Misorthography. From John manning: Gladiolus jonquilodorus was published first, however according to the Rules of Nomenclature, later grammatical "corrections" to G. jonquilliodorus are not accepted. G. jonquilodorus therefore maintains priority in line with POWO: https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:437550-1

See flag here:
https://www.inaturalist.org/flags/603852

And comments here: https://www.inaturalist.org/observations/146890767