This name is a synonym of Alisma wahlenbergii (Holmb.) Juz..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 274724) with original publication details: Rhodora 50: 179 1948.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:8483-2.
This name was in version 1 of The Plant List, record kew-274724, and has not been changed.