Partridge-berry patches are the result of clones, a form of vegetative reproduction where all the plants are genetically identical. The flowers in a patch are all bisexual, having both male (stamens) and female (pistils) reproductive parts.
In a given clonal patch, there is only one type of flower: all flowers are either "pin" flowers (long, extended styles and much shorter, hidden stamens) or "thrum" flowers (long stamens and short pistils). The stigmas on pin flower pistils are only receptive to pollen from long stamens (thrum flowers) that necessarily come from another patch. This "self-incompatibility" reproductive structure promotes cross-pollination and is known as distyly.
If you follow the paired flowers of Partridge-berry all the way down to their base, you will see that they are joined by the fusion of their ovaries. The remnants of the sepals surrounding the base of the paired tubular flowers can be seen in the two dimples on each of the red fruits.
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