This name is a synonym of Hesperis matronalis subsp. candida (Kit.) Hegi & Em.Schmid.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Verh. K. K. Zool.-Bot. Ges. Wien 16: 143 1866.
This name was in version 1 of The Plant List, record kew-2847379, and has not been changed.