 More recently, "Prunus" is thought to have evolved from within a much larger clade now called subfamily Amygdaloideae (incorrectly "Spiraeoideae").In 1737, Carl Linnaeus used four genera to include the species of modern "Prunus"—"Amygdalus, Cerasus, Prunus" and "Padus"—but simplified it to "Amygdalus" and "Prunus" in 1758.Since then, the various genera of Linnaeus and others have become subgenera and sections, as all the species clearly are more closely related.