The açaí palm

The açaí palm (IPA: /asaˈi/) is a member of the genus Euterpe, which contains 7 species of palms native to tropical Central and South America, from Belize south to Brazil and Peru, growing mainly in floodplains and swamps.

The genus is named after the muse Euterpe of Greek mythology. Euterpe are tall, slender palms growing to 15–30 meters, with pinnate leaves up to 3 meters long. Many of the palms that were once in the genus Euterpe have been reclassified into the genus Prestoea (Riffle, 2003). The species Euterpe oleracea is usually called Açaí Palm, after the European derivation of the Tupian word ïwasa'i, 'fruit that cries or expels water'.
Heart of palm, the soft inner growing tip of some palms (Euterpe edulis, Euterpe oleracea, Bactris gasipaes), is often consumed in salads.
Acai berry has 15-20 times the antioxidants (anthocyanins) that red grapes have.