This name is a synonym of Iris lacustris Nutt..
The record derives from iPlants
(data supplied on 2012-03-23)
which reports it as a synonym (record 321729) with original publication details: Trans. Wisconsin Acad. Sci. 54: 322 1965.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:130042-2.
This name was in version 1 of The Plant List, record kew-321729, and has not been changed.