Begonia acetosa

About

Begonia acetosa is a species of flowering plant in the family Begoniaceae, native to southeastern Brazil. It is used to create new begonia hybrids due to its attractive foliage. Begonia acetosa has been cultivated in the United States since 1946, when Mulford B. Foster introduced the species from forested mountains near Rio de Janeiro. It was first described in 1831 by José Mariano de Conceição Vellozo. The specific epithet acetosa means 'acid' or 'sour', referring to the rhubarb-like taste of its leaves.

Summary from Wikipedia