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 309130) with original publication details: Nova Acta Regiae Soc. Sci. Upsal. 8: 254 1821.
This name was in version 1 of The Plant List, record kew-309130.