This name is a synonym of Monanthotaxis caesia (Diels) Verdc..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 1600682) with original publication details: Notizbl. Bot. Gart. Berlin-Dahlem 9: 345 1925.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:74787-1.
This name was in version 1 of The Plant List, record tro-1600682, and has not been changed.