true blackberry: the true blackberry of Europe as well as any of numerous varieties having sweet edible black or dark purple berries
blackberry: bramble with sweet edible black or dark purple berries that usually do not separate from the receptacle
arecidae: one of four subclasses or superorder of Monocotyledones; comprises about 6400 species in 5 families of trees and shrubs and terrestrial herbs and a few free-floating aquatics including: Palmae; Araceae; Pandanaceae and Lemnaceae