The Prunus or Cherry genus
Finding out what Cherry species you are dealing with.
Determination of cherry species is next to impossible: there are more than 400 species. All are cultivated of course. It is however rather easy to discern that a tree is a cherry: the trunk has hotizontal brown shiny "ribs" of strips (see the first pic). The leafs are mostly long and slender and have "eye-lashes-like teeth". The branches are often ented on the trunk.
Here a review of the 400 species.All species photographed.
Prunus cerasifera 'Nigra'
or Cherry plum 
Sour cherry 
Leafs of photographed species.
