In order to contribute to the knowledge of the floral biology of Chrysophyllum auratum Miq. (SAPOTACEAE) two cultivated specimens was analised in Horticulture Section of Escola Superior de Agricultura "Luiz de Queiroz", Piracicaba - SP. The survey included floral phenology and the establishment of reproductive systern. The flowers had vespertine andnocturnal anthesis and protandrie. One spicemen exhibited a phenological precocity. The pollination syndrome was miofily but no biological pollinator agents was observed. No conclusion about the reproductive system were possible with the tests.