This name is a synonym of Callistemon speciosus (Sims) Sweet.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym and as an illegitimate name (record 126421) with original publication details: Descr. Pl. Malmaison 86 1815.
This name was in version 1 of The Plant List, record kew-126421, and has not been changed.