Studies about macadâmia flowering were carried under conditions of Jaboticabal, State of São Paulo, Brazil (latitude 21º 15'S, longitude 48º 18'W) from May 1993 to October 1995 using six years old plants of cultivar IAC 5-10 and IAC 8-17 selected by Instituto Agronômico de Campinas (IAC). There are three buds in the axis leaf but only on the upper and median form inflorescences. It was observed that floral buds born principally on thin branches ( diameter between 0.2 and 0.7 cm) and in a period of 48 and 55 days or 330 and 350 degree days (base temperature = 12.8 ºC) from initial buds to anthesis. Inflorescence and flower + pedicel presented sigmoid development. Initial period of flowering (white buds) occurred during May and anthesis occurred principally from August to September.
physiology; cultivar; degree day; development
