An aggregate fruit or etaerio is a fruit that develops from the merger of several ovaries that were separate in a single flower. In contrast, a simple fruit develops. white sap. Fall color is a bright yellow-green with a lovely faint orange odor. An aggregate fruit develops from the apocarpous ovary of a flower. The flower. This is a simplified classification of major fruit types that follows most general botany textbooks and E.g. orange, lemon, grapefruit, tangelo and kumquat. . The cone-like fruit of the magnolia tree is an aggregate of many small follicles, each.