Prunus cerasus, or the sour cherry, is a species of Prunus in the subgenus Cerasus (cherries), native to much of Europe and southwest Asia. It is closely related to the wild cherry (P. avium), but has a fruit that is more acidic.
The tree is smaller than the wild cherry (growing to a height of 4–10 m), has twiggy branches, and its crimson-to-near-black cherries are borne upon shorter stalks.
There are two varieties of the sour cherry: the dark-red morello cherry and the lighter-red amarelle cherry.
Read more about Prunus Cerasus: Origins and Cultivation