This name is a synonym of Mentzelia nitens Greene.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 18900202) with original publication details: Phytologia 21(4): 279–280 1971.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:545382-1.
This name was in version 1 of The Plant List, record tro-18900202.