This name is a synonym of Agarista paraguayensis (Sleumer) Judd.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50079455) with original publication details: Bot. Jahrb. Syst. 78: 465 1959.
This name was in version 1 of The Plant List, record tro-50079455, and has not been changed.