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An aggregate fruit develops from several separate carpels of a single flower, producing a collection of individual fruit units. The number of original flowers is crucial: a multiple fruit involves several flowers, whereas an aggregate fruit starts with one.^[ref]

A strawberry makes the arrangement tangible. Its surface bears numerous achenes, each an individual dry fruit, supported by the enlarged fleshy receptacle. The familiar edible object therefore combines many fruit units with tissue outside the individual ovaries.^[ref]

For a simple counting example, a single flower with twenty separate fertile carpels could produce twenty fruit units in one aggregate if each develops successfully. The count follows the separate carpels, not twenty separate flowers. Aggregate fruit and accessory fruit consequently describe different properties: the former concerns the collection of units, while the latter concerns contributions from non-ovarian tissue.

Bromeliaceae is the flowering-plant family containing the pineapple and plants such as Tillandsia usneoides, commonly called Spanish moss. The family includes ground-growing plants and epiphytes, which grow on other plants as supports. Those different habits illustrate why a family is an evolutionary classification rather than a single way of obtaining physical support.^[ref]

The pineapple supplies a distinctive reproductive example. Its multiple fruit develops from several flowers in an inflorescence. That familiar product helps identify one family member, but it should not be converted into a claim that every member of Bromeliaceae produces a pineapple-like edible structure.^[ref]

For an illustrative classification exercise, compare a ground-grown pineapple with an epiphyte attached to a branch. Recording habitat and support alone would separate them ecologically, while floral and inherited characters can place them in the same family. Conversely, two unrelated plants growing on branches do not become close relatives simply by sharing that habit.

A multiple fruit is a collective fruiting structure derived from more than one flower in an inflorescence. The developing individual fruits and associated parts form one apparent unit. A pineapple makes the idea tangible: several floral ovaries contribute to the structure commonly handled as one fruit.^[ref]

The crucial developmental count is the number of original flowers. An aggregate fruit derives from several separate carpels of one flower; a multiple fruit involves several flowers. A large number of seeds alone establishes neither category. One ovary can contain many ovules, and a fruiting structure can develop without mature seeds.^[ref]

Imagine marking three adjacent flowers in an inflorescence and tracing their ovaries through development. If their fruiting products join a single apparent mass, the labels still record three floral origins. Cutting the mature mass into three pieces does not reverse that history: classification follows development rather than serving size.

The pineapple, Ananas comosus, is a perennial angiosperm in Bromeliaceae, cultivated for its conspicuous fleshy fruiting structure. The familiar edible object is a multiple fruit: it develops from the products of several flowers in one inflorescence, rather than from one large ovary.^{[ref] [ref]}

A useful examination starts with the repeated units on its surface. These reflect the organization of the earlier inflorescence. In the New York Botanical Garden's illustrated specimen, each flower is associated with a bract, and the floral ovary is inferior. The development of the whole mass therefore combines neighboring units and associated tissues.^[ref]

For an illustrative tracing exercise, label three adjacent flowers before fruit development and follow their contributions into the mature pineapple. They retain three floral origins even when the products become one apparent mass. This distinguishes a multiple fruit from an aggregate fruit, which starts from several separate carpels in a single flower.