This name is a synonym of Mentzelia parvifolia Urb. & Gilg ex Kurtz.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50237378) with original publication details: Bot. Jahrb. Syst. 76: 420 1955.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:157448-2.
This name was in version 1 of The Plant List, record tro-50237378, and has not been changed.