Guarana (/ˌɡwɑrəˈnɑː/, from the Portuguese guaraná [ɡwaɾɐˈna]), Paullinia cupana, syn. P. crysan, P. sorbilis) is a climbing plant in the maple family, Sapindaceae, native to the Amazon basin and especially common in Brazil. Guarana features large leaves and clusters of flowers, and is best known for the seeds from its fruit, which are about the size of a coffee bean.