The dewberries are a group of species in the genus Rubus, section Rubus, closely related to the blackberries. They are small trailing (rather than upright or high-arching) brambles with aggregate fruits, reminiscent of the raspberry, but are usually purple to black instead of red. Unlike many other Rubus species, dewberries are dioecious, having separate male and female plants.

What's the best answer to this question: is a dewberry the same as a blackberry?
no