The raspberry is the edible fruit of a multitude of plant species in the fenus Rubus of the rose family, most of which are in the subgenus Idaeobatus.
A raspberry is an aggregate fruit, developing from the numerous distinct carpels of a single flower. What distinguishes the raspberry from its blackberry relatives is whether or not the torus (receptacle or stem) “picks with” (i.e., stays with) the fruit. When picking a blackberry fruit, the torus stays with the fruit. With a raspberry, the torus remains on the plant, leaving a hollow core in the raspberry fruit.