This name is a synonym of Mila nealeana Backeb..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 5101343) with original publication details: Neue Kakteen 83 1931.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:161360-2.
This name was in version 1 of The Plant List, record tro-5101343.