This name is a synonym of Casuarina equisetifolia subsp. incana (Benth.) L.A.S.Johnson.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 382559) with original publication details: Fl. Austral. 6: 197 1873.
This name was in version 1 of The Plant List, record kew-2705447, and has not been changed.