This name is a synonym of Mentzelia multicaulis (Osterh.) J. Darl..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50298760) with original publication details: New Man. Bot. Centr. Rocky Mt. 326 1909.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:157509-2.
This name was in version 1 of The Plant List, record tro-50298760.