Fruits of <i><a href="//commons.wikimedia.org/wiki/Dodonaea_viscosa" title="Dodonaea viscosa">Dodonaea viscosa</a></i> (<i><a href="//commons.wikimedia.org/wiki/Sapindaceae" class="mw-redirect" title="Sapindaceae">Sapindaceae</a></i>), capsules formed from uncompletely merged winged carpels (here 2x, but also 3x or  sometimes 4x)
<a href="//commons.wikimedia.org/wiki/User:B.navez" title="User:B.navez">B.navez</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>