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 13056999) with original publication details: Ann. Sci. Nat. Porto 6: 143 1900.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:523874-1.
This name was in version 1 of The Plant List, record tro-13056999.