This name is a synonym of Diplacrum capitatum (Willd.) Boeckeler.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 338476) with original publication details: Naturaliste Canad. 91: 132 1963.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:230614-2.
This name was in version 1 of The Plant List, record kew-338476, and has not been changed.