Prunus serotina - black, rum, or American bird cherry
The black cherry, native to North America, has a conical habit with shiny dark green, narrow oval leaves. In warm autumns it turns various shades of yellow and red. The species flowers after the appearance of the foliage, a week or two after the Finnish native bird cherry, P. padus. The fruit of the black cherry is larger than the bird cherry, at first red but ripening to almost black.