Achene
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An achene, also sometimes called akene and occasionally achenium or achenocarp, is a type of simple dry fruit produced by many species of flowering plants. Achenes are monocarpellate and indehiscent.
Cypsela of Cynara
Cypselae on a dandelion "clock" (the matured capitulum) can disperse in the wind due to the hair-like calyx tissue above each ovary.
A microscopic view of a dandelion "clock" showing the receptacle and the cypselas.
Samaras of Acer buergerianum are achenes with large wing-like structures.
Accessory fruit
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An accessory fruit is a fruit that contains tissue derived from plant parts other than the ovary. In other words, the flesh of the fruit develops not from the floral ovary, but from some adjacent tiss
Achene
…caraway, quinoa, amaranth, and cannabis are typical achenes. The achenes of the strawberry are sometimes mistaken for seeds. The strawberry is an accessory fruit with an aggregate of achenes on its outer surface, and what is eaten is accessory tissue. A rose produces an aggregate of achene fruits that are…
A selection of accessory fruits (from left to right: pear, fig, and strawberry)
Apple section, showing seeds plus papery expression of the ovary, surrounded by tissue formed from ripening of the hypanthium.
On this strawberry, the many pips located on the surface have grown into leafy structures rather than seeds in a phenomenon known as phyllody. The pips of the strawberry are its true fruit.
The cashew 'apple' and its attached drupe, which contains the edible seed.