Compare the above fruit with the fruit of Vaccinium praestans on the right and you should see a number of differences. Firstly Vacciniums are berries where the seed is fully enclosed and encased in the fleshy body: also notice the scar left by the base of the corona (flower) on the red vaccinium berry this tells us that this plant has an inferior ovary. That is; the ovary is not contained within the flower but sits “below it” - between the corolla and the stem. The opposite is the case with the Gaultheria fruits where you saw the seedpod was in front of and surrounded by the swollen calyx- as it had been by the flower – so these plants have a superior ovary. These are important diagnostic features used in the taxonomy of plants.
Trillium erectum hybrid seed pod