This name is a synonym of Zannichellia palustris subsp. pedicellata (Wahlenb. & Rosén) Hook.f..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 309001) with original publication details: Sp. Pl. 4: 181 1805.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:603578-1.
This name was in version 1 of The Plant List, record kew-309001.