The açaí palm (, from Tupi-Guarani asaí; Euterpe oleracea) is a species of palm tree in the genus Euterpe cultivated for its fruit and hearts of palm. Its name comes from the Brazilian Portuguese adaptation of the Tupian word ïwaca'i, '[fruit that] cries or expels water'. Global demand for the fruit has expanded rapidly in recent years, and açaí is now cultivated for that purpose primarily. Euterpe edulis (juçara) is a closely related species which is now the primary source of hearts of palm.