Oedema

Radiator Plants Distribution,
Peperomia species (e.g. Radiator plant, Rat tail) are found in tropical and subtropical climates all over the world, but the genus has the most diversity in the Americas, where it can be found in a wide range of environments from the southern United States to Argentina and Chile. The Andes and Amazon regions are home to many indigenous species. Southern Asia (around 100 species), Africa (around 20 species), Madagascar (around 40 species), and Australia and New Zealand (less than 20 species) have the most diversity.