In Australia three species of Myristica are recognized: M. muelleri Warb., M. insipida R. Br. and one species, M. ampliata de Wilde, newly described here; the specimen Lucas (& Wilson) 10, possibly representing a fourth taxon, of unknown status, is discussed under M. insipida. Presented are a key to the species, an enumeration of species with notes, and a brief discussion of characters, relationships, and distribution.