Etaerio vs. Achene — What's the Difference?

(botany) An aggregate fruit of achenes, drupes, or follicles.

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).

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

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

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