This name is a synonym of Mostacillastrum sagittatum (Hook. & Arn.) Al-Shehbaz.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 100360365) with original publication details: Revis. Gen. Pl. 2: 935. 1891.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:120898-2.
This name was in version 1 of The Plant List, record tro-100360365.