However, in Rubus each carpel develops into a small drupe (drupelet), with the mesocarp becoming fleshy and the endocarp becoming hard and forming a tiny pit that encloses a single seed. Since there are many carpels per flower, there are many drupelets, and the "fruit" of a blackberry or raspberry is really an aggregate fruit of drupelets (no accessory tissue is involved).

Photos by K. R. Robertson, the one on the left at Richardson Wildlife Foundation, Lee County, Illinois, the one on the right of cultivated red raspberries picked at a local berry farm.

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