This name is a synonym of Verbascum blattaria f. albiflora (G. Don) House.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50326583) with original publication details: Gen. Hist. 4: 497 1838.
This name was in version 1 of The Plant List, record tro-50326583, and has not been changed.