Two fairly similar-looking carpel and seed clusters. The red "berries" are seeds which aborted, or stopped developing partway through their growth; the black ones are the viable seed. Unfortuantely my camera doesn't do a good job with the red ones; they are really a bright red rather than the pinkish tone seen here.
Paeonia triternata seed and carpels.
Paeonia caucasica seed and carpels.