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.
Traditionally it has been divided into 4 subfamilies (Rosoideae, Spiraeoideae, Maloideae or Pomoideae, and Amygdaloideae or Prunoideae), primarily diagnosed by the structure of the fruits, but this has not been universally followed.
To these are added the woody genera Lindleya and Vauquelinia, which share a haploid chromosome count of 17 (x=17) with the pomiferous genera, Kageneckia, in which x=15, and the herbaceous genus Gillenia (x=9), which is the sibling to the remaining maloids.
Subfamily Amygdaloideae (or Prunoideae): Traditionally those genera whose fruits consist of a single drupe with a seam, two veins next to the seam, and one vein opposite the seam.
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