I grew up on a spacious tract of land that housed two separate types of nature-grown black berries.  One was the blackberry (left), and the other was the black raspberry (right), or black cap. 
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Blackberries are larger and much more sour than black raspberries, but because of their size, they're also juicier.  They're quite edible and useful for making desserts, jams, and wine (none of which have been made by me).  Black raspberries, also known as black caps, grow like weeds and contain a very powerful purple dye, which will stain hands and clothing for days. #food