Achene
An achene (; from Ancient Greek ἀ (a) 'privative' and χαίνειν (khaínein) '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).