This name is a synonym of Hesperis matronalis subsp. nivea Kulcz..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 100361507) with original publication details: Verh. Naturf. Ver. in Brünn 15(2): 81. 1877.
This name was in version 1 of The Plant List, record tro-100361507, and has not been changed.