This name is a synonym of Mimosa albida var. willdenowii (Poir.) Rudd.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 13047075) with original publication details: Proc. Amer. Acad. Arts 33(17): 311 1898.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:161475-2.
This name was in version 1 of The Plant List, record tro-13047075.