Practice question

Rosa species exemplifies perigynous condition where thalamus expands into deep cup-shaped hypanthium enclosing ovary centrally but not fused to ovary wall, sepals petals and numerous stamens borne on rim of cup, ovary superior to half-inferior depending on degree of immersion. This intermediate differs from hypogynous superior free as in mustard Hibiscus and epigynous inferior embedded as in guava sunflower. Perigyny typical of Rosaceae subfamily Rosoideae and Prunoideae, allows formation of accessory aggregate fruits where hypanthium becomes fleshy and edible, facilitating animal dispersal and varied fruit morphology across genus.