This name is a synonym of Amphipterygium simplicifolium (Standl.) Cuevas-Figueroa.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Contr. U. S. Natl. Herb. 23: 673 1923.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:11604-2.
This name was in version 1 of The Plant List, record kew-2634735, and has not been changed.