Historical reference: Do not rely on this information. It is very old. About this collection
Blackberry, the fruit of the brambles, species formerly united under the name Rubus fruticosus. It is known technically as an etaerio of drupels, consisting of a number of distinct (apocarpous) carpels, each of which is a drupel or miniature drupe, with polished skin or epicarp, fleshy mesocarp, and stone (endocarp), containing one seed, but differing from a plum in having a persistent style. The calyx and stamens also persist in the fruit stage. Blackberries are largely collected in England for puddings, jam, and jelly.