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 309013) with original publication details: Bot. Tidsskr. II, 1: 204 1872.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:603591-1.
This name was in version 1 of The Plant List, record kew-309013.