in taxon grain or seed-producing plant guarana plant Guarana (*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 its fruit, which is about the size of a coffee bean. As a dietary supplement, guarana is an effective stimulant] it contains about twice the caffeine found in coffee beans (about 2 to 4.5% caffeine in guarana seeds compared to 1 to 2% for coffee beans).. PLANTS:PACU7 MANSFELD:6836 brazilian cocoa guarana paullinia cupana uabano Paullinia cupana requires discussion