Not to be considered as synonym of Peperomia alata Ruiz & Pav. as was published by Burger, 1971: 17. Peperomia pilulifera differs in the leaf-opposed spadices. Not to be considered as synonym of Peperomia glabella (Sw.) A.Dietr. either (l.c. 37)., which shows leaves with black glandular dots at both sided [Mathieu, 2007, pers. comm.]