Acerola cherry

Malpighia emarginata is a tropical fruit-bearing shrub or small tree in the family Malpighiaceae. Common names include acerola , Guarani cherry, Barbados cherry, West Indian cherry, and wild crepe myrtle. Acerola is native to Paraguay and Brazil in South America, Central America and southern Mexico, Puerto Rico, Dominican Republic and Haiti, but is now also being grown as far north as Texas and in subtropical areas of Asia, such as India.

Source: Wikipedia