This name is a synonym of Polyarrhena imbricata (DC.) Grau.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record E322D511-A7A5-4A48-8B58-8E8F87108422) with original publication details: 77 1865.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:181469-1.
This name was in version 1 of The Plant List, record gcc-95115, and has not been changed.