The location of the ovary in relation to the other flower parts is a key feature used to identify a flower species. There are three examples given below.
The first photo shows a Superior ovary. The sepals, petals and stamens arise from below the ovary.This is the commonest type of ovary. The flower is technically Hypogynous where hypo means flower parts start ‘below’ the ovary.
The second photo shows an Inferior ovary. The tepals, corolla tube and stamens (filaments plus anthers)arise from above the ovary. The flower is technically Epigynous where epi means ‘above’