This name is a synonym of Medicago polyceratia subsp. amandiana (Samp.) Greuter & Burdet.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 13075638) with original publication details: Stud. Bot. (Salamanca) 2: 129 1983.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:922822-1.
This name was in version 1 of The Plant List, record tro-13075638.