This name is a synonym of Dontostemon integrifolius (L.) C.A. Mey..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 4105679) with original publication details: Syn. Pl. 2: 203 1807.
This name record (from Tropicos) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Hesperis glandulosus in version 1 of The Plant List.