The genus Rubus also includes raspberries. The untrained eye cannot always distinguish between a blackberry and a raspberry, since the shapes and sizes of the fruit, leaves, and thorns vary, and there are both red blackberries and black raspberries. However, when a blackberry is picked, it comes off the plant with its receptacle, the solid centre to which the druplets (the round, juicy parts) are attached. When a raspberry is picked, the cluster of druplets comes away from the receptacle, which remains as a hard, white cone on the stem. A good blackberry has druplets which are large in relation to the hard part.