Achene

An achene (/əˈkiːn/;[1] from Ancient Greek ἀ (a) 'privative' and χαίνειν (khaínein) 'to gape'),[2] also sometimes called akene and occasionally achenium or achenocarp, is a type of simple dry fruit produced by many species of flowering plants.

[2] The fruits of buttercup, buckwheat, caraway, quinoa, amaranth, and cannabis are typical achenes.

Some achenes have accessory hair-like structures that cause them to tumble in the wind in a manner similar to a tumbleweed.

The fruit of the family Asteraceae is also so similar to an achene that it is often considered to be one, although it derives from a compound inferior ovary (with one locule).

[clarification needed] Many cypselas (e.g. dandelion) have modified calyx tissue called pappi attached that functions in biological dispersal of the seed.