A small European plum (Prunus interstitia, syn. Prunus domestica subsp. insititia).
The bully tree.
Any of various other plants of the genus Prunus, as a shrub or small tree, Prunus alleghaniensis, bearing dark-purple fruit.
The small, astringent, wild fruit of the blackthorn (Prunus spinosa).
The tree Prunus spinosa.