This name is a synonym of Verbascum thapsus subsp. giganteum (Willk.) Nyman.
The record derives from WCSP (in review)
(data supplied on 2012-03-26)
which reports it as a synonym with original publication details: Linnaea 25: 51 1852.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:769864-1.
This name was in version 1 of The Plant List, record kew-2455046.