This name is a synonym of Peperomia tetragona Ruiz & Pav..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 25001477) with original publication details: Enum. Pl. 1: 349 1805.
This name was in version 1 of The Plant List, record tro-25001477, and has not been changed.