachenalii subsp. argillaceum (Jord.) Zahn.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 48CEE2E9-6038-4B23-AFF5-9A21753510F0) with original publication details: 17 1849.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:214957-1.
This name was in version 1 of The Plant List, record gcc-100223.