This name is a synonym of Gladiolus quadrangulus (D.Delaroche) Barnard.
The record derives from iPlants
(data supplied on 2012-03-23)
which reports it as a synonym and as a spelling variant (record 322893) with original publication details: Fl. Indica Prodr. Fl. Cap.: 1 1768.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:439558-1.
This name was in version 1 of The Plant List, record kew-322893, and has not been changed.