This name is a synonym of Alyssum montanum subsp. gmelinii (Jord.) Hegi & Em.Schmid.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 100361821) with original publication details: Repert. Spec. Nov. Regni Veg. Beih. 30(1): 435. 1925.
This name was in version 1 of The Plant List, record tro-100361821.