This name is a synonym of Medicago arenicola (Hub.-Mor.) E. Small.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 13062732) with original publication details: Notes Roy. Bot. Gard. Edinburgh 29(3): 322 1969.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:523883-1.
This name was in version 1 of The Plant List, record tro-13062732.