Three series comprising eight regional trials were undertaken in order to find out the behaviour and production of some recently imported strains of sunflower (Helianthus annuus L.) in three localities of the State of São Paulo during the years 1947-1949. These trials indicated that the following are the most promising strains : Riscado, La Estanzuela n.° 53, Línea-16, Línea-30, Gigante da Rússia n.° 64, and Sel. Fischer-100.