This name is a synonym of Monanthotaxis chasei (N. Robson) Verdc..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 1602445) with original publication details: Bol. Soc. Brot., sér. 2, 32: 155 1958.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:74794-1.
This name was in version 1 of The Plant List, record tro-1602445, and has not been changed.