This name is a synonym of Xylonagra arborea (Kellogg) Donn. Sm. & Rose.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50173685) with original publication details: Proc. Calif. Acad. Sci. 2: 32–33 1863.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:172733-2.
This name was in version 1 of The Plant List, record tro-50173685, and has not been changed.