For seeds of Tabebuia serratifolia Vahl Nich., immersion in 0.5% tetrazolium solution for 12 hours at 30 °C is used and in seeds of Peltophorum dubium (Sprengel) Taubert, the solution concentration used is 0.1% and temperature of 25 ºC for 150 minutes of coloration (Oliveira et al., 2005a; 2005b)