This name is a synonym of Mimosa diplotricha var. inermis (Adelb.) M.K. Alam & M. Yusof.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 100354589) with original publication details: Fl. Males. Bull. 9: 416 1987.
This name record (from Tropicos) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Mimosa diplotricha in version 1 of The Plant List.