This name is a synonym of Thymus pulegioides subsp. pannonicus (All.) Kerguélen.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 205072) with original publication details: Sp. Pl. 3: 141 1800.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:461400-1.
This name was in version 1 of The Plant List, record kew-205072.