Prunoideae, also called Amygdaloideae, is the subfamily containing the genera Prunus and Prinsepia. It is placed within the Rosaceae or sometimes in its own family Prunaceae. They are often known as the stone fruit, as the fruit contains a single hard-shelled seed called a stone. Important members of the Prunoideae include the plum, cherry, apricot, peach and almond.