Faveira-arara-tucupi (Parkia decussata Ducke) see.ds were submited to several treatments and data coll.ected referent the germination power; the treatments were utili zαtiοη of concentrated sulfuric acid duri.ng 2,5; 5; 10; 20 and 40 minutes, manual scari fication,hot water at 80°C during 10; 20 and 40 minutes and water at environmental temper ature during 12 and 24 hours. The sulfuric acid treatments for 20 and 40 minutes and manual scarification, were the most efficient, in order to increase, the germination. According to the results the autors indicate as the probable cause of sedd germination problems the impermeability of the tegument to water.