This name is a synonym of Scirpus flaccidifolius (Fernald) Schuyler.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 263763) with original publication details: Rhodora 40: 396 1938.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:230220-2.
This name was in version 1 of The Plant List, record kew-263763, and has not been changed.