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 321728) with original publication details: Gen. Iris 106 1913.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:130043-2.
This name was in version 1 of The Plant List, record kew-321728, and has not been changed.