Achene vs. Cypsela — What's the Difference?

An achene (; Greek ἀ, a, privative + χαίνειν, chainein, to gape; 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 (formed from one carpel) and indehiscent (they do not open at maturity).

An achene fruit derived from an inferior ovary, characteristic of plants in the composite family.

A small, dry, indehiscent one-seeded fruit with a thin wall, as in a sunflower.

(botany) An achene formed from an inferior bicarpellary ovary of which only one carpel develops into a seed, as in plants of the family Compositae.

(botany) A small, dry, indehiscent fruit, containing a single seed, as in the buttercup.

A one-seeded, one-celled, indehiscent fruit; an achene with the calyx tube adherent.

A small, dry, indehiscent fruit, containing a single seed, as in the buttercup; - called a naked seed by the earlier botanists.

Small dry indehiscent fruit with the seed distinct from the fruit wall